0000950170-24-012680 | 10-Q | XBRL Viewer

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Income Tax - Effective Tax Rate (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
(Provision) benefit for income taxes	$ (34)	$ (20)
Effective tax rate	36.00%	24.00%

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Restructuring

3 Months Ended

Dec. 31, 2023

Restructuring and Related Activities [Abstract]

Restructuring

H. Restructuring

2024 Reorganizations

During the first quarter of fiscal 2024, the Company initiated restructuring activities in both its Reinforcement Materials segment (“RM Plan”) and its Performance Chemicals segment (“PC Plan”).

Under the RM Plan, the Company will close its reinforcing carbons unit at the facility in Tianjin, China that the Company acquired from Tokai Carbon Group in February 2022. The Company expects to consolidate reinforcing carbons operations and reduce ongoing operational costs. During the three months ended December 31, 2023, the Company recorded charges of $2 million for severance related costs and $6 million for accelerated depreciation as part of the RM Plan. The Company expects to record additional restructuring charges of $1 million related to the RM Plan during the remainder of fiscal 2024.

Under the PC Plan, the Company will temporarily idle its aerogel manufacturing plant in Frankfurt, Germany and reorganize certain positions within the Performance Chemicals segment to reduce operating costs. While the Frankfurt facility is idled, the Company expects to reduce inventory levels at that facility as the Company continues its efforts to commercialize aerogel for use in thermal insulation for electric vehicles. During the three months ended December 31, 2023, the Company recorded charges of $1 million for severance related costs as part of the PC Plan. The Company expects to record additional restructuring charges of $3 million related to the PC Plan during the remainder of fiscal 2024.

Cabot’s restructuring activities were recorded in the Consolidated Statements of Operations for the three months ended December 31, 2023 and 2022 as follows:


	Three Months Ended December 31
	2023		2022
	(In millions)
Cost of sales	$	9	$	—
Total	$	9	$	—

Details of all restructuring activities and the related reserves during the three months ended December 31, 2023 were as follows:


	Severance and Employee Benefits			Accelerated Depreciation on Assets			Total
	(In millions)
Reserve at September 30, 2023	$	—		$	—		$	—
Charges		3			6			9
Cost charged against assets		—			(6	)		(6	)
Cash paid		(1	)		—			(1	)
Reserve at December 31, 2023	$	2		$	—		$	2

Cabot’s severance and employee benefit reserves are reflected in Accounts payable and accrued liabilities on the Company’s Consolidated Balance Sheets.

Earnings Per Share - Calculation of Undistributed Earnings (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net income (loss) attributable to Cabot Corporation	$ 50	$ 54
Less: Dividends declared on common stock	22	21
Undistributed earnings (loss)	28	33
Undistributed earnings (loss) allocated to common shareholders	27	32
Undistributed earnings allocated to participating shareholders	$ 1	$ 1

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

Financial Instruments and Fair Value Measurements

3 Months Ended

Dec. 31, 2023

Fair Value Disclosures [Abstract]

Financial Instruments and Fair Value Measurements

I. Financial Instruments and Fair Value Measurements

The FASB authoritative guidance on fair value measurements defines fair value, provides a framework for measuring fair value, and requires certain disclosures about fair value measurements. The required disclosures focus on the inputs used to measure fair value. The guidance establishes the following hierarchy for categorizing these inputs:


Level 1	—	Quoted market prices in active markets for identical assets or liabilities

Level 2	—	Significant other observable inputs (e.g., quoted prices for similar items in active markets, quoted prices for identical or similar items in markets that are not active, inputs other than quoted prices that are observable such as interest rate and yield curves, and market-corroborated inputs)

Level 3	—	Significant unobservable inputs

There were no transfers of financial assets or liabilities measured at fair value between Level 1 and Level 2 and there were no Level 3 investments during the first three months of either fiscal 2024 or 2023.

At December 31, 2023 and September 30, 2023, the fair values of cash and cash equivalents, accounts and notes receivable, accounts payable and accrued liabilities, and short-term borrowings and variable rate debt approximated their carrying values due to the short-term nature of these instruments. Cash and cash equivalents are classified as Level 1 within the fair value hierarchy.

At December 31, 2023 and September 30, 2023, Cabot had derivatives relating to foreign currency risks, including a net investment hedge and forward foreign currency contracts, carried at fair value. At December 31, 2023 the fair value of these derivatives was a net asset of $4 million and was included in Prepaid expenses and other current assets, Accounts payable and accrued liabilities, and Other assets on the Consolidated Balance Sheets. At September 30, 2023, the fair value of these derivatives was an asset of $12 million and was included in Prepaid expenses and other current assets and Other assets on the Consolidated Balance Sheets. These derivatives are classified as Level 2 instruments within the fair value hierarchy as the fair value determination was based on observable inputs.

At December 31, 2023 and September 30, 2023, the fair value of guaranteed investment contracts included in Other assets on the Consolidated Balance Sheets was $9 million and $8 million, respectively. Guaranteed investment contracts were classified as Level 2 instruments within the fair value hierarchy as the fair value determination was based on other observable inputs.

The carrying value and fair value of the long-term fixed rate debt were $1.09 billion and $1.08 billion, respectively, as of December 31, 2023 and 1.08 billion and 1.04 billion, respectively, as of September 30, 2023. The fair values of Cabot’s fixed rate long-term debt are estimated based on comparable quoted market prices at the respective period ends. The carrying amounts of Cabot’s floating rate long-term debt and finance and operating lease obligations approximate their fair values. All such measurements are based on observable inputs and are classified as Level 2 within the fair value hierarchy. The valuation technique used is the discounted cash flow model.

Earnings Per Share (Tables)

3 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Components of Basic and Diluted Earnings (Loss) Per Common Share (EPS)

The following tables summarize the components of the basic and diluted earnings (loss) per common share (“EPS”) computations:


	Three Months Ended December 31
	2023		2022
	(In millions, except per share amounts)
Basic EPS:
Net income (loss) attributable to Cabot Corporation	$	50	$	54
Less: Dividends and dividend equivalents to participating securities		—		—
Less: Undistributed earnings allocated to participating securities(1)		1		1
Earnings (loss) allocated to common stockholders (numerator)	$	49	$	53

Weighted average common shares and participating securities outstanding		56.4		57.6
Less: Participating securities(1)		1.1		1.3
Adjusted weighted average common shares (denominator)		55.3		56.3

Earnings (loss) per common share - basic:	$	0.88	$	0.94

Diluted EPS:
Earnings (loss) allocated to common stockholders	$	49	$	53
Plus: Earnings allocated to participating securities		1		1
Less: Adjusted earnings allocated to participating securities(2)		1		1
Earnings (loss) allocated to common stockholders (numerator)	$	49	$	53

Adjusted weighted average common shares outstanding		55.3		56.3
Effect of dilutive securities:
Common shares issuable(3)		0.5		0.4
Adjusted weighted average common shares (denominator)		55.8		56.7

Earnings (loss) per common share - diluted:	$	0.88	$	0.93

(1)

Participating securities consist of shares underlying unvested time-based restricted stock units (the "TSUs"), earned and unvested performance-based restricted stock units (the "PSUs", and referred to in this note collectively with the TSUs as the "RSUs"), stock units accounted for under the Supplemental 401(k) Plan portion of the Company’s Deferred Compensation and Supplemental Retirement Plan, and stock units and phantom stock units accounted for under the Company’s Non-Employee Directors’ Deferral Plan. The holders of RSUs are entitled to receive dividend equivalents, payable in cash, to the extent dividends are paid on the outstanding shares of Common Stock, and equal in value to the dividends that would have been paid in respect of the Common Stock underlying the RSU. The accounts of holders of stock units and phantom stock units are credited with dividend equivalents, which are payable, in stock or cash, as the case may be, with the distribution of account balances.

Calculation of Undistributed Earnings

Undistributed earnings are the earnings which remain after dividends declared during the period are assumed to be distributed to the common and participating stockholders. Undistributed earnings are allocated to common and participating stockholders on the same basis as dividend distributions. The calculation of undistributed earnings is as follows:


	Three Months Ended December 31
	2023		2022
	(In millions)
Calculation of undistributed earnings (loss):
Net income (loss) attributable to Cabot Corporation	$	50	$	54
Less: Dividends declared on common stock		22		21
Less: Dividends declared on participating securities		—		—
Undistributed earnings (loss)	$	28	$	33

Allocation of undistributed earnings (loss):
Undistributed earnings (loss) allocated to common stockholders	$	27	$	32
Undistributed earnings allocated to participating stockholders		1		1
Undistributed earnings (loss)	$	28	$	33

(2)

Undistributed earnings are adjusted for the assumed distribution of dividends to the dilutive securities, which are described in (3) below, and then reallocated to participating securities.

(3)

Represents incremental shares of common stock from the assumed exercise of stock options issued under Cabot’s equity incentive plans. For the three months ended December 31, 2023 and 2022, 330,331 and 86,782 incremental shares of common stock, respectively, were excluded from the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive.

Financial Information by Segment - Additional Information (Detail)	3 Months Ended
	Dec. 31, 2023 Segment
Segment Reporting Information [Line Items]
Number of business reportable segments	2

Restructuring - Recorded Restructuring Activities (Details) $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($)
Restructuring Cost and Reserve [Line Items]
Total	$ 9
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Total	$ 9

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Financial Information by Segment - Financial Information by Reportable Segment (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues from external customers	$ 958	$ 965

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

+ Details

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash Flows from Operating Activities:
Net income (loss)	$ 61	$ 66
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	41	35
Loss on sale of business		3
Gain on sale of land		(1)
Deferred tax provision (benefit)	7
Equity in earnings of affiliated companies	(1)	(2)
Share-based compensation	6	6
Other non-cash (income) expense	37	(4)
Cash dividends received from equity affiliates	1	2
Changes in assets and liabilities:
Accounts and notes receivable	(7)	80
Inventories	(19)	(14)
Prepaid expenses and other assets	(2)	(12)
Accounts payable and accrued liabilities	(20)	(100)
Income taxes payable	(10)	(10)
Other liabilities	11	3
Cash provided by (used in) operating activities	105	52
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(54)	(35)
Proceeds from sale of land		7
Proceeds from sale of business		6
Other		5
Cash provided by (used in) investing activities	(54)	(17)
Cash Flows from Financing Activities:
Proceeds from short-term borrowings		11
Proceeds from issuance (repayments) of commercial paper, net	32	(48)
Repayments of long-term debt	(1)	(6)
Purchases of common stock	(33)	(17)
Proceeds from sales of common stock	7	3
Cash dividends paid to noncontrolling interests	(12)	(14)
Cash dividends paid to common stockholders	(22)	(21)
Cash provided by (used in) financing activities	(29)	(92)
Effects of exchange rate changes on cash	(16)	41
Increase (decrease) in cash and cash equivalents	6	(16)
Cash and cash equivalents at beginning of period	238	206
Cash and cash equivalents at end of period	$ 244	$ 190

Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($)	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, liabilities, Level 2 to Level 1 transfers, amount	$ 0	$ 0
Fair value, assets, Level 2 to Level 1 transfers, amount	0	0
Fair value, liabilities, Level 1 to Level 2 transfers, amount	0	0
Fair value, assets, Level 1 to Level 2 transfers, amount	0	0
Fair value, assets, transfers into Level 3, amount	0	0
Fair value, assets, transfers out of Level 3, amount	0	0
Fair value, liabilities, transfers into Level 3, amount	0	0
Fair value, liabilities, transfers out of Level 3, amount	0	$ 0
Fixed Rate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of long-term debt	1,090,000,000.00		$ 1,080,000,000.00
Fair value of long-term debt	1,080,000,000.00		1,040,000,000.00
Foreign Currency Risks [Member] \| Prepaid Expenses and Other Current Assets Accounts Payable and Accrued Liabilities and Other Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets (liabilities), at fair Value	4,000,000		12,000,000
Significant Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets in the Consolidated Balance Sheets	$ 9,000,000		$ 8,000,000

Income Tax

3 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Income Tax

F. Income Tax

Effective Tax Rate


	Three Months Ended December 31
	2023			2022
	(Dollars in millions)
(Provision) benefit for income taxes	$	(34	)	$	(20	)
Effective tax rate		36	%		24	%

For the three months ended December 31, 2023 and 2022, the (Provision) benefit for income taxes included a net discrete tax expense of $7 million and $3 million, respectively.

Income tax in Interim Periods

The Company records its tax provision or benefit on an interim basis using an estimated annual effective tax rate. This rate is applied to the current period ordinary income or loss to determine the income tax provision or benefit allocated to the interim period. The income tax effects of unusual or infrequent items are excluded from the estimated annual effective tax rate and are recognized in the impacted interim period. Losses from jurisdictions for which no benefit can be recognized are excluded from the overall computations of the estimated annual effective tax rate and a separate estimated annual effective tax rate is computed and applied to ordinary income or loss in the loss jurisdiction.

Valuation allowances are provided against the future tax benefits that arise from the deferred tax assets in jurisdictions for which the Company expects that no benefit can be recognized. The estimated annual effective tax rate may be significantly impacted by nondeductible expenses and the Company’s projected earnings mix by tax jurisdiction. Adjustments to the estimated annual effective income tax rate are recognized in the period when such estimates are revised.

Uncertainties

Cabot and certain subsidiaries are under audit in a number of jurisdictions. In addition, certain statutes of limitations are scheduled to expire in the near future. It is reasonably possible that a change in the unrecognized tax benefits may also occur within the next twelve months related to the settlement of one or more of these audits or the lapse of applicable statutes of limitations. However, an estimated range of the impact on the unrecognized tax benefits cannot be quantified at this time.

Cabot files U.S. federal and state and non-U.S. income tax returns in jurisdictions with varying statutes of limitations. The 2020 through 2022 tax years generally remain subject to examination by the IRS and various tax years from 2016 through 2022 remain subject to examination by the respective state tax authorities. In foreign jurisdictions, various tax years from 2006 through 2022 remain subject to examination by their respective tax authorities.

During each of the three months ended December 31, 2023 and 2022, Cabot released uncertain tax positions of $1 million due to the expiration of statutes of limitations in various jurisdictions.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//740/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-14

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-21

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482526/740-270-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-17

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482603/740-30-50-2

+ Details

Restructuring - Restructuring Activities and Related Reserves (Details) $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($)
Restructuring Cost and Reserve [Line Items]
Reserve balance	$ 0
Charges	9
Cost charged against assets	(6)
Cash paid	(1)
Reserve balance	2
Severance and Employee Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance	0
Charges	3
Cash paid	(1)
Reserve balance	2
Accelerated Depreciation on Assets [Member]
Restructuring Cost and Reserve [Line Items]
Reserve balance	0
Charges, Accelerated depreciation on assets	6
Cost charged against assets	$ (6)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Income Tax (Tables)

3 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Effective Tax Rate


	Three Months Ended December 31
	2023			2022
	(Dollars in millions)
(Provision) benefit for income taxes	$	(34	)	$	(20	)
Effective tax rate		36	%		24	%

Financial Information by Segment - Financial Information by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues from external customers	$ 958	$ 965
Income (loss) before income taxes	94	84
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	926	929
Income (loss) before income taxes	163	123
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	32	36
Income (loss) before income taxes	(69)	(39)
Reinforcement Materials [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	641	643
Income (loss) before income taxes	129	94
Performance Chemicals [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	285	286
Income (loss) before income taxes	$ 34	$ 29

- Definition

+ References

+ Details

Accumulated Other Comprehensive Income (Loss) ("AOCI")

3 Months Ended

Dec. 31, 2023

Stockholders' Equity Note [Abstract]

Accumulated Other Comprehensive Income (Loss) ("AOCI")

D. Accumulated Other Comprehensive Income (Loss) (“AOCI”)

Comprehensive income combines net income (loss) and other comprehensive income items, which are reported as components of stockholders’ equity in the accompanying Consolidated Balance Sheets.

Changes in each component of AOCI, net of tax, were as follows:


	Currency Translation Adjustment			Pension and Other Postretirement Benefit Liability Adjustments			Total
	(In millions)
Balance at September 30, 2023, attributable to Cabot Corporation	$	(353	)	$	(9	)	$	(362	)
Other comprehensive income (loss) before reclassifications		62			—			62
Amounts reclassified from AOCI		(1	)		—			(1	)
Less: Other comprehensive income (loss) attributable to noncontrolling interests		4			—			4
Balance at December 31, 2023, attributable to Cabot Corporation	$	(296	)	$	(9	)	$	(305	)


	Currency Translation Adjustment			Pension and Other Postretirement Benefit Liability Adjustments			Total
	(In millions)
Balance at September 30, 2022, attributable to Cabot Corporation	$	(429	)	$	(10	)	$	(439	)
Other comprehensive income (loss) before reclassifications		88			—			88
Amounts reclassified from AOCI		(1	)		—			(1	)
Less: Other comprehensive income (loss) attributable to noncontrolling interests		6			—			6
Balance at December 31, 2022, attributable to Cabot Corporation	$	(348	)	$	(10	)	$	(358	)

For both the three months ended December 31, 2023 and 2022, the Company reclassified $1 million of gain associated with net investment hedges out of AOCI and into interest expense on the Consolidated Statements of Operations.

Earnings Per Share

3 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Earnings Per Share

G. Earnings Per Share

The following tables summarize the components of the basic and diluted earnings (loss) per common share (“EPS”) computations:


	Three Months Ended December 31
	2023		2022
	(In millions, except per share amounts)
Basic EPS:
Net income (loss) attributable to Cabot Corporation	$	50	$	54
Less: Dividends and dividend equivalents to participating securities		—		—
Less: Undistributed earnings allocated to participating securities(1)		1		1
Earnings (loss) allocated to common stockholders (numerator)	$	49	$	53

Weighted average common shares and participating securities outstanding		56.4		57.6
Less: Participating securities(1)		1.1		1.3
Adjusted weighted average common shares (denominator)		55.3		56.3

Earnings (loss) per common share - basic:	$	0.88	$	0.94

Diluted EPS:
Earnings (loss) allocated to common stockholders	$	49	$	53
Plus: Earnings allocated to participating securities		1		1
Less: Adjusted earnings allocated to participating securities(2)		1		1
Earnings (loss) allocated to common stockholders (numerator)	$	49	$	53

Adjusted weighted average common shares outstanding		55.3		56.3
Effect of dilutive securities:
Common shares issuable(3)		0.5		0.4
Adjusted weighted average common shares (denominator)		55.8		56.7

Earnings (loss) per common share - diluted:	$	0.88	$	0.93

(1)


	Three Months Ended December 31
	2023		2022
	(In millions)
Calculation of undistributed earnings (loss):
Net income (loss) attributable to Cabot Corporation	$	50	$	54
Less: Dividends declared on common stock		22		21
Less: Dividends declared on participating securities		—		—
Undistributed earnings (loss)	$	28	$	33

Allocation of undistributed earnings (loss):
Undistributed earnings (loss) allocated to common stockholders	$	27	$	32
Undistributed earnings allocated to participating stockholders		1		1
Undistributed earnings (loss)	$	28	$	33

(2)

Undistributed earnings are adjusted for the assumed distribution of dividends to the dilutive securities, which are described in (3) below, and then reallocated to participating securities.

(3)

Earnings Per Share - Components of Basic and Diluted Earnings (Loss) Per Common Share (EPS) (Parenthetical) (Detail) - shares	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share	330,331	86,782

Accumulated Other Comprehensive Income (Loss) ("AOCI") - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Equity [Abstract]
Gain associated with the net investment hedges out of AOCI	$ 1	$ 1

Supplier Financing Programs

3 Months Ended

Dec. 31, 2023

Payables and Accruals [Abstract]

Supplier Financing Programs

J. Supplier Financing Programs

The Company maintains supply chain finance agreements with third-party financial institutions. These agreements allow the Company’s participating suppliers to sell their receivables to such third-party financial institutions to receive payment earlier than the negotiated commercial terms between the supplier and the Company. Such sales are at the sole discretion of the supplier, and on terms and conditions that are negotiated between the supplier and the respective financial institution. The terms and conditions of the supplier invoice, including payment terms and amounts due, are not impacted by a supplier’s participation in the program. Pursuant to the supply chain finance agreements, the Company has agreed to pay financial institutions on the original due date of the applicable invoice. There are no guarantees associated with these programs. The Company's outstanding payment obligations to

financial institutions related to supplier financing programs were $17 million at both December 31, 2023 and September 30, 2023 and are included within Accounts payable and accrued liabilities on the Consolidated Balance Sheets.

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Stockholders' Equity [Abstract]
Common stock, cash dividends paid, per share	$ 0.40	$ 0.37

Accumulated Other Comprehensive Income (Loss) ("AOCI") (Tables)

3 Months Ended

Dec. 31, 2023

Equity [Abstract]

Changes in Each Component of AOCI, Net of Tax

Changes in each component of AOCI, net of tax, were as follows:


	Currency Translation Adjustment			Pension and Other Postretirement Benefit Liability Adjustments			Total
	(In millions)
Balance at September 30, 2023, attributable to Cabot Corporation	$	(353	)	$	(9	)	$	(362	)
Other comprehensive income (loss) before reclassifications		62			—			62
Amounts reclassified from AOCI		(1	)		—			(1	)
Less: Other comprehensive income (loss) attributable to noncontrolling interests		4			—			4
Balance at December 31, 2023, attributable to Cabot Corporation	$	(296	)	$	(9	)	$	(305	)


	Currency Translation Adjustment			Pension and Other Postretirement Benefit Liability Adjustments			Total
	(In millions)
Balance at September 30, 2022, attributable to Cabot Corporation	$	(429	)	$	(10	)	$	(439	)
Other comprehensive income (loss) before reclassifications		88			—			88
Amounts reclassified from AOCI		(1	)		—			(1	)
Less: Other comprehensive income (loss) attributable to noncontrolling interests		6			—			6
Balance at December 31, 2022, attributable to Cabot Corporation	$	(348	)	$	(10	)	$	(358	)

Basis of Presentation

3 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Basis of Presentation

A. Basis of Presentation

The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“U.S.”) (“GAAP”) and include the accounts of Cabot Corporation (“Cabot” or the “Company”) and its wholly-owned subsidiaries and majority-owned and controlled U.S. and non-U.S. subsidiaries. Additionally, Cabot considers consolidation of entities over which control is achieved through means other than voting rights. Intercompany transactions have been eliminated in consolidation.

The unaudited consolidated financial statements have been prepared in accordance with the requirements of Form 10-Q and consequently do not include all disclosures required by Form 10-K. Additional information may be obtained by referring to Cabot’s Annual Report on Form 10-K for its fiscal year ended September 30, 2023 (the “2023 10-K”).

The financial information submitted herewith is unaudited and reflects all adjustments which are, in the opinion of management, necessary to provide a fair statement of the results for the interim periods ended December 31, 2023 and 2022. All such adjustments are of a normal recurring nature. The results for interim periods are not necessarily indicative of the results to be expected for the fiscal year.

Goodwill and Intangible Assets (Tables)

3 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Balances

The carrying amount of goodwill attributable to each reportable segment and the changes in those balances during the three months ended December 31, 2023 are as follows:


	Reinforcement Materials		Performance Chemicals		Total
	(In millions)
Balance at September 30, 2023	$	51	$	83	$	134
Foreign currency impact		2		2		4
Balance at December 31, 2023	$	53	$	85	$	138

Schedule of Intangible Assets

The following table provides information regarding the Company’s intangible assets:


	December 31, 2023							September 30, 2023
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(In millions)
Intangible assets with finite lives
Developed technologies	$	35	$	(11	)		24	$	34	$	(10	)	$	24
Trademarks		2		(1	)		1		2		(1	)		1
Customer relationships		67		(31	)		36		65		(30	)		35
Total intangible assets	$	104	$	(43	)	$	61	$	101	$	(41	)	$	60

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
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-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
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-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1A

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-2

+ Details

Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	$ 104	$ 101
Accumulated Amortization	(43)	(41)
Net Intangible Assets, finite lives	61	60
Developed Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	35	34
Accumulated Amortization	(11)	(10)
Net Intangible Assets, finite lives	24	24
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	2	2
Accumulated Amortization	(1)	(1)
Net Intangible Assets, finite lives	1	1
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	67	65
Accumulated Amortization	(31)	(30)
Net Intangible Assets, finite lives	$ 36	$ 35

Financial Information by Segment (Tables)

3 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Financial Information by Reportable Segment

Financial information by reportable segment is as follows:


	Reinforcement Materials		Performance Chemicals		Segment Total		Unallocated and Other(1)			Consolidated Total
	(In millions)
Three Months Ended December 31, 2023
Revenues from external customers(2)	$	641	$	285	$	926	$	32		$	958
Income (loss) before income taxes(3)	$	129	$	34	$	163	$	(69	)	$	94

Three Months Ended December 31, 2022
Revenues from external customers(2)	$	643	$	286	$	929	$	36		$	965
Income (loss) before income taxes(3)	$	94	$	29	$	123	$	(39	)	$	84

(1)

Unallocated and Other includes certain items and eliminations necessary to reflect management’s reporting of operating segment results. These items are reflective of the segment reporting presented to the CODM.

(2)

Consolidated Total Revenues from external customers reconciles to Net sales and other operating revenues on the Consolidated Statements of Operations. Revenues from external customers that are categorized as Unallocated and Other reflects external shipping and handling fees, royalties, the impact of unearned revenue, discounting charges for certain Notes receivable, and other by-product revenue. Details are provided in the table below:


	Three Months Ended December 31
	2023		2022
	(In millions)
Shipping and handling fees	$	30	$	33
Other		2		3
Total	$	32	$	36

(3)

Consolidated Total Income (loss) before income taxes reconciles to Income (loss) before income taxes and equity in earnings of affiliated companies on the Consolidated Statements of Operations. Income (loss) before income taxes that are categorized as Unallocated and Other includes:


	Three Months Ended December 31
	2023			2022
	(In millions)
Interest expense	$	(22	)	$	(22	)
Certain items(a)
Argentina controlled currency devaluation loss (Note B)		(33	)		—
Global restructuring activities (Note H)		(9	)		—
Gain on sale of land		—			1
Loss on sale of business		—			(3	)
Legal and environmental matters and reserves		—			(1	)
Acquisition and integration-related charges		—			(1	)
Total certain items		(42	)		(4	)
Unallocated corporate costs(b)		(17	)		(15	)
General unallocated income (expense)(c)		13			4
Less: Equity in earnings of affiliated companies, net of tax(d)		1			2
Total	$	(69	)	$	(39	)

(a)

Certain items are items of expense and income that management does not consider representative of the Company’s fundamental on-going segment results and they are, therefore, excluded from Segment EBIT.

(b)

Unallocated corporate costs are costs that are not controlled by the segments and primarily benefit corporate interests.

(c)

General unallocated income (expense) consists of gains (losses) arising from foreign currency transactions, net of other foreign currency risk management activities, Interest and dividend income, the profit or loss related to the corporate adjustment for unearned revenue and unrealized holding gains (losses) for investments. This does not include items of income or expense that are separately treated as Certain items.

(d)

Equity in earnings of affiliated companies, net of tax, is included in Segment EBIT and is removed in Unallocated and other to reconcile to Income (loss) from operations before income taxes and equity in earnings from affiliated companies.

Revenues from External Customers by Geographic Region

The Company’s segments operate globally. In addition to presenting Revenue from external customers by reportable segment, the following tables further disaggregate Revenues from external customers by geographic region.


	Three Months Ended December 31, 2023
	Reinforcement Materials		Performance Chemicals		Consolidated Total
	(In millions)
Americas	$	254	$	88	$	342
Asia Pacific		260		120		380
Europe, Middle East and Africa		127		77		204
Segment revenues from external customers		641		285		926
Unallocated and other						32
Net sales and other operating revenues					$	958


	Three Months Ended December 31, 2022
	Reinforcement Materials		Performance Chemicals		Consolidated Total
	(In millions)
Americas	$	241	$	89	$	330
Asia Pacific		273		126		399
Europe, Middle East and Africa		129		71		200
Segment revenues from external customers		643		286		929
Unallocated and other						36
Net sales and other operating revenues					$	965

Restructuring (Tables)

3 Months Ended

Dec. 31, 2023

Restructuring and Related Activities [Abstract]

Recorded Restructuring Activities

Cabot’s restructuring activities were recorded in the Consolidated Statements of Operations for the three months ended December 31, 2023 and 2022 as follows:


	Three Months Ended December 31
	2023		2022
	(In millions)
Cost of sales	$	9	$	—
Total	$	9	$	—

Restructuring Activities and Related Reserves

Details of all restructuring activities and the related reserves during the three months ended December 31, 2023 were as follows:


	Severance and Employee Benefits			Accelerated Depreciation on Assets			Total
	(In millions)
Reserve at September 30, 2023	$	—		$	—		$	—
Charges		3			6			9
Cost charged against assets		—			(6	)		(6	)
Cash paid		(1	)		—			(1	)
Reserve at December 31, 2023	$	2		$	—		$	2

Financial Information by Segment - Schedule of Income (Loss) from Continuing Operations before Income Taxes and Equity in Earnings of Affiliated Companies for Unallocated and Other (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Interest expense	$ (22)	$ (22)
Gain on sale of land		1
Loss on sale of business		(3)
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Interest expense	(22)	(22)
Unallocated corporate costs	(17)	(15)
General unallocated income (expense)	13	4
Less: Equity in earnings of affiliated companies, net of tax	1	2
Income from continuing operations before income taxes and equity in earnings of affiliated companies	(69)	(39)
Certain Items [Member]
Segment Reporting Information [Line Items]
Global restructuring activities (Note H)	(9)
Gain on sale of land		1
Loss on sale of business		(3)
Legal and environmental matters and reserves		(1)
Acquisition and integration-related charges		(1)
Total certain items	(42)	$ (4)
Certain Items [Member] \| Argentina [Member]
Segment Reporting Information [Line Items]
Controlled currency devaluation loss	$ (33)

Significant Accounting Policies

3 Months Ended

Dec. 31, 2023

Accounting Policies [Abstract]

Significant Accounting Policies

B. Significant Accounting Policies

Full detail on the Company’s significant accounting policies may be obtained by referring to Note A in the 2023 10-K.

Argentina Devaluation

The Company’s wholly-owned Argentinian subsidiary operates in a highly inflationary economy and, as a result, the functional currency of the subsidiary is Cabot’s reporting currency, the U.S. dollar. During the three months ended December 31, 2023, the Company recorded foreign exchange losses of $40 million related to the revaluation of non-functional currency denominated monetary asset and liability balances, of which $33 million related to a single devaluation action by the newly elected Argentine government. The Company invests cash in money market funds and recorded investment income of $12 million for the three months ended December 31, 2023. The foreign exchange losses and investment gains are recorded in Other income (expense) in the Consolidated Statement of Operations.

Recently Adopted Accounting Standards

In November 2022, the FASB issued a new standard on the disclosure of supplier financing programs. The new standard requires qualitative and quantitative disclosures as to the nature and potential magnitude of such programs in addition to program activity and changes for the periods presented. The Company adopted this standard on October 1, 2023. See Note J for disclosures related to the Company's supplier financing programs. The adoption of this standard did not have a material impact on the Company's Consolidated Financial Statements.

Recent Accounting Pronouncements

In November 2023, the FASB issued a new standard, Improvement to Reportable Segment Disclosures. The new guidance enhances the disclosure of significant reportable segment expenses. The new standard is effective for fiscal years beginning after December 15, 2023, and early adoption is permitted. The Company is currently evaluating the timing of adoption and the impact of the adoption of this standard on the Company’s Consolidated Financial Statements.

In December 2023, the FASB issued a new standard, Improvements to Income Tax Disclosures. The new guidance requires additional disclosures primarily related to the income tax rate reconciliation and income taxes paid. The new standard is effective for fiscal years beginning after December 15, 2024, and early adoption is permitted. The Company is currently evaluating the timing of adoption and the impact of the adoption of this standard on the Company’s Consolidated Financial Statements.

Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Dec. 31, 2023	Feb. 06, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Trading Symbol	CBT
Entity Registrant Name	Cabot Corporation
Entity Central Index Key	0000016040
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--09-30
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		55,430,710
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity File Number	1-5667
Entity Tax Identification Number	04-2271897
Entity Address, Address Line One	Two Seaport Lane
Entity Address, Address Line Two	Suite 1400
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02210-2019
City Area Code	617
Local Phone Number	345-0100
Security Exchange Name	NYSE
Title of 12(b) Security	Common Stock, $1 par value per share
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes

Consolidated Balance Sheets (Parenthetical) (Unaudited) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Statement of Financial Position [Abstract]
Accounts and notes receivable, reserve for doubtful accounts	$ 3	$ 2
Preferred stock, authorized shares	2,000,000	2,000,000
Preferred stock, par value	$ 1	$ 1
Preferred stock, Issued shares	0	0
Preferred stock, Outstanding shares	0	0
Common stock, authorized shares	200,000,000	200,000,000
Common stock, par value	$ 1	$ 1
Common stock, issued shares	55,560,648	55,379,636
Common stock, outstanding shares	55,424,816	55,243,804
Common treasury stock, shares	135,832	135,832

Goodwill and Intangible Assets

3 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

C. Goodwill and Intangible Assets

The carrying amount of goodwill attributable to each reportable segment and the changes in those balances during the three months ended December 31, 2023 are as follows:


	Reinforcement Materials		Performance Chemicals		Total
	(In millions)
Balance at September 30, 2023	$	51	$	83	$	134
Foreign currency impact		2		2		4
Balance at December 31, 2023	$	53	$	85	$	138

The following table provides information regarding the Company’s intangible assets:


	December 31, 2023							September 30, 2023
	Gross Carrying Value		Accumulated Amortization			Net Intangible Assets		Gross Carrying Value		Accumulated Amortization			Net Intangible Assets
	(In millions)
Intangible assets with finite lives
Developed technologies	$	35	$	(11	)		24	$	34	$	(10	)	$	24
Trademarks		2		(1	)		1		2		(1	)		1
Customer relationships		67		(31	)		36		65		(30	)		35
Total intangible assets	$	104	$	(43	)	$	61	$	101	$	(41	)	$	60

Intangible assets are amortized over their estimated useful lives, which range between ten and twenty-five years, with a weighted average amortization period of approximately seventeen years. Amortization expense was $1 million for both the three months ended December 31, 2023 and 2022. Amortization expense is included in Cost of sales, Selling and administrative expenses and Research and technical expenses in the Consolidated Statements of Operations. Total amortization expense is estimated to be approximately $6 million each year for the next five fiscal years.

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (Parenthetical) $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($)
Statement of Comprehensive Income [Abstract]
Net of tax	$ 1

- Definition

Amount of tax expense (benefit) allocated to other comprehensive income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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-Paragraph 12
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 1
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+ Details

Significant Accounting Policies (Policies)	3 Months Ended
Significant Accounting Policies (Policies)	Dec. 31, 2023
Accounting Policies [Abstract]
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards In November 2022, the FASB issued a new standard on the disclosure of supplier financing programs. The new standard requires qualitative and quantitative disclosures as to the nature and potential magnitude of such programs in addition to program activity and changes for the periods presented. The Company adopted this standard on October 1, 2023. See Note J for disclosures related to the Company's supplier financing programs. The adoption of this standard did not have a material impact on the Company's Consolidated Financial Statements.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In November 2023, the FASB issued a new standard, Improvement to Reportable Segment Disclosures. The new guidance enhances the disclosure of significant reportable segment expenses. The new standard is effective for fiscal years beginning after December 15, 2023, and early adoption is permitted. The Company is currently evaluating the timing of adoption and the impact of the adoption of this standard on the Company’s Consolidated Financial Statements. In December 2023, the FASB issued a new standard, Improvements to Income Tax Disclosures. The new guidance requires additional disclosures primarily related to the income tax rate reconciliation and income taxes paid. The new standard is effective for fiscal years beginning after December 15, 2024, and early adoption is permitted. The Company is currently evaluating the timing of adoption and the impact of the adoption of this standard on the Company’s Consolidated Financial Statements.

Income Tax - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Net discrete tax (benefits) expense related to tax settlements	$ 7	$ 3
Uncertain tax positions from expirations of statute of limitations	$ 1	$ 1
United States Internal Revenue Service (IRS) [Member] \| Earliest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination	2020
United States Internal Revenue Service (IRS) [Member] \| Latest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination	2022
State Tax Authorities [Member] \| Earliest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination	2016
State Tax Authorities [Member] \| Latest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination	2022
Foreign Jurisdictions [Member] \| Earliest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination	2006
Foreign Jurisdictions [Member] \| Latest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination	2022

Divestitures - Additional Information (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2022 USD ($)
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 6

Financial Information by Segment - Revenues From External Customers That are Categorized as Unallocated and Other Reflects Royalties, External Shipping and Handling Fees, The Impact of Unearned Revenue, Discounting Charges For Certain Notes Receivable, and Other By-product Revenue (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues from external customers	$ 958	$ 965
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	32	36
Unallocated and Other [Member] \| Shipping and Handling Costs [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	30	33
Unallocated and Other [Member] \| Other [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	$ 2	$ 3

- Definition

+ References

+ Details

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Current assets:
Cash and cash equivalents	$ 244	$ 238
Accounts and notes receivable, net of reserve for doubtful accounts of $3 and $2	726	695
Inventories:
Raw materials	154	148
Finished goods	398	374
Other	65	63
Total inventories	617	585
Prepaid expenses and other current assets	105	108
Total current assets	1,692	1,626
Property, plant and equipment	3,936	3,827
Accumulated depreciation	2,492	2,415
Net property, plant and equipment	1,444	1,412
Goodwill	138	134
Equity affiliates	21	20
Intangible assets, net	61	60
Deferred income taxes	166	180
Other assets	173	172
Total assets	3,695	3,604
Current liabilities:
Short-term borrowings	206	174
Accounts payable and accrued liabilities	585	600
Income taxes payable	31	40
Current portion of long-term debt	8	8
Total current liabilities	830	822
Long-term debt	1,098	1,094
Deferred income taxes	51	50
Other liabilities	241	231
Contingencies (Note E)
Preferred stock:
Authorized: 2,000,000 shares of $1 par value, Issued and Outstanding: None and none
Common stock:
Authorized: 200,000,000 shares of $1 par value, Issued: 55,560,648 and 55,379,636 shares, Outstanding: 55,424,816 and 55,243,804 shares Less cost of 135,832 and 135,832 shares of common treasury stock	55	55
Less cost of 135,832 and 135,832 shares of common treasury stock	(3)	(3)
Retained earnings	1,582	1,574
Accumulated other comprehensive income (loss)	(305)	(362)
Total Cabot Corporation stockholders' equity	1,329	1,264
Noncontrolling interests	146	143
Total stockholders' equity	1,475	1,407
Total liabilities and stockholders' equity	$ 3,695	$ 3,604

Significant Accounting Policies - Additional Information (Detail) - Other Income (Expense) [Member] $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($)
Significant Accounting Policies [Line Items]
Investment income	$ 12
Revaluation of Non-functional Currency [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses	(40)
Single Devaluation Action [Member]
Significant Accounting Policies [Line Items]
Foreign exchange losses	$ (33)

Goodwill and Intangible Assets - Schedule of Changes in Balances (Detail) $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($)
Goodwill And Intangible Assets [Line Items]
Beginning balance	$ 134
Foreign currency impact	4
Ending balance	138
Reinforcement Materials [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	51
Foreign currency impact	2
Ending balance	53
Performance Chemicals [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	83
Foreign currency impact	2
Ending balance	$ 85

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References + Details

Contingencies - Additional Information (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Respirator Liabilities [Member]
Loss Contingencies [Line Items]
Respirator reserve	$ 38	$ 38

Accumulated Other Comprehensive Income (Loss) ("AOCI") - Changes in Each Component of AOCI, Net of Tax (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 1,407	$ 1,032
Ending Balance	1,475	1,159
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(353)	(429)
Other comprehensive income (loss) before reclassifications	62	88
Amounts reclassified from AOCI	(1)	(1)
Less: Other comprehensive income (loss) attributable to noncontrolling interests	4	6
Ending Balance	(296)	(348)
Pension and Other Postretirement Benefit Liability Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(9)	(10)
Ending Balance	(9)	(10)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(362)	(439)
Other comprehensive income (loss) before reclassifications	62	88
Amounts reclassified from AOCI	(1)	(1)
Less: Other comprehensive income (loss) attributable to noncontrolling interests	4	6
Ending Balance	$ (305)	$ (358)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

- Definition

Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

+ References

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+ Details

Restructuring - Additional Information (Details) $ in Millions	3 Months Ended
	Dec. 31, 2023 USD ($)
RM Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	$ 2
Accelerated depreciation	6
Expected additional restructuring charges	1
PC Plan [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	1
Expected additional restructuring charges	$ 3

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Financial Information by Segment

3 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Financial Information by Segment

K. Financial Information by Segment

The Company identifies a product line as an operating segment if: i) it engages in business activities from which it may earn revenues and incur expenses; ii) its operating results are regularly reviewed by the Chief Operating Decision Maker (“CODM”), who is Cabot’s President and Chief Executive Officer, to make decisions about resources to be allocated to the segment and assess its performance; and iii) it has available discrete financial information. The CODM reviews financial information at the operating segment level to allocate resources and to assess the operating results and financial performance for each operating segment. Operating segments are aggregated into a reportable segment if the operating segments are determined to have similar economic characteristics and if the operating segments are similar in the following areas: i) nature of products and services; ii) nature of production processes; iii) type or class of customer for their products and services; iv) methods used to distribute the products or provide services; and v) if applicable, the nature of the regulatory environment.

The Company has two reportable segments: Reinforcement Materials and Performance Chemicals. The Reinforcement Materials segment combines the reinforcing carbons and engineered elastomer composites product lines. The Performance Chemicals segment aggregates the specialty carbons, specialty compounds, fumed metal oxides, battery materials, inkjet colorants and aerogel product lines.

Income (loss) before income taxes (“Segment EBIT”) is presented for each reportable segment in the table below. Segment EBIT excludes Interest expense, General unallocated income (expense), Unallocated corporate costs and Certain items, meaning items management does not consider representative of on-going operating segment results. In addition, Segment EBIT includes Equity in earnings of affiliated companies, net of tax, royalties, Net income attributable to noncontrolling interests, net of tax, and discounting charges for certain Notes receivable.

Financial information by reportable segment is as follows:


	Reinforcement Materials		Performance Chemicals		Segment Total		Unallocated and Other(1)			Consolidated Total
	(In millions)
Three Months Ended December 31, 2023
Revenues from external customers(2)	$	641	$	285	$	926	$	32		$	958
Income (loss) before income taxes(3)	$	129	$	34	$	163	$	(69	)	$	94

Three Months Ended December 31, 2022
Revenues from external customers(2)	$	643	$	286	$	929	$	36		$	965
Income (loss) before income taxes(3)	$	94	$	29	$	123	$	(39	)	$	84

(1)

(2)


	Three Months Ended December 31
	2023		2022
	(In millions)
Shipping and handling fees	$	30	$	33
Other		2		3
Total	$	32	$	36

(3)


	Three Months Ended December 31
	2023			2022
	(In millions)
Interest expense	$	(22	)	$	(22	)
Certain items(a)
Argentina controlled currency devaluation loss (Note B)		(33	)		—
Global restructuring activities (Note H)		(9	)		—
Gain on sale of land		—			1
Loss on sale of business		—			(3	)
Legal and environmental matters and reserves		—			(1	)
Acquisition and integration-related charges		—			(1	)
Total certain items		(42	)		(4	)
Unallocated corporate costs(b)		(17	)		(15	)
General unallocated income (expense)(c)		13			4
Less: Equity in earnings of affiliated companies, net of tax(d)		1			2
Total	$	(69	)	$	(39	)

(a)

(b)

Unallocated corporate costs are costs that are not controlled by the segments and primarily benefit corporate interests.

(c)

(d)


	Three Months Ended December 31, 2023
	Reinforcement Materials		Performance Chemicals		Consolidated Total
	(In millions)
Americas	$	254	$	88	$	342
Asia Pacific		260		120		380
Europe, Middle East and Africa		127		77		204
Segment revenues from external customers		641		285		926
Unallocated and other						32
Net sales and other operating revenues					$	958


	Three Months Ended December 31, 2022
	Reinforcement Materials		Performance Chemicals		Consolidated Total
	(In millions)
Americas	$	241	$	89	$	330
Asia Pacific		273		126		399
Europe, Middle East and Africa		129		71		200
Segment revenues from external customers		643		286		929
Unallocated and other						36
Net sales and other operating revenues					$	965

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-31

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//280/tableOfContent

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-26

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-34

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

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-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

+ Details

Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 61	$ 66
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of tax	62	88
Derivatives: net investment hedges
(Gains) losses reclassified to interest expense, net of tax	(1)	(1)
Other comprehensive income (loss), net of tax of $ 1 and $ -	61	87
Comprehensive income (loss)	122	153
Net income (loss) attributable to noncontrolling interests, net of tax	11	12
Foreign currency translation adjustment attributable to noncontrolling interests, net of tax	4	6
Comprehensive income (loss) attributable to noncontrolling interests	15	18
Comprehensive income (loss) attributable to Cabot Corporation	$ 107	$ 135

Supplier Financing Programs - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2023	Sep. 30, 2023
Supplier Finance Program [Line Items]
Outstanding payment obligations to financial institutions related to supplier financing programs	$ 17	$ 17
Supplier Finance Program, Obligation, Current, Statement of Financial Position [Extensible Enumeration]	Accounts Payable and Accrued Liabilities, Current	Accounts Payable and Accrued Liabilities, Current

Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Millions	Total	Common Stock, Net of Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total Cabot Corporation Stockholders' Equity [Member]	Noncontrolling Interests [Member]
Beginning Balance at Sep. 30, 2022	$ 1,032	$ 52	$ 1	$ 1,284	$ (439)	$ 898	$ 134
Beginning Balance, Shares at Sep. 30, 2022		56,249
Net income (loss)	66			54		54	12
Total other comprehensive income (loss)	87				81	81	6
Cash dividends paid, Common stock, per share	(21)			(21)		(21)
Cash dividends declared to noncontrolling interests	(2)						(2)
Issuance of stock under equity compensation plans	3	$ 1	2			3
Issuance of stock under equity compensation plans, Shares		309
Share-based compensation	11		11			11
Purchase and retirement of common stock	(17)		(14)	(3)		(17)
Purchase and retirement of common stock, Shares		(242)
Ending Balance at Dec. 31, 2022	1,159	$ 53		1,314	(358)	1,009	150
Ending Balance, Shares at Dec. 31, 2022		56,316
Beginning Balance at Sep. 30, 2023	1,407	$ 52		1,574	(362)	1,264	143
Beginning Balance, Shares at Sep. 30, 2023		55,244
Net income (loss)	61			50		50	11
Total other comprehensive income (loss)	61				57	57	4
Cash dividends paid, Common stock, per share	(22)			(22)		(22)
Cash dividends declared to noncontrolling interests	(12)						(12)
Issuance of stock under equity compensation plans	7		7			7
Issuance of stock under equity compensation plans, Shares		441
Share-based compensation	6		6			6
Purchase and retirement of common stock	(33)		$ (13)	(20)		(33)
Purchase and retirement of common stock, Shares		(260)
Ending Balance at Dec. 31, 2023	$ 1,475	$ 52		$ 1,582	$ (305)	$ 1,329	$ 146
Ending Balance, Shares at Dec. 31, 2023		55,425

Earnings Per Share - Components of Basic and Diluted Earnings (Loss) Per Common Share (EPS) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Basic EPS:
Net income (loss) attributable to Cabot Corporation	$ 50	$ 54
Less: Undistributed earnings allocated to participating securities	1	1
Earnings (loss) allocated to common stockholders (numerator)	$ 49	$ 53
Weighted average common shares and participating securities outstanding	56.4	57.6
Less: Participating securities	1.1	1.3
Adjusted weighted average common shares (denominator)	55.3	56.3
Earnings (loss) per common share - basic:	$ 0.88	$ 0.94
Diluted EPS:
Earnings (loss) allocated to common stockholders	$ 49	$ 53
Plus: Earnings allocated to participating securities	1	1
Less: Adjusted earnings allocated to participating securities	1	1
Earnings (loss) allocated to common stockholders (numerator)	$ 49	$ 53
Adjusted weighted average common shares outstanding	55.3	56.3
Common shares issuable	0.5	0.4
Adjusted weighted average common shares (denominator)	55.8	56.7
Earnings (loss) per common share - diluted:	$ 0.88	$ 0.93

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Net sales and other operating revenues	$ 958	$ 965
Cost of sales	740	784
Gross profit	218	181
Selling and administrative expenses	67	60
Research and technical expenses	15	13
Loss on sale of business		3
Income (loss) from operations	136	105
Interest and dividend income	9	6
Interest expense	(22)	(22)
Other income (expense)	(29)	(5)
Income (loss) from operations before income taxes and equity in earnings of affiliated companies	94	84
(Provision) benefit for income taxes	(34)	(20)
Equity in earnings of affiliated companies, net of tax	1	2
Net income (loss)	61	66
Net income (loss) attributable to noncontrolling interests, net of tax	11	12
Net income (loss) attributable to Cabot Corporation	$ 50	$ 54
Weighted-average common shares outstanding:
Basic	55.3	56.3
Diluted	55.8	56.7
Earnings (loss) per common share:
Basic	$ 0.88	$ 0.94
Diluted	$ 0.88	$ 0.93

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Goodwill And Intangible Assets [Line Items]
Amortization expense estimated for year one	$ 6
Amortization expense estimated for year two	6
Amortization expense estimated for year three	6
Amortization expense estimated for year four	6
Amortization expense estimated for year five	6
Cost of Sales, Selling and Administrative Expenses and Research and Technical Expenses [Member]
Goodwill And Intangible Assets [Line Items]
Amortization of intangible assets	$ 1	$ 1
Minimum [Member]
Goodwill And Intangible Assets [Line Items]
Useful life of intangible assets	10 years
Maximum [Member]
Goodwill And Intangible Assets [Line Items]
Useful life of intangible assets	25 years
Weighted Average [Member]
Goodwill And Intangible Assets [Line Items]
Useful life of intangible assets	17 years

Contingencies

3 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Contingencies

E. Contingencies

Respirator Liabilities

Cabot has exposure in connection with a safety respiratory products business that a subsidiary acquired from American Optical Corporation (“AO”) in an April 1990 asset purchase transaction. The subsidiary manufactured respirators under the AO brand and disposed of that business in July 1995. In connection with its acquisition of the business, the subsidiary agreed, in certain circumstances, to assume a portion of AO’s liabilities, including costs of legal fees together with amounts paid in settlements and judgments, allocable to AO respiratory products used prior to the 1990 purchase by the Cabot subsidiary. In exchange for the subsidiary’s assumption of certain of AO’s respirator liabilities, AO agreed to provide to the subsidiary the benefits of: (i) AO’s insurance coverage for the period prior to the 1990 acquisition and (ii) a former owner’s indemnity of AO holding it harmless from any liability allocable to AO respiratory products used prior to May 1982. As more fully described in the 2023 10-K, the respirator liabilities generally involve claims for personal injury, including asbestosis, silicosis and coal worker’s pneumoconiosis, allegedly resulting from the use of respirators that are alleged to have been negligently designed and/or labeled. At no time did this respiratory product line represent a significant portion of the respirator market. In addition to Cabot’s subsidiary, other parties are responsible for significant portions of the costs of these respirator liabilities (as defined in the 2023 10-K, the “Payor Group”).

Cabot has a reserve to cover its expected share of liabilities for pending and future respirator liability claims, which is included in Other liabilities and Accounts payable and accrued liabilities on the Consolidated Balance Sheets. The Company expects these liabilities to be incurred over a number of years. The reserve balance was $38 million at both December 31, 2023 and September 30, 2023.

The Company’s current estimate of the cost of its share of pending and future respirator liability claims is based on facts and circumstances existing at this time, including the number and nature of the remaining claims. Developments that could affect the Company’s estimate include, but are not limited to, (i) significant changes in the number of future claims, (ii) changes in the rate of dismissals without payment of pending claims, (iii) significant changes in the average cost of resolving claims, including potential settlements of groups of claims, (iv) significant changes in the legal costs of defending these claims, (v) changes in the nature of claims received or changes in our assessment of the viability of these claims, (vi) trial and appellate outcomes, (vii) changes in the law and procedure applicable to these claims, (viii) the financial viability of the parties that contribute to the payment of respirator claims, (ix) exhaustion or changes in the recoverability of the insurance coverage maintained by certain members of the Payor Group, or a change in the availability of the indemnity provided by a former owner of AO, (x) changes in the allocation of costs among the various parties paying legal and settlement costs, and (xi) a determination that the assumptions that were used to estimate Cabot’s share of liability are no longer reasonable. The Company cannot determine the impact of these potential developments on its current estimate of its share of liability for existing and future claims. Because reserves are limited to amounts that are probable and estimable as of a relevant measurement date, and there is inherent difficulty in projecting the impact of potential developments on Cabot’s share of liability for these existing and future claims, it is reasonably possible that the liabilities for existing and future claims could change in the near term and that change could be material.

Other Matters

The Company has various other lawsuits, claims and contingent liabilities arising in the ordinary course of its business and with respect to its divested businesses. The Company does not believe that any of these matters will have a material adverse effect on its financial position; however, litigation is inherently unpredictable. Cabot could incur judgments, enter into settlements or revise its expectations regarding the outcome of certain matters, and such developments could have a material impact on its results of operations in the period in which the amounts are accrued or its cash flows in the period in which the amounts are paid.

- Definition

The entire disclosure for loss and gain contingencies. Describes any existing condition, situation, or set of circumstances involving uncertainty as of the balance sheet date (or prior to issuance of the financial statements) as to a probable or reasonably possible loss incurred by an entity that will ultimately be resolved when one or more future events occur or fail to occur, and typically discloses the amount of loss recorded or a range of possible loss, or an assertion that no reasonable estimate can be made.

+ References + Details

Financial Information by Segment - Revenue from External Customers by Geographic Region (Detail) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Net sales and other operating revenues	$ 958	$ 965
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	926	929
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	32	36
Americas [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	342	330
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	380	399
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	204	200
Reinforcement Materials [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	641	643
Reinforcement Materials [Member] \| Americas [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	254	241
Reinforcement Materials [Member] \| Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	260	273
Reinforcement Materials [Member] \| Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	127	129
Performance Chemicals [Member] \| Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	285	286
Performance Chemicals [Member] \| Americas [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	88	89
Performance Chemicals [Member] \| Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	120	126
Performance Chemicals [Member] \| Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	$ 77	$ 71

- Definition

+ References

+ Details