Cabot (CBT) 10-K 23 Nov 22 2022 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Sep. 30, 2022	Nov. 14, 2022	Mar. 31, 2022
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Trading Symbol	CBT
Entity Registrant Name	Cabot Corporation
Entity Central Index Key	0000016040
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		56,328,840
Entity Public Float			$ 3,840,397,570
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Interactive Data Current	Yes
Entity File Number	1-5667
Entity Incorporation, State or Country Code	DE
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
City Area Code	617
Local Phone Number	345-0100
Document Annual Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock, $1 par value per share
Security Exchange Name	NYSE
ICFR Auditor Attestation Flag	true
Auditor Firm ID	34
Auditor Name	Deloitte & Touche LLP
Auditor Location	Boston, Massachusetts

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Net sales and other operating revenues	$ 4,321	$ 3,409	$ 2,614
Cost of sales	3,436	2,610	2,114
Gross profit	885	799	500
Selling and administrative expenses	258	289	292
Research and technical expenses	55	56	57
Gain on bargain purchase of a business (Note C)	(24)
Income (loss) from operations	389	454	21
Interest and dividend income	11	8	8
Interest expense	(56)	(49)	(53)
Other income (expense)	(9)	(7)	(9)
Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies	335	406	(33)
(Provision) benefit for income taxes	(102)	(123)	(191)
Equity in earnings of affiliated companies, net of tax	10	3	3
Net income (loss)	243	286	(221)
Net income (loss) attributable to noncontrolling interests, net of tax of $8, $10 and $4	34	36	17
Net income (loss) attributable to Cabot Corporation	$ 209	$ 250	$ (238)
Weighted-average common shares outstanding:
Basic	56.5	56.7	56.6
Diluted	56.9	56.8	56.6
Earnings (loss) per common share:
Basic	$ 3.65	$ 4.35	$ (4.21)
Diluted	$ 3.62	$ 4.34	$ (4.21)
Specialty Fluids [Member]
Loss on sale and asset impairment charge			$ 1
Purification Solutions [Member]
Loss on sale and asset impairment charge	$ 207
Marshall Mine [Member]
Loss on sale and asset impairment charge			$ 129

Consolidated Statements of Op_2

Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net income attributable to noncontrolling interests, tax amount	$ 8	$ 10	$ 4

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ 243	$ 286	$ (221)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of tax	(175)	52	42
Derivatives: net investment hedges
(Gains) losses reclassified to interest expense, net of tax	(6)	(5)	(5)
(Gains) losses excluded from effectiveness testing and amortized to interest expense, net of tax	2	2	2
Pension and other postretirement benefit liability adjustments, net of tax	14	20	9
Other comprehensive income (loss), net of tax of $3, $8 and $1	(165)	69	48
Comprehensive income (loss)	78	355	(173)
Net income (loss) attributable to noncontrolling interests, net of tax	34	36	17
Foreign currency translation adjustment attributable to noncontrolling interests, net of tax	(15)	7	5
Comprehensive income (loss) attributable to noncontrolling interests	19	43	22
Comprehensive income (loss) attributable to Cabot Corporation	$ 59	$ 312	$ (195)

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net of tax	$ 3	$ 8	$ 1

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Current assets:
Cash and cash equivalents	$ 206	$ 168
Accounts and notes receivable, net of reserve for doubtful accounts of $3 and $4	836	645
Inventories	664	523
Prepaid expenses and other current assets	114	89
Total current assets	1,820	1,425
Property, plant and equipment	3,554	3,885
Accumulated depreciation	(2,284)	(2,509)
Net property, plant and equipment	1,270	1,376
Goodwill	129	140	[1]
Equity affiliates	20	40
Intangible assets, net	63	100
Deferred income taxes	45	53
Other assets	178	172
Total assets	3,525	3,306
Current liabilities:
Short-term borrowings	347	72
Accounts payable and accrued liabilities	707	667
Income taxes payable	44	35
Current portion of long-term debt	7	373
Total current liabilities	1,105	1,147
Long-term debt	1,089	717
Deferred income taxes	65	73
Other liabilities	234	279
Commitments and contingencies (Note S)
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: 56,385,963 and 56,870,237 shares, Outstanding: 56,248,559 and 56,726,818 shares	56	57
Less cost of 137,404 and 143,419 shares of common treasury stock	(4)	(4)
Additional paid-in capital	1	24
Retained earnings	1,284	1,159
Accumulated other comprehensive income (loss)	(439)	(289)
Total Cabot Corporation stockholders’ equity	898	947
Noncontrolling interests	134	143
Total stockholders’ equity	1,032	1,090
Total liabilities and stockholders’ equity	$ 3,525	$ 3,306
[1] The balance as of September 30, 2021 included $444 million of accumulated impairment losses associated with the goodwill of Purification Solutions segment.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Statement Of Financial Position [Abstract]
Accounts and notes receivable, reserve for doubtful accounts	$ 3	$ 4
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	56,385,963	56,870,237
Common stock, outstanding shares	56,248,559	56,726,818
Common treasury stock, shares	137,404	143,419

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Cash Flows from Operating Activities:
Net income (loss)	$ 243	$ 286	$ (221)
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Depreciation and amortization	146	160	158
Gain on bargain purchase of a business	(24)
Gain on sale of land	(17)
Deferred tax provision (benefit)	(40)	9	130
Employee benefit plan settlement	(1)	5	4
Equity in net income of affiliated companies	(10)	(3)	(3)
Share-based compensation	23	21	9
Other non-cash (income) expense	20	21	8
Cash dividends received from equity affiliates	1	2	1
Changes in assets and liabilities:
Accounts and notes receivable	(287)	(215)	126
Inventories	(259)	(174)	114
Prepaid expenses and other current assets	(25)	(37)	(7)
Accounts payable and accrued liabilities	115	167	(55)
Income taxes payable	15	14	(5)
Other liabilities	(7)	1	(11)
Cash provided by operating activities	100	257	377
Cash Flows from Investing Activities:
Additions to property, plant and equipment	(211)	(195)	(200)
Proceeds from sale of Purification Solutions business	79
Cash paid for acquisition of business, net of cash acquired of $5, $— and $1	(9)		(92)
Proceeds from sale of land	18
Other	5	9	4
Cash used in investing activities	(118)	(186)	(288)
Cash Flows from Financing Activities:
Increase (decrease) in short-term borrowings	26
Proceeds from (repayments of) issuance of commercial paper, net	250	58	(19)
Proceeds from long-term debt, net of issuance costs	394	200	444
Repayments of long-term debt	(372)	(222)	(410)
Purchases of common stock	(53)	(3)	(44)
Proceeds from sales of common stock	6	6	3
Cash dividends paid to noncontrolling interests	(22)	(19)	(26)
Cash dividends paid to common stockholders	(84)	(80)	(80)
Cash provided by (used in) financing activities	145	(60)	(132)
Effects of exchange rate changes on cash	(91)	8	25
Increase (decrease) in cash, cash equivalents and restricted cash	36	19	(18)
Cash, cash equivalents and restricted cash at beginning of year	170	151	169
Cash, cash equivalents and restricted cash at end of year	206	170	151
The following table presents the Company’s cash, cash equivalents and restricted cash by category within the Consolidated Balance Sheets:
Cash and cash equivalents	$ 206	168	$ 151
Restricted cash classified within Prepaid expenses and other current assets		$ 2
Restricted Cash and Cash Equivalents, Current, Statement of Financial Position [Extensible Enumeration]	PrepaidExpensesAndOtherCurrentAssets	PrepaidExpensesAndOtherCurrentAssets	PrepaidExpensesAndOtherCurrentAssets
Cash, cash equivalents and restricted cash	$ 206	$ 170	$ 151
Non-cash investing activities and supplemental cash flow information:
Additions to property, plant and equipment included in Accounts payable and accrued liabilities	24	41	29
Income taxes paid	129	93	71
Interest paid	46	$ 41	48
Purification Solutions [Member]
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Loss on sale of business and asset impairment charge	$ 207
Marshall Mine [Member]
Adjustments to reconcile net income (loss) to cash provided by operating activities:
Loss on sale of business and asset impairment charge			$ 129

Consolidated Statements of Ca_2

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2020
Statement Of Cash Flows [Abstract]
Cash acquired in acquisition of business	$ 5	$ 1

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - 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, 2019	$ 1,134	$ 52		$ 1,337	$ (391)	$ 998	$ 136
Beginning Balance, Shares at Sep. 30, 2019		57,081
Net income (loss)	(221)			(238)		(238)	17
Adoption of accounting standards				3	(3)
Total other comprehensive income (loss)	48				43	43	5
Cash dividends declared to noncontrolling interests	(35)						(35)
Cash dividends declared, Common stock, per share	(80)			(80)		(80)
Issuance of stock under equity compensation plans	3	$ 2	$ 1			3
Issuance of stock under equity compensation plans, Shares		330
Share-based compensation	9		9			9
Purchase and retirement of common stock	(44)	$ (1)	(10)	(33)		(44)
Purchase and retirement of common stock, Shares		(944)
Ending Balance at Sep. 30, 2020	814	$ 53		989	(351)	691	123
Ending Balance, Shares at Sep. 30, 2020		56,467
Net income (loss)	286			250		250	36
Total other comprehensive income (loss)	69				62	62	7
Cash dividends declared to noncontrolling interests	(23)						(23)
Cash dividends declared, Common stock, per share	(80)			(80)		(80)
Issuance of stock under equity compensation plans	6		6			6
Issuance of stock under equity compensation plans, Shares		317
Share-based compensation	21		21			21
Purchase and retirement of common stock	(3)		(3)			(3)
Purchase and retirement of common stock, Shares		(57)
Ending Balance at Sep. 30, 2021	1,090	$ 53	24	1,159	(289)	947	143
Ending Balance, Shares at Sep. 30, 2021		56,727
Net income (loss)	243			209		209	34
Total other comprehensive income (loss)	(165)				(150)	(150)	(15)
Cash dividends declared to noncontrolling interests	(28)						(28)
Cash dividends declared, Common stock, per share	(84)			(84)		(84)
Issuance of stock under equity compensation plans	6		6			6
Issuance of stock under equity compensation plans, Shares		359
Share-based compensation	23		23			23
Purchase and retirement of common stock	(53)	$ (1)	(52)			(53)
Purchase and retirement of common stock, Shares		(837)
Ending Balance at Sep. 30, 2022	$ 1,032	$ 52	$ 1	$ 1,284	$ (439)	$ 898	$ 134
Ending Balance, Shares at Sep. 30, 2022		56,249

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Statement Of Stockholders Equity [Abstract]
Cash dividends declared, per share	$ 1.48	$ 1.40	$ 1.40

Significant Accounting Policies

Significant Accounting Policies	12 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
Significant Accounting Policies	Note A. Significant Accounting Policies The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”). The significant accounting policies of Cabot Corporation (“Cabot” or “the Company”) are described below. Unless otherwise indicated, all disclosures and amounts in the Notes to the Consolidated Financial Statements relate to the Company’s continuing operations. Principles of Consolidation The consolidated financial statements include the accounts of Cabot and its wholly-owned subsidiaries and majority-owned and controlled subsidiaries. Additionally, Cabot considers consolidation of entities over which control is achieved through means other than voting rights, of which there were none in the periods presented. Intercompany transactions have been eliminated in consolidation. Cash and Cash Equivalents Cash equivalents include all highly liquid investments with a maturity of three months or less at date of acquisition. Cabot continually assesses the liquidity of cash equivalents and, as of September 30, 2022, has determined that they are readily convertible to cash. Inventories Inventories are stated at the lower of cost or net realizable value. The cost of inventories is determined using the first-in, first-out method. Cabot periodically reviews inventory for both potential obsolescence and potential declines in anticipated selling prices. In this review, the Company makes assumptions about the future demand for and market value of the inventory, and based on these assumptions estimates the amount of any obsolete, unmarketable, slow moving, or overvalued inventory. Cabot writes down the value of these inventories by an amount equal to the difference between the cost of the inventory and its estimated net realizable value. Investments The Company has investments in equity affiliates and marketable securities. As circumstances warrant, all investments are subject to periodic impairment reviews. Unless consolidation is required, investments in equity affiliates, where Cabot generally owns between 20% and 50% of the affiliate, are accounted for using the equity method. Cabot records its share of the equity affiliate’s results of operations based on its percentage of ownership of the affiliate. Dividends declared from equity affiliates are a return on investment and are recorded as a reduction to the equity investment value. At September 30, 2022 and 2021, Cabot had equity affiliate investments of an Intangible Assets and Goodwill Impairment The Company records tangible and intangible assets acquired and liabilities assumed in business combinations under the acquisition method of accounting. Amounts paid for an acquisition are allocated to the assets acquired and liabilities assumed based on their fair values at the date of acquisition. The Company uses assumptions and estimates in determining the fair value of assets acquired and liabilities assumed in a business combination. The determination of the fair value of intangible assets requires the use of significant judgment with regard to assumptions used in the valuation model. The Company estimates the fair value of identifiable acquisition-related intangible assets principally based on projections of cash flows that will arise from these assets. The projected cash flows are discounted to determine the fair value of the assets at the dates of acquisition. Definite-lived intangible assets, which are comprised of trademarks, customer relationships and developed technologies, are amortized over their estimated useful lives and are reviewed for impairment when indication of potential impairment exists, such as a significant reduction in cash flows associated with the assets. Goodwill is comprised of the purchase price of business acquisitions in excess of the fair value assigned to the net tangible and identifiable intangible assets acquired. Goodwill is not amortized and is subject to impairment testing annually, or when events or changes in the business environment indicate that the carrying value of the reporting unit may exceed its fair value. A reporting unit, for the purpose of the impairment test, is at or below the operating segment level, and constitutes a business for which discrete financial information is available and regularly reviewed by segment management. Reinforcement Materials, and the fumed metal oxides, specialty compounds, and battery materials product lines within Performance Chemicals, which are considered separate reporting units, carry the Company’s goodwill balances as of September 30, 2022. For the purpose of the goodwill impairment test, the Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If an initial qualitative assessment identifies that it is more likely than not that the carrying value of a reporting unit exceeds its estimated fair value, an additional quantitative evaluation is performed. Alternatively, the Company may elect to proceed directly to the quantitative goodwill impairment test. If based on the quantitative evaluation the fair value of the reporting unit is less than its carrying amount, a goodwill impairment loss would result. The goodwill impairment loss would be the amount by which the carrying value of the reporting unit, including goodwill, exceeds its fair value, limited to the total amount of goodwill allocated to that reporting unit. The fair value of a reporting unit is based on discounted estimated future cash flows. The assumptions used to estimate fair value include management’s best estimates of future growth rates, operating cash flows, capital expenditures and discount rates over an estimate of the remaining operating period at the reporting unit level. The fair value is also benchmarked against the value calculated from a market approach using the guideline public company method. Based on the Company’s most recent annual goodwill impairment test performed as of August 31, 20 2 2 , the fair values of the R einforcement Materials, f umed m etal o xides , s pecialty c ompounds , and battery materials reporting units were substantially in excess of their carrying values. Long-lived Assets Impairment The Company’s long-lived assets primarily include property, plant and equipment, and intangible assets. The carrying values of long-lived assets are reviewed for impairment whenever events or changes in business circumstances indicate that the carrying amount of an asset may not be recoverable. To test for impairment of assets, the Company generally uses a probability-weighted estimate of the future undiscounted net cash flows of the assets over their remaining lives to determine if the value of the asset is recoverable. Long-lived assets are grouped with other assets and liabilities at the lowest level for which independent identifiable cash flows are determinable. An asset impairment is recognized when the carrying value of the asset is not recoverable based on the analysis described above, in which case the asset is written down to its fair value. If the asset does not have a readily determinable market value, a discounted cash flow model may be used to determine the fair value of the asset. In circumstances when an asset does not have separate identifiable cash flows, an impairment charge is recorded when the Company no longer intends to use the asset. Property, Plant and Equipment Property, plant and equipment are recorded at cost. Depreciation of property, plant and equipment is calculated using the straight-line method over the estimated useful lives of the related assets. The depreciable lives for buildings, machinery and equipment, and other fixed assets are generally between twenty and twenty-five years, ten and twenty-five years, and three and twenty-five years, respectively. The cost and accumulated depreciation for property, plant and equipment sold, retired, or otherwise disposed of are removed from the Consolidated Balance Sheets and resulting gains or losses are included in earnings in the Consolidated Statements of Operations. Expenditures for repairs and maintenance are charged to expenses as incurred. Expenditures for major renewals and betterments, which significantly extend the useful lives of existing plant and equipment, are capitalized and depreciated. Cabot capitalizes interest costs when they are part of the cost of acquiring and constructing certain assets that require a period of time to prepare for their intended use. During fiscal 2022, 2021 and 2020, Cabot capitalized $3 million, $1 million and $2 million of interest costs, respectively. These amounts are amortized over the lives of the related assets when they are placed in service. Asset Retirement Obligations Cabot estimates incremental costs for special handling, removal and disposal of materials that may or will give rise to conditional asset retirement obligations (“ARO”) and then discounts the expected costs back to the current year using a credit adjusted risk free rate. Cabot recognizes ARO liabilities and costs when the timing and/or settlement can be reasonably estimated. In certain instances, Cabot has not recorded a reserve for AROs because the timing of disposal of the underlying asset is unknown. The ARO reserves were $10 million and $19 million at September 30, 2022 and 2021, respectively. The decrease was primarily driven by the sale of the Purification Solutions business. Foreign Currency Translation The functional currency of the majority of Cabot’s foreign subsidiaries is the local currency in which the subsidiary operates. Assets and liabilities of foreign subsidiaries are translated into U.S. dollars at exchange rates in effect at the balance sheet dates. Income and expense items are translated at average monthly exchange rates during the year. The functional currency of Cabot’s foreign subsidiaries that operate in a highly inflationary economy is the U.S. dollar. Cabot’s operations in highly inflationary economies are not material. Unrealized currency translation adjustments (“CTA”) are included as a separate component of Accumulated other comprehensive income (loss) (“AOCI”) within stockholders’ equity. Realized and unrealized foreign currency gains and losses arising from transactions denominated in currencies other than the subsidiary’s functional currency are reflected in earnings with the exception of (i) intercompany transactions considered to be of a long-term investment nature; (ii) income taxes upon future repatriation of unremitted earnings from non-U.S. subsidiaries that are not indefinitely reinvested; and (iii) foreign currency borrowings designated as net investment hedges. Gains or losses arising from these transactions are included within the CTA component of Other comprehensive income (loss). In fiscal 2022, 2021 and 2020, net foreign currency transaction loss of $13 million, $6 million, and $6 million, respectively, is included in Other income (expense) in the Consolidated Statements of Operations. Share Repurchases Periodically, Cabot repurchases shares of the Company’s common stock in the open market or in privately negotiated transactions under the authorization approved by the Board of Directors. The Company retires the repurchased shares and records the excess of the purchase price over par value to additional paid-in capital (“APIC”) until such amount is reduced to zero and then charges the remainder against retained earnings. Financial Instruments Cabot’s financial instruments consist primarily of cash and cash equivalents, accounts and notes receivable, investments, accounts payable and accrued liabilities, short-term and long-term debt, and derivative instruments. The carrying values of Cabot’s financial instruments approximate fair value with the exception of fixed rate long-term debt, which is recorded at amortized cost. The fair values of the Company’s financial instruments are based on quoted market prices, if such prices are available. In situations where quoted market prices are not available, the Company relies on valuation models to derive fair value. Such valuations take into account the ability of the financial counterparty to perform and the Company’s own credit risk. Cabot uses derivative financial instruments primarily for purposes of hedging the exposures to fluctuations in foreign currency exchange rates, which exist as part of its on-going business operations. Cabot does not enter into derivative contracts for speculative purposes, nor does it hold or issue any derivative contracts for trading purposes. All derivatives are recognized on the Consolidated Balance Sheets at fair value. Where Cabot has a legal right to offset derivative settlements under a master netting agreement with a counterparty, derivatives with that counterparty are presented on a net basis. The changes in the fair value of derivatives are recorded in either earnings or AOCI, depending on whether or not the instrument is designated as part of a hedge transaction and, if designated as part of a hedge transaction, the type of hedge transaction. The gains or losses on derivative instruments reported in AOCI are reclassified to earnings in the period in which earnings are affected by the underlying hedged item. The ineffective portion of all hedges is recognized in earnings during the period in which the ineffectiveness occurs. In accordance with Cabot’s risk management strategy, the Company may enter into certain derivative instruments that may not be designated as hedges for hedge accounting purposes. Although these derivatives are not designated as hedges, the Company believes that such instruments are closely correlated with the underlying exposure, thus managing the associated risk. The Company records in earnings the gains or losses from changes in the fair value of derivative instruments that are not designated as hedges. Cash movements associated with these instruments are presented in the Consolidated Statements of Cash Flows as Cash Flows from Operating Activities because the derivatives are designed to mitigate risk to the Company’s cash flow from operations. Revenue Recognition Cabot recognizes revenue when its customers obtain control of promised goods or services. The revenue recognized is the amount of consideration which the Company expects to receive in exchange for those goods or services. The Company’s contracts with customers are generally for products only and do not include other performance obligations. Generally, Cabot considers purchase orders, which in some cases are governed by master supply agreements, to be contracts with customers. The transaction price as specified on the purchase order or sales contract is considered the standalone selling price for each distinct product. To determine the transaction price at the time when revenue is recognized, the Company evaluates whether the price is subject to adjustments, such as for returns, discounts or volume rebates, which are stated in the customer contract, to determine the net consideration to which the Company expects to be entitled. Revenue from product sales is recognized based on a point in time model when control of the product is transferred to the customer, which typically occurs upon shipment or delivery of the product to the customer and title, risk and rewards of ownership have passed to the customer. The Company has an immaterial amount of revenue that is recognized over time. Payment terms typically range from zero to ninety days Shipping and handling activities that occur after the transfer of control to the customer are billed to customers and are recorded as sales revenue, as the Company considers these to be fulfillment costs. Shipping and handling costs are expensed in the period incurred and included in Cost of sales within the Consolidated Statement of Operations. Taxes collected on sales to customers are excluded from the transaction price. The Company generally provides a warranty that its products will substantially conform to the identified specifications. The Company’s liability typically is limited to either a credit equal to the purchase price or replacement of the non-conforming product. Returns under warranty have historically been immaterial. The Company does not have contract assets or liabilities that are material. When the period of time between the transfer of control of the goods and the time the customer pays for the goods is one year or less, the Company does not consider there to be a significant financing component associated with the contract. Cost of Sales Cost of sales consists of the cost of raw and packaging materials, direct manufacturing costs, depreciation, internal transfer costs, inspection costs, inbound and outbound freight and shipping and handling costs, plant purchasing and receiving costs and other overhead expenses necessary to manufacture the products. Accounts and Notes Receivable Trade receivables are recorded at the invoiced amount and generally do not bear interest. Trade receivables in China may at certain times be settled with the receipt of bank issued non-interest bearing notes. These notes totaled $8 million and $5 million as of September 30, 2022 and 2021, respectively, and are included in Accounts and notes receivable on the Company’s Consolidated Balance Sheets. Cabot periodically sells a portion of these bank notes and other customer receivables at a discount and such sales are accounted for as asset sales. The Company does not have any continuing involvement with these notes or other customer receivables after the sale. The difference between the proceeds from the sale and the carrying value of these assets is recognized as a loss on the sale of receivables and is included in Other income (expense) in the accompanying Consolidated Statements of Operations. During fiscal year 2022, 2021, and 2020, the Company recorded charges of $3 million, $2 million, and $2 million, respectively, for the sale of these assets. Cabot maintains allowances for doubtful accounts based on an assessment of the collectability of specific customer accounts, the aging of accounts receivable and other economic information on both a historical and prospective basis. Customer account balances are charged against the allowance when it is probable the receivable will not be recovered. There were no material changes in the allowance for any of the years presented. There is no material off-balance sheet credit exposure related to customer receivable balances. Stock-based Compensation Cabot recognizes compensation expense for stock-based awards granted to employees using the fair value method. Under the fair value recognition provisions, stock-based compensation cost is measured at the grant date based on the fair value of the award, and is recognized as expense over the service period, which generally represents the vesting period, and includes an estimate of what level of performance the Company will achieve for Cabot’s performance-based stock awards. Cabot calculates the fair value of its stock options using the Black-Scholes option pricing model. The fair value of restricted stock units is determined using the closing price of Cabot stock on the day of the grant. The Company recognizes forfeitures as they occur. Selling and Administrative Expenses Selling and administrative expenses consist of salaries and fringe benefits of sales and office personnel, general office expenses and other expenses not directly related to manufacturing operations. Research and Technical Expenses Research and technical expenses include salaries, equipment and material expenditures, and contractor fees and are expensed as incurred. Pensions and Other Postretirement Benefits The Company recognizes the funded status of defined benefit pension and other postretirement benefit plans as an asset or liability. This amount is defined as the difference between the fair value of plan assets and the benefit obligation. Pension and post-retirement benefit costs other than service cost are included in Other income (expense) in the Consolidated Statement of Operations. Service cost is included with other employee compensation costs within Cost of sales, Selling and administrative expenses, or Research and technical expenses. The Company is required to recognize as a component of Other comprehensive income (loss), net of tax, the actuarial gains and losses and prior service costs and credits that arise but were not previously required to be recognized as components of net periodic benefit cost. Other comprehensive income (loss) is adjusted as these amounts are later recognized in income as components of net periodic benefit cost. Accumulated Other Comprehensive Income (Loss) AOCI, which is included as a component of stockholders’ equity, includes unrealized gains or losses on derivative instruments, currency translation adjustments in foreign subsidiaries and pension and post-retirement related adjustments. Income Taxes Deferred income taxes are determined based on the estimated future tax effects of differences between financial statement carrying amounts and the tax bases of existing assets and liabilities. Deferred tax assets are recognized to the extent that realization of those assets is considered to be more likely than not. A valuation allowance is established for deferred taxes when it is more likely than not that all or a portion of the deferred tax assets will not be realized. Provisions are made for the U.S. income tax liability and additional non-U.S. taxes on the undistributed earnings of non-U.S. subsidiaries, except for amounts Cabot has designated to be indefinitely reinvested. Cabot records benefits for uncertain tax positions based on an assessment of whether the position is more likely than not to be sustained by the taxing authorities. If this threshold is not met, no tax benefit of the uncertain tax position is recognized. If the threshold is met, the tax benefit that is recognized is the largest amount that is greater than 50% likely of being realized upon ultimate settlement. This analysis presumes the taxing authorities’ full knowledge of the positions taken and all relevant facts, but does not consider the time value of money. The Company also accrues for interest and penalties on its uncertain tax positions and includes such charges in its income tax provision in the Consolidated Statements of Operations. Contingencies Cabot accrues costs related to contingencies when it is probable that a liability has been incurred and the amount can be reasonably estimated. Contingencies could arise from litigation, environmental remediation or contractual arrangements. When a single liability amount cannot be reasonably estimated, but a range can be reasonably estimated, Cabot accrues the amount that reflects the best estimate within that range or the low end of the range if no estimate within the range would be considered more likely than any other estimate. The amount accrued is determined through the evaluation of various information, which could include claims, settlement offers, demands by government agencies, estimates performed by independent third parties, identification of other responsible parties and an assessment of their ability to contribute, and our prior experience. Cabot does not reduce its estimated liability for possible recoveries from insurance carriers. Proceeds from insurance carriers are recorded when realized by either the receipt of cash or a contractual agreement. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reported period. Actual results could differ from those estimates.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	12 Months Ended
	Sep. 30, 2022
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	Note B. Recent Accounting Pronouncements Recently Adopted Accounting Standards In December 2019, the FASB issued a new standard Simplifying the Accounting for Income Taxes. The new guidance simplifies the accounting for income taxes by removing several exceptions in the current standard and adding guidance to reduce complexity in certain areas. The new standard is effective for fiscal years beginning after December 15, 2020 and early adoption is permitted. The adoption of this standard did not materially impact the Company’s Consolidated Financial Statements. Recently Issued Accounting Pronouncements In March 2020, the FASB issued a new standard on Reference Rate Reform, which provides temporary optional expedients and exceptions to the existing guidance on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. The standard was effective upon issuance and may generally be applied through December 31, 2022 to any new or amended contracts, hedging relationships, and other transactions that reference LIBOR. As outlined in Note I, Debt and Other Obligations , the Company amended and restated credit agreements to align with the customary LIBOR replacement language. As such, the application of the expedients did not have an impact on the Consolidated Financial Statements. In August 2022, the U.S. government enacted the Inflation Reduction Act which, among other things, provides for a 1% excise tax on stock repurchases. The Company is currently evaluating the provisions of the act but does not anticipate these provisions will have a material effect on its Consolidated Financial Statements, or its share repurchase program. In November 2022, the FASB issued a new standard on the disclosure of supplier financing programs. The new standard requires qualitative and quantitative disclosure as to the nature and potential magnitude of such programs in addition to program activity and changes for the periods presented. The standard is effective for fiscal years beginning after December 15, 2022 and early adoption is permitted. The Company is currently evaluating the timing of adoption and the impact of the adoption of this standard on its Consolidated Financial Statements.

Acquisitions

Acquisitions	12 Months Ended
	Sep. 30, 2022
Business Combinations [Abstract]
Acquisitions	Note C. Acquisitions Tokai Carbon (Tianjin) Co. On February 28, 2022, the Company purchased 100% of the registered capital of Tokai Carbon (Tianjin) Co., a carbon black manufacturing facility, from Tokai Carbon Group for a net purchase price of $9 million, consisting of cash consideration of $14 million, including customary post-closing adjustments, and net of $5 million of cash acquired. The final allocation of the purchase price and calculation of the Gain on bargain purchase of a business set forth below was based on estimates of the fair value of assets and liabilities acquired as of February 28, 2022. (In millions) Fair value of asset acquired Cash $ 5 Accounts and notes receivable 5 Inventories 11 Prepaid expenses and other current assets 7 Property, plant and equipment 12 Amounts attributable to assets acquired 40 Fair value of liabilities assumed Accounts payable and accrued liabilities (2 ) Amounts attributable to liabilities assumed (2 ) Total identifiable net assets 38 Cash Consideration 14 Gain on bargain purchase of a business $ 24 The excess of the fair value of the net assets over the purchase price was recorded as a gain of $24 million. The Gain on bargain purchase of a business arose primarily due to necessary equipment upgrades that will be required after the purchase to continue to utilize the existing assets. Shenzhen Sanshun Nano New Materials Co., Ltd On April 1, 2020, the Company purchased Shenzhen Sanshun Nano New Materials Co., Ltd (“SUSN”), a leading carbon nanotube producer, for a purchase price of $100 million, consisting of: (i) cash consideration of $84 million, net of $1 million acquired (ii) contingent consideration of $3 million paid over the two-year period ending March 31, 2022 upon the satisfaction of certain milestones, and (iii) the assumed debt of $13 million. The debt the Company assumed in the transaction was repaid in June 2020. The operating results of SUSN are included in the results of the Company's Performance Chemicals segment.

Divestitures

Divestitures	12 Months Ended
	Sep. 30, 2022
Discontinued Operations And Disposal Groups [Abstract]
Divestitures	Note D. Divestitures Sale of Purification Solutions Business On March 1, 2022, the Company completed the sale of its Purification Solutions business, a reporting segment of the Company, to an affiliate of funds advised by One Equity Partners for total expected cash proceeds of approximately $89 million, net of $7 million cash transferred. Upon completion of the sale, the Company received net cash proceeds of $79 million and recorded a receivable for $10 million, which are subject to customary post-closing adjustments. The $10 million receivable is included in Accounts and notes receivable on the Consolidated Balance Sheet at September 30, 2022. The Company expects to settle this receivable in fiscal 2023. The Company recognized a pre-tax impairment charge of $197 million during the first quarter of fiscal 2022 . Sale of Marshall Mine In September 2020, the Company entered into an agreement to sell its lignite mine located in Marshall, Texas to ADA Carbon Solutions, LLC (“ADACS”) for a nominal amount. As part of the transaction, the Company agreed to fund a portion of the costs ADACS expects to incur to close the mine. Additionally, in conjunction with the sale of the mine, the Purification Solutions business entered into a long-term supply agreement with ADACS, a producer of lignite-based activated carbon, which included an agreement for the Company to fund certain capital expenditures. These liabilities totaled $11 million, which the Company settled in full with ADACS during the second quarter of fiscal 2022 in connection with the sale of the Purification Solutions business.

Inventories

Inventories	12 Months Ended
	Sep. 30, 2022
Inventory Disclosure [Abstract]
Inventories	Note E. Inventories Inventories, net of obsolete, unmarketable and slow moving reserves, are as follows: September 30 2022 2021 (In millions) Raw materials $ 182 $ 168 Finished goods 427 300 Other (1) 55 55 Total $ 664 $ 523 (1) Other inventory is comprised of certain spare parts and supplies. At September 30, 2022 and 2021, total inventory reserves were $ 9

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Sep. 30, 2022
Property Plant And Equipment [Abstract]
Property, Plant and Equipment	Note F. Property, Plant and Equipment Property, plant and equipment consists of the following: September 30 2022 2021 (In millions) Land and land improvements $ 75 $ 114 Buildings 553 575 Machinery and equipment 2,473 2,765 Other 229 241 Construction in progress 224 190 Total property, plant and equipment 3,554 3,885 Less: Accumulated depreciation (2,284 ) (2,509 ) Net property, plant and equipment $ 1,270 $ 1,376 Depreciation expense for fiscal 2022, 2021, and 2020 was $140 million, $152 million and $151 million, respectively.

Goodwill and Intangible Assets

Goodwill and Intangible Assets	12 Months Ended
	Sep. 30, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	Note G. Goodwill and Intangible Assets The carrying amount of goodwill attributable to each reportable segment with goodwill balances and the changes in those balances during the fiscal year ended September 30, 2022 are as follows: Reinforcement Materials Performance Chemicals Total (In millions) Balance at September 30, 2021 (1) $ 48 $ 92 $ 140 Foreign currency impact (2 ) (9 ) (11 ) Balance at September 30, 2022 $ 46 $ 83 $ 129 (1) The balance as of September 30, 2021 included $444 million of accumulated impairment losses associated with the goodwill of Purification Solutions segment. The following table provides information regarding the Company’s intangible assets with finite lives: September 30, 2022 September 30, 2021 Gross Carrying Value Accumulated Amortization Net Intangible Assets Gross Carrying Value Accumulated Amortization Net Intangible Assets (In millions) Developed technologies $ 34 $ (8 ) $ 26 $ 62 $ (12 ) $ 50 Trademarks 2 (1 ) 1 11 (1 ) 10 Customer relationships 59 (23 ) 36 60 (20 ) 40 Total intangible assets $ 95 $ (32 ) $ 63 $ 133 $ (33 ) $ 100 Intangible assets are amortized over their estimated useful lives, which range between ten and twenty-five years, with a weighted average amortization period of 17 6

Accounts Payable, Accrued Liabi

Accounts Payable, Accrued Liabilities and Other Liabilities	12 Months Ended
	Sep. 30, 2022
Payables And Accruals [Abstract]
Accounts Payable, Accrued Liabilities and Other Liabilities	Note H. Accounts Payable, Accrued Liabilities and Other Liabilities Accounts payable and accrued liabilities included in current liabilities consist of the following: September 30 2022 2021 (In millions) Accounts payable $ 533 $ 480 Accrued employee compensation 66 75 Other accrued liabilities 108 112 Total $ 707 $ 667 Other long-term liabilities consist of the following: September 30 2022 2021 (In millions) Employee benefit plan liabilities $ 51 $ 80 Operating lease liabilities 83 84 Other accrued liabilities 100 115 Total $ 234 $ 279

Debt and Other Obligations

Debt and Other Obligations	12 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Debt and Other Obligations	Note I. Debt and Other Obligations Short-term Borrowings Commercial Paper — The Company has a commercial paper program and the maximum aggregate balance of commercial paper notes outstanding and the amounts borrowed under the revolving credit facility may not exceed the borrowing capacity of $1 billion under the revolving credit facility. The proceeds from the issuance of the commercial paper have been used for general corporate purposes, which may include working capital, refinancing existing indebtedness, capital expenditures, share repurchases, and acquisitions. The revolving credit facility is available to repay the outstanding commercial paper, if necessary. There was an outstanding balance of commercial paper of $322 million as of September 30, 2022 with a weighted average interest rate of 3.35% and an outstanding balance of $71 million as of September 30, 2021 with a weighted average interest rate of 0.15%. Line of credit — Cabot’s subsidiary in China entered into a short-term line of credit with a fixed interest rate of 3.7% to support the working capital needs at its Xingtai facility. The outstanding balance as of September 30, 2022 was $25 million. This line of credit was established March 1, 2022 and matures February 28, 2023. Long-term Obligations The Company’s long-term obligations, the fiscal year in which they mature and their respective interest rates are summarized below: September 30 2022 2021 (In millions) Variable Rate Debt: Revolving Credit Facility, expires fiscal 2026 $ — $ — Revolving Credit Facility - Euro, expires fiscal 2024 114 134 Total variable rate debt 114 134 Fixed Rate Debt: 3.7% Notes due fiscal 2022 — 350 3.4% Notes due fiscal 2026 250 250 4.0% Notes due fiscal 2029 300 300 5.0% Notes due fiscal 2032 400 — Medium Term Notes: Notes due fiscal 2022, 8.34% — 8.47% — 15 Notes due fiscal 2028, 6.57% — 7.28% 8 8 Total Medium Term Notes 8 23 Chinese Renminbi Debt, due fiscal 2023, 4.35% 4 4 Total fixed rate debt 962 927 Finance lease obligations (Note R) 29 33 Unamortized debt issuance costs and debt discount (9 ) (4 ) Total debt 1,096 1,090 Less current portion of long-term debt (7 ) (373 ) Total long-term debt $ 1,089 $ 717 Revolving Credit Facility, expiring fiscal 2026 — In August 2021, the Company entered into a revolving credit agreement (the “U.S. Credit Agreement”) with a loan commitment not to exceed $1 billion. The U.S. Credit Agreement supports the Company’s issuance of commercial paper, and borrowings under it may be used for working capital, letters of credit and other general corporate purposes. Outstanding commercial paper balances reduce the amount available for borrowing under the U.S. Credit Agreement, which was $678 million as of September 30, 2022. The U.S. Credit Agreement, which matures on August 6, 2026, subject to a one one-year The borrowing rate is currently based on LIBOR, plus a Cabot-specific spread based on the Company’s credit rating and achievement on the annual sustainability performance targets. As a result of meeting the annual sustainability performance targets, the commitment fee and borrowing rate will be reduced by 0.01% and 0.05%, respectively, effective from August 2022 through August 2023. Revolving Credit Facility-Euro, expiring fiscal 202 4 —In May 2019, several subsidiaries entered into a revolving credit agreement (the “Euro Credit Agreement”) with a loan commitment not to exceed 300 million Euros. The amount available for borrowing under this revolving credit agreement was $ 178 million as of September 30, 20 2 2 , and the weighted average interest rate on the outstanding balance during the year was 1.82 % . The borrowing rate is current ly based on LIBOR, plus a Cabot- specific spread based on the Company’s credit rating. The revolving credit agreement, which matures on the earlier of (i) May 22, 2024 and (ii) the date of maturity, termination or expiration of the c orporate revolving credit facility, may be used for repatriation of earnings of Cabot’s foreign subsidiaries to the U.S., the repayment of indebtedness of the Company’s foreign subsidiaries owing to the Company or any of its subsidiaries, and for working capital and general corporate purposes. The obligations of the subsidiaries under the revolving credit agreement are guaranteed by the Company. The Company paid debt issuance costs of $ 1 million upon entering the agreement, which are being amortized over the life of the revolver. Effective October 19, 2021, the same subsidiaries amended and restated the Euro Credit Agreement to align with the customary LIBOR replacement language and the financial leverage test covenant adopted in the U.S. Credit Agreement. The amount of the loan commitment, maturity date, acceptable use of funds, and guarantee by the Company are unchanged from the prior agreement. Debt Covenants — As of September 30, 2022, Cabot was in compliance with the financial debt covenants under the Credit Agreements, which, with limited exceptions, require us to comply on a quarterly basis with a leverage test requiring the ratio of consolidated net debt to consolidated EBITDA not to exceed 3.50 to 1.00. Consolidated net debt is defined as consolidated debt offset by the lessor of (i) unrestricted cash and cash equivalents and (ii) $150 million. Chinese Renminbi Debt —The Company’s consolidated Chinese subsidiaries had $4 million of unsecured long-term debt outstanding with a noncontrolling shareholder of a consolidated subsidiary as of both September 30, 2022 and 2021. 3.7% Notes due fiscal 2022 —In June 2022, Cabot settled $350 million in unsecured notes with a coupon of 3.7% that were scheduled to mature on July 15, 2022. 3.4% Notes due fiscal 2026 —In September 2016, Cabot issued $250 million in registered notes with a coupon of 3.4% that mature on September 15, 2026. These notes are unsecured and pay interest on March 15 and September 15. The net proceeds of this offering were $248 million after deducting discounts and issuance costs. The discount of less than $1 million was recorded at issuance and is being amortized over the life of the notes. 4.0% Notes due fiscal 2029 —In June 2019, Cabot issued $300 million in registered, unsecured, notes with a coupon of 4.0% that mature on July 1, 2029. Interest is payable under the notes semi-annually on January 1 and July 1. The net proceeds of this offering were $296 million after deducting discounts and issuance costs of $1 million and $3 million, respectively, which were paid at issuance and are being amortized over the life of the notes. 5.0% Notes due fiscal 2032 —In June 2022, Cabot issued $400 million in unsecured notes with a coupon of 5% that mature on June 30, 2032. Interest is payable semi-annually on June 30 and December 30, commencing on December 30, 2022. The net proceeds of this offering were $394 million after deducting discounts and issuance costs, each of which were $3 million, which were paid at issuance and are being amortized over the life of the notes. Medium Term Notes —At September 30, 2022 and 2021, there were $ 8 million and $23 million, respectively, of unsecured medium term notes outstanding issued to numerous lenders with various fixed interest rates and maturity dates. The weighted average maturity of the total outstanding medium term notes is 5 years 7.24 %. Finance Lease obligations —See Note R for a discussion of the Company’s leases. Future Years Payment Schedule The aggregate principal amounts of long-term debt, excluding finance lease liabilities presented separately in Note R, due in each of the five years from fiscal 2023 through 2027 and thereafter are as follows: Years Ending September 30 Principal Payments on Long-Term Debt (In millions) 2023 $ 4 2024 114 2025 — 2026 250 2027 — Thereafter 708 Total $ 1,076 Standby letters of credit —At September 30, 2022, the Company had provided standby letters of credit that were outstanding and not drawn totaling $ 7 million, which expire through fiscal 2024.

Financial Instruments and Fair

Financial Instruments and Fair Value Measurements	12 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Financial Instruments and Fair Value Measurements	Note J. 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 fiscal 2022 or 2021. At both September 30, 2022 and 2021, 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. Each of these financial asset and liability categories is classified as Level 1 within the fair value hierarchy. At both September 30, 2022 and 2021, Cabot had derivatives relating to foreign currency risks carried at fair value. At September 30, 2022 and 2021, the fair value of these derivatives was a net asset of $ 28 At September 30, 2022 and 2021, the fair value of Guaranteed investment contracts, included in Other assets on the Consolidated Balance Sheets, was $ 8 The carrying value and fair value of the long-term fixed rate debt were $ 1.08 1.06

Derivatives

Derivatives	12 Months Ended
	Sep. 30, 2022
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivatives	Note K. Derivatives Risk Management Cabot’s business operations are exposed to changes in interest rates, foreign currency exchange rates and commodity prices because Cabot finances certain operations through long and short-term borrowings, denominates transactions in a variety of foreign currencies and purchases certain commoditized raw materials. Changes in these rates and prices may have an impact on future cash flows and earnings. The Company manages these risks through normal operating and financing activities and, when deemed appropriate, through the use of derivative financial instruments. The Company has policies governing the use of derivative instruments and does not enter into financial instruments for trading or speculative purposes. By using derivative instruments, Cabot is subject to credit and market risk. If a counterparty fails to fulfill its performance obligations under a derivative contract, Cabot’s credit risk will equal the fair value of the derivative. Generally, when the fair value of a derivative contract is positive, the counterparty owes Cabot, thus creating a payment risk for Cabot. The Company minimizes counterparty credit (or repayment) risk by entering into transactions with major financial institutions of investment grade credit rating. Cabot’s exposure to market risk is not hedged in a manner that completely eliminates the effects of changing market conditions on earnings or cash flow. No significant concentration of credit risk existed at September 30, 2022 and 2021. Interest Rate Risk Management Cabot’s objective is to maintain a certain fixed-to-variable interest rate mix on the Company’s debt obligations. Cabot may enter into interest rate swaps as a hedge of the underlying debt instruments to effectively change the characteristics of the interest rate without changing the debt instrument. As of both September 30, 2022 and 2021, there were no derivatives held to manage interest rate risk. Foreign Currency Risk Management Cabot’s international operations are subject to certain risks, including currency exchange rate fluctuations and government actions. Cabot endeavors to match the currency in which debt is issued to the currency of the Company’s major, stable cash receipts. In some situations, Cabot has issued debt denominated in U.S. dollars and then entered into cross-currency swaps that exchange the dollar principal and interest payments into Euro denominated principal and interest payments. Additionally, the Company has foreign currency exposure arising from its net investments in foreign operations. Cabot may enter into cross-currency swaps to mitigate the impact of currency rate changes on the Company’s net investments. The Company also has foreign currency exposure arising from the denomination of monetary assets and liabilities in foreign currencies other than the functional currency of a given subsidiary as well as the risk that currency fluctuations could affect the dollar value of future cash flows generated in foreign currencies. Accordingly, Cabot uses short-term forward contracts to minimize the exposure to foreign currency risk. In certain situations where the Company has forecasted purchases under a long-term commitment or forecasted sales denominated in a foreign currency, Cabot may enter into appropriate financial instruments in accordance with the Company’s risk management policy to hedge future cash flow exposures. The following table provides details of the derivatives held as of September 30, 2022 and 2021 to manage foreign currency risk. Notional Amount Description Borrowing September 30, 2022 September 30, 2021 Hedge Designation Cross Currency Swaps 3.4% Notes USD 250 million swapped to EUR 223 million USD 250 million swapped to EUR 223 million Net investment Forward Foreign Currency Contracts (1) N/A USD 42 million USD 48 million No designation (1) At both September 30, 2022 and 2021, Cabot’s forward foreign exchange contracts were denominated in Indonesian rupiah and Czech koruna. Accounting for Derivative Instruments and Hedging Activities The Company determines the fair value of financial instruments using quoted market prices whenever available. When quoted market prices are not available for various types of financial instruments (such as forwards, options and swaps), the Company uses standard models with market-based inputs, which take into account the present value of estimated future cash flows and the ability of Cabot or the financial counterparty to perform. For interest rate and cross-currency swaps, the significant inputs to these models are interest rate curves for discounting future cash flows and are adjusted for credit risk. For forward foreign currency contracts, the significant inputs are interest rate curves for discounting future cash flows, and exchange rate curves of the foreign currency for translating future cash flows. Fair Value Hedge For derivative instruments that are designated and qualify as fair value hedges, the gain or loss on the derivative as well as the offsetting gain or loss on the hedged item attributable to the hedged risk are recognized in current period earnings. Cash Flow Hedge For derivative instruments that are designated and qualify as cash flow hedges, the effective portion of the gain or loss on the derivative is recorded in AOCI and reclassified to earnings in the same period or periods during which the hedged transaction affects earnings. Gains and losses on the derivative representing either hedge ineffectiveness or hedge components excluded from the assessment of effectiveness are recognized in current period earnings. Net Investment Hedge For net investment hedges, changes in the fair value of the effective portion of the derivatives’ gains or losses are reported as CTA in AOCI while changes in the ineffective portion are reported in earnings. Effectiveness is assessed based on the hypothetical derivative method. The gains or losses on derivative instruments reported in AOCI are reclassified to earnings in the period in which earnings are affected by the underlying item, such as a disposal or substantial liquidations of the entities being hedged. The Company has cross-currency swaps with a notional amount of $250 million, which are designated as hedges of its net investments in certain Euro denominated subsidiaries. Cash settlements occur semi-annually on March 15 th th 3 29 32 The following table summarizes the impact of the cross-currency swaps to AOCI and the Consolidated Statements of Operations: Years Ended September 30 2022 2021 2020 2022 2021 2020 2022 2021 2020 Description Gain/(Loss) Recognized in AOCI (Gain)/Loss Reclassified from AOCI into Interest Expense in the Consolidated Statements of Operations (Gain)/Loss Recognized in Interest Expense in the Consolidated Statements of Operations (Amount Excluded from Effectiveness Testing) (In millions) Cross-currency swaps $ 30 $ 7 $ 1 $ (6 ) $ (5 ) $ (5 ) $ 2 $ 2 $ 2 Other Derivative Instruments From time to time, the Company may enter into certain derivative instruments that may not be designated as hedges for accounting purposes, which may include cross-currency swaps, foreign currency forward contracts and commodity derivatives. For cross-currency swaps and foreign currency forward contracts not designated as hedges, the Company uses standard models with market-based inputs. The significant inputs to these models are interest rate curves for discounting future cash flows, and exchange rate curves of the foreign currency for translating future cash flows. In determining the fair value of the commodity derivatives, the significant inputs to valuation models are quoted market prices of similar instruments in active markets. Although these derivatives do not qualify for hedge accounting, Cabot believes that such instruments are closely correlated with the underlying exposure, thus managing the associated risk. The gains or losses from changes in the fair value of derivative instruments that are not accounted for as hedges are recognized in current period earnings. At September 30, 2022, the fair value of derivative instruments not designated as hedges was less than $1 million and was presented in Accounts payable and accrued liabilities on the Consolidated Balance Sheets. At September 30, 2021, the fair value of derivative instruments not designated as hedges was less than $1 million and was presented in Prepaid expenses and other current assets and Accounts payable and accrued liabilities on the Consolidated Balance Sheets.

Insurance Recoveries

Insurance Recoveries	12 Months Ended
	Sep. 30, 2022
Insurance Recovery [Abstract]
Insurance Recoveries	Note L. Insurance Recoveries Pepinster, Belgium In July 2021, the Company’s Specialty Compounds manufacturing and research and development facility in Pepinster, Belgium experienced significant flooding. Full production, which was temporarily halted, resumed in the second quarter of fiscal 2022. During fiscal 2021, the Company recorded expenses of $17 million for clean-up costs, inventory, and fixed asset impairments and simultaneously recognized a fully offsetting loss recovery from expected insurance proceeds. During fiscal 2022, the Company recorded additional expenses of $6 million, primarily related to additional clean-up costs, and simultaneously recognized a fully offsetting loss recovery from expected insurance proceeds as the Company expects insurance proceeds in excess of the total incurred costs and policy deductibles. The flood-related expenses and loss recoveries are both included within Cost of sales in the Consolidated Statements of Operations in fiscal 2021 and 2022 During fiscal 2022 and 2021, the Company received insurance proceeds of $11 million and $8 million, respectively. In fiscal 2022, this amount included $10 million in Cash provided by operating activities and $ million in Cash provided by investing activities in the Consolidated Statements of Cash Flows. In fiscal 2021, this amount included $ million in Cash provided by operating activities and $2 million in Cash provided by investing activities in the Consolidated Statements of Cash Flows. At September 30, 2022 and 2021, the receivable for insurance recoveries was $ and $9 million, respectively, and is included in Prepaid expenses and other current assets on the Consolidated Balance Sheet. Franklin, Louisiana In August 2021, the Company’s specialty carbons and reinforcing carbons manufacturing facility in Franklin, Louisiana experienced an unplanned plant outage due to equipment failure. During fiscal 2022, the Company received insurance proceeds of $8 million for business interruption. These proceeds were included within Cost of sales in the Consolidated Statements of Operations and in Cash Provided by operating activities in the Consolidated Statements of Cash Flows for the fiscal year ended September 30, 2022.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Sep. 30, 2022
Compensation And Retirement Disclosure [Abstract]
Employee Benefit Plans	Note M. Employee Benefit Plans The information below provides detail concerning the Company’s benefit obligations under the defined benefit and postretirement benefit plans it sponsors. Defined benefit plans provide pre-determined benefits to employees that are distributed upon retirement. Cabot is making all sponsor required contributions to these plans. The accumulated benefit obligation was $2 million for the U.S. defined benefit plan and $ 125 The following provides information about projected benefit obligations, plan assets, the funded status and weighted-average assumptions of the defined benefit pension and postretirement benefit plans: Years Ended September 30 2022 2021 2022 2021 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Change in Benefit Obligations: Benefit obligation at beginning of year $ 3 $ 221 $ 99 $ 231 $ 25 $ 19 $ 27 $ 20 Service cost — 4 — 6 — — — — Interest cost — 4 — 3 — 1 — 1 Plan participants’ contribution — 1 — 1 — — — — Foreign currency exchange rate changes — (27 ) — 6 — (2 ) — 1 (Gain) loss from changes in actuarial assumptions and plan experience (1 ) (43 ) (1 ) (11 ) (4 ) (5 ) — (2 ) Benefits paid — (9 ) (3 ) (8 ) (3 ) — (2 ) (1 ) Settlements or curtailments — (2 ) (92 ) (8 ) (2 ) — — — Divestiture of a business — (16 ) — — — — — — Other — — — 1 — — — — Benefit obligation at end of year $ 2 $ 133 $ 3 $ 221 $ 16 $ 13 $ 25 $ 19 Years Ended September 30 2022 2021 2022 2021 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Change in Plan Assets: Fair value of plan assets at beginning of year $ — $ 217 $ 96 $ 204 $ — $ — $ — $ — Actual return on plan assets — (35 ) 1 14 — — — — Employer contribution — 5 — 7 5 — 2 1 Plan participants’ contribution — 1 — 1 — — — — Foreign currency exchange rate changes — (24 ) — 7 — — — — Benefits paid — (9 ) (3 ) (8 ) (3 ) — (2 ) (1 ) Settlements or curtailments — (2 ) (92 ) (8 ) (2 ) — — — Expenses paid from assets — — — — — — — — Divestiture of a business — (18 ) — — — — — — Other — — (2 ) — — — — — Fair value of plan assets at end of year $ — $ 135 $ — $ 217 $ — $ — $ — $ — Funded status $ (2 ) $ 2 $ (3 ) $ (4 ) $ (16 ) $ (13 ) $ (25 ) $ (19 ) Recognized asset (liability) $ (2 ) $ 2 $ (3 ) $ (4 ) $ (16 ) $ (13 ) $ (25 ) $ (19 ) Pension Assumptions and Strategy The following assumptions were used to determine the pension benefit obligations and periodic benefit costs as of and for the years ended September 30: 2022 2021 2020 Pension Benefits U.S. Foreign U.S. Foreign U.S. Foreign Actuarial assumptions as of the year-end measurement date: Discount rate 5.5 % 4.5 % 2.2 % 2.1 % 3.1 % 1.7 % Rate of increase in compensation 3.0 % 3.0 % N/A 2.9 % N/A 3.0 % Cash balance interest credit rate 2.0 % 2.0 % 2.0 % 1.7 % 0.9 % 1.7 % Actuarial assumptions used to determine net periodic benefit cost during the year: Discount rate - benefit obligation 2.2 % 2.1 % 2.5 % 1.7 % 2.6 % 1.8 % Discount rate - service cost N/A 2.0 % N/A 1.7 % N/A 1.8 % Discount rate - interest cost 1.6 % 1.7 % 1.4 % 1.4 % 2.6 % 1.6 % Expected long-term rate of return on plan assets N/A 3.5 % N/A 4.6 % 2.5 % 5.2 % Rate of increase in compensation N/A 2.9 % N/A 3.0 % N/A 3.0 % Cash balance interest credit rate 2.0 % 1.7 % 2.1 % 1.7 % 0.9 % 1.9 % Postretirement Assumptions and Strategy The following assumptions were used to determine the postretirement benefit obligations and net costs as of and for the years ended September 30: 2022 2021 2020 Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign Actuarial assumptions as of the year-end measurement date: Discount rate 5.6 % 5.1 % 2.4 % 2.8 % 2.1 % 2.4 % Initial health care cost trend rate (1) — % 6.8 % 5.5 % 6.9 % 6.0 % 6.9 % Actuarial assumptions used to determine net cost during the year: Discount rate - benefit obligation 2.4 % 2.8 % 2.1 % 2.4 % 2.9 % 2.4 % Discount rate - service cost 1.7 % 3.5 % 1.5 % 3.0 % 2.6 % 2.9 % Discount rate - interest cost 1.6 % 2.5 % 1.4 % 2.1 % 2.5 % 2.3 % Initial health care cost trend rate 5.5 % 6.9 % 6.0 % 6.9 % 6.5 % 6.9 % (1) Cabot uses discount rates as of September 30, the plans’ measurement date, to determine future benefit obligations under its U.S. and foreign defined benefit plans. The discount rates for the defined benefit plans in Canada, the Eurozone, Japan, Switzerland, the United Arab Emirates, the United Kingdom and the U.S. are derived from yield curves that reflect high quality corporate bond yield or swap rate information in each region and reflect the characteristics of Cabot’s employee benefit plans. The discount rates for the defined benefit plans in Mexico, the Czech Republic and Indonesia are based on government bond indices that best reflect the durations of the plans, adjusted for credit spreads presented in selected AA corporate bond indices. The rates utilized are selected because they represent long-term, high quality, fixed income benchmarks that approximate the long-term nature of Cabot’s pension obligations and related payouts. Amounts recognized in the Consolidated Balance Sheets at September 30, 2022 and 2021 related to the Company's defined benefit pension and postretirement benefit plans were as follows: September 30 2022 2021 2022 2021 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Other assets $ — $ 26 $ — $ 35 $ — $ — $ — $ — Accounts payable and accrued liabilities $ — $ (1 ) $ (1 ) $ (1 ) $ (2 ) $ (1 ) $ (3 ) $ (1 ) Other liabilities $ (2 ) $ (23 ) $ (2 ) $ (38 ) $ (14 ) $ (12 ) $ (22 ) $ (18 ) Amounts recognized in AOCI at September 30, 2022 and 2021 related to the Company's defined benefit pension and postretirement benefit plans were as follows: September 30 2022 2021 2022 2021 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Net actuarial (gain) loss $ — $ 23 $ 1 $ 20 $ (6 ) $ (4 ) $ (4 ) $ 2 Net prior service credit — (1 ) — — — — — — Balance in accumulated other comprehensive (income) loss, pretax $ — $ 22 $ 1 $ 20 $ (6 ) $ (4 ) $ (4 ) $ 2 Estimated Future Benefit Payments The Company expects that the following benefit payments will be made to plan participants in the years from 2023 to 2032: Pension Benefits Postretirement Benefits Years Ending September 30 U.S. Foreign U.S. Foreign (In millions) 2023 $ — $ 8 $ 2 $ 1 2024 $ — $ 10 $ 2 $ 1 2025 $ — $ 9 $ 2 $ 1 2026 $ — $ 9 $ 2 $ 1 2027 $ — $ 10 $ 2 $ 1 2028 - 2032 $ 1 $ 47 $ 6 $ 4 Postretirement medical benefits are unfunded and impact Cabot’s cash flows as benefits become due, which is expected to be $3 million in fiscal 2023. The Company expects to contribute $ 4 Net periodic defined benefit pension and other postretirement benefit costs include the following components: Years Ended September 30 2022 2021 2020 2022 2021 2020 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Service cost $ — $ 4 $ — $ 6 $ 1 $ 5 $ — $ — $ — $ — $ — $ — Interest cost — 4 — 3 4 3 — 1 — 1 1 — Expected return on plan assets — (6 ) — (10 ) (3 ) (9 ) — — — — — — Amortization of net losses — 1 — 3 — 3 — — — — (1 ) 1 Settlements or Curtailments cost — — 4 1 3 1 (1 ) — — — — — Other — — — 2 — — — — — — — — Net periodic (benefit) cost $ — $ 3 $ 4 $ 5 $ 5 $ 3 $ (1 ) $ 1 $ — $ 1 $ — $ 1 Other changes in plan assets and benefit obligations recognized in Other comprehensive income (loss) are as follows: Years Ended September 30 2022 2021 2020 2022 2021 2020 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Net (gains) losses $ — $ (2 ) $ (2 ) $ (15 ) $ (4 ) $ 8 $ (4 ) $ (4 ) $ — $ (2 ) $ 1 $ (1 ) Prior service (credit) cost — — — (1 ) — — — — — — — — Amortization of prior unrecognized loss — (1 ) — (3 ) — (3 ) — — — — 1 (1 ) Loss on divestiture — (2 ) — — — — — — — — (Loss) gain on settlements — — (4 ) (1 ) (3 ) (1 ) 1 — — — — — Net changes recognized in Total other comprehensive (income) loss (1) $ — $ (5 ) $ (6 ) $ (20 ) $ (7 ) $ 4 $ (3 ) $ (4 ) $ — $ (2 ) $ 2 $ (2 ) (1) The tax impact on pension and other postretirement benefit liability adjustments arising during the period was a tax benefit of $3 million, a tax benefit of $8 million, and a tax provision of less than $1 million for fiscal 2022, 2021, and 2020 Plan Assets The Company’s foreign defined benefit pension plans weighted-average asset allocations at September 30, 2022 and 2021 by asset category, are as follows: September 30 2022 2021 Equity securities 20 % 21 % Debt securities 68 % 73 % Real estate 7 % 2 % Cash and other securities 5 % 4 % Total 100 % 100 % To develop the expected long-term rate of return on plan assets assumption, the Company used a capital asset pricing model. The model considers the current level of expected returns on risk-free investments comprised of government bonds, the historical level of the risk premium associated with the other asset classes in which the portfolio is invested, and the expectations for future returns for each asset class. The expected return for each asset class was then weighted based on the target asset allocation to develop the expected long-term rate of return for each plan. Cabot’s investment strategy for each of its foreign defined benefit plans is generally based on a set of investment objectives and policies that cover time horizons and risk tolerance levels consistent with plan liabilities. Periodic studies are performed to determine the asset mix that will meet pension obligations at a reasonable cost to the Company. The assets of the defined benefit plans are comprised principally of investments in equity and high-quality fixed income securities, which are broadly diversified across the capitalization and style spectrum and are managed using both active and passive strategies. The weighted average target asset allocation for the foreign plans is 18% in equity, 67% in fixed income, 11% in real estate, and 4% in cash and other securities. For pension plan assets classified as Level 1 measurements (measured using quoted prices in active markets), total fair value is either the price of the most recent trade at the time of the market close or the official close price, as defined by the exchange on which the asset is most actively traded on the last trading day of the period, multiplied by the number of units held without consideration of transaction costs. For pension plan assets classified as Level 2 measurements, where the security is frequently traded in less active markets, fair value is based on the closing price at the end of the period; where the security is less frequently traded, fair value is based on the price a dealer would pay for the security or similar securities, adjusted for any terms specific to that asset or liability. Market inputs are obtained from well-established and recognized vendors of market data and subjected to tolerance/quality checks. The fair value of the Company’s pension plan assets at September 30, 2022 and 2021 by asset category is as follows: September 30 2022 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Total (In millions) Cash $ 1 $ — $ 1 $ — $ — $ — Direct investments: U.S government bonds — — — — — — U.S. corporate bonds — — — — — — Non-U.S. equities 4 — 4 4 — 4 Non-U.S. government bonds 1 — 1 2 — 2 Non-U.S. corporate bonds 2 — 2 3 — 3 Mortgage backed securities — 1 1 — 1 1 Other fixed income 1 — 1 1 — 1 Total direct investments 8 1 9 10 1 11 Investment funds: Equity funds (1) — 23 23 — 42 42 Fixed income funds (2) — 86 86 — 155 155 Real estate funds (3) — 9 9 — 3 3 Cash equivalent funds 1 — 1 1 — 1 Other investment funds — 1 1 — — — Total investment funds 1 119 120 1 200 201 Alternative investments: Insurance contracts (4) — 5 5 — 5 5 Other alternative investments — — — — — — Total alternative investments — 5 5 — 5 5 Total pension plan assets $ 10 $ 125 $ 135 $ 11 $ 206 $ 217 (1) The equity funds asset class includes funds that invest in U.S. equities as well as equity securities issued by companies incorporated, listed or domiciled in countries in developed and/or emerging markets. These companies may be in the small-, mid- or large-cap categories. (2) The fixed income funds asset class includes investments in high quality funds. High quality fixed income funds primarily invest in low risk U.S. and non-U.S. government securities, investment-grade corporate bonds, mortgages and asset-backed securities. A significant portion of the fixed income funds include investment in long-term bond funds. (3) The real estate funds asset class includes funds that primarily invest in entities which are principally engaged in the ownership, acquisition, development, financing, sale and/or management of income-producing real estate properties, both commercial and residential. These funds typically seek long-term growth of capital and current income that is above average relative to public equity funds. (4) Insurance contracts held by the Company’s non-U.S. plans are issued by well-known, highly rated insurance companies. Defined Contribution Plans In addition to benefits provided under the defined benefit and postretirement benefit plans, the Company provides benefits under defined contribution plans. Cabot recognized expenses related to these plans of $15 million in fiscal 2022, $18 million in fiscal 2021, and $19 million in fiscal 2020.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Sep. 30, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	Note N. Stock-Based Compensation The Cabot Corporation Amended and Restated 2017 Long-Term Incentive Plan (the “Amended Plan”) was established by the Company to provide stock-based compensation to eligible employees. The Amended Plan was approved by Cabot’s stockholders on March 11, 2021 and authorizes the issuance of up to 8,625,000 shares of common stock. It is the only equity incentive plan under which the Company may grant equity awards to employees. The terms of awards made under Cabot’s equity compensation plans are generally determined by the Compensation Committee of Cabot’s Board of Directors. The awards made in fiscal 2022, 2021 and 2020 consist of grants of stock options, time-based restricted stock units, and performance-based restricted stock units. The options were issued with an exercise price equal to 100% of the market price of Cabot’s common stock on the date of grant, generally vest over a three year period (30% on each of the first and second anniversaries of the date of grant and 40% on the third anniversary of the date of grant) and have a ten-year three-year Stock-based employee compensation expense was $ 22 The following table presents stock-based compensation expenses included in the Company’s Consolidated Statements of Operations: Years Ended September 30 2022 2021 2020 (In millions) Cost of sales $ 3 $ 2 $ 1 Selling and administrative expenses 18 17 7 Research and technical expenses 2 2 1 Stock-based compensation expense 23 21 9 Income tax benefit (1 ) (1 ) — Net stock-based compensation expense $ 22 $ 20 $ 9 As of September 30, 2022, Cabot had $ 24 approximately one year Equity Incentive Plan Activity The following table summarizes the total stock option and restricted stock unit activity in the equity incentive plans for fiscal 2022: Stock Options Restricted Stock Units Total Options (4) Weighted Average Exercise Price Restricted Stock Units ( 1) Weighted Average Grant Date Fair Value (Shares in thousands) Outstanding at September 30, 2021 1,476 $ 48.36 859 $ 45.82 Granted 242 $ 58.27 280 $ 58.72 Performance-based adjustment ( 2) — $ — 122 $ 48.66 Exercised / Vested (136 ) $ 47.52 (213 ) $ 49.35 Cancelled / Forfeited (8 ) $ 62.24 (36 ) $ 46.85 Outstanding at September 30, 2022 (3) 1,574 $ 49.89 1,012 $ 48.95 Exercisable at September 30, 2022 923 $ 50.31 (1) The number granted represents the number of shares issuable upon vesting of time-based restricted stock units and performance-based restricted stock units, assuming the Company performs at the target performance level in each year of the three-year performance period. (2) Represents the net incremental number of shares issuable upon vesting of performance-based restricted stock units based on the Company’s actual financial performance metrics for fiscal 2022. (3) Stock options outstanding include options vested and expected to vest in the future and have a weighted average remaining contractual life of 6.81 (4) Unvested stock options were approximately 651,000 49.30 Stock Options As of September 30, 2022, the aggregate intrinsic value for all options outstanding and options exercisable was $22 million. The intrinsic value of options exercised during fiscal 2022, 2021 and 2020 was $4 million 6 The Company uses the Black-Scholes option-pricing model to estimate the fair value of the options at the grant date. The weighted average grant date fair values of options granted during fiscal 2022, 2021 and 2020 was $15.95, $9.69, and $10.68 Years Ended September 30 2022 2021 2020 Expected stock price volatility 35 % 36 % 28 % Risk free interest rate 1.4 % 0.6 % 1.9 % Expected life of options (years) 6 6 6 Expected annual dividends per year $ 1.40 $ 1.40 $ 1.40 The expected stock price volatility assumption was determined using the historical volatility of the Company’s common stock over the expected life of the option. The expected term reflects the anticipated time period between the measurement date and the exercise date or post-vesting cancellation date. Restricted Stock Units The value of restricted stock unit awards is the closing stock price at the date of the grant. The weighted average grant date fair values of restricted stock unit awards granted during fiscal 2022, 2021 and 2020 was $ 58.72 13 Supplemental 401(k) Plan Cabot’s Deferred Compensation and Supplemental Retirement Plan (“SERP 401(k)”) provides benefits to highly compensated employees when the retirement plan limits established under the Internal Revenue Code prevent them from receiving all of the Company matching and retirement contributions that would otherwise be provided under the qualified 401(k) plan. The SERP 401(k) is non-qualified and unfunded. Contributions under the SERP 401(k) are treated as if invested in Cabot common stock. The majority of the distributions made under the SERP 401(k) are required to be paid with shares of Cabot common stock. The remaining distributions, which relate to certain grandfathered accounts, will be paid in cash based on the market price of Cabot common stock at the time of distribution. The aggregate value of the accounts that will be paid out in stock, which is equivalent to approximately 103,000

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Sep. 30, 2022
Stockholders Equity Note [Abstract]
Accumulated Other Comprehensive Income (Loss)	Note O. Accumulated Other Comprehensive Income (Loss) Changes in each component of AOCI, net of tax, are as follows for fiscal 2021 and 2022: Currency Translation Adjustment Pension and Other Postretirement Benefit Liability Adjustment Total (In millions) Balance at September 30, 2020 attributable to Cabot Corporation $ (307 ) $ (44 ) $ (351 ) Other comprehensive income (loss) before reclassifications 52 20 72 Amounts reclassified from AOCI (3 ) — (3 ) Less: Other comprehensive income (loss) attributable to noncontrolling interests 7 — 7 Balance at September 30, 2021 attributable to Cabot Corporation (265 ) (24 ) (289 ) Other comprehensive income (loss) before reclassifications (208 ) 12 (196 ) Amounts reclassified from AOCI 29 2 31 Less: Other comprehensive income (loss) attributable to noncontrolling interests (15 ) — (15 ) Balance at September 30, 2022 attributable to Cabot Corporation $ (429 ) $ (10 ) $ (439 ) The amounts reclassified out of AOCI and into the Consolidated Statements of Operations for fiscal 2022, 2021 and 2020 are as follows: Affected Line Item in the Consolidated Years Ended September 30 Statements of Operations 2022 2021 2020 (In Millions) Derivatives: net investment hedges (Gains) losses reclassified to interest expense Interest expense $ (6 ) $ (5 ) $ (5 ) (Gains) losses excluded from effectiveness testing and amortized to interest expense Interest expense 2 2 2 Release of current translation adjustment Loss on sale of business and asset impairment charge 33 — — Pension and other postretirement benefit liability adjustment Release of actuarial losses and prior service cost (credits) Loss on sale of business and asset impairment charge 2 — — Amortization of actuarial losses and prior service cost (credit) Net Periodic Benefit Cost - see Note M for details 1 3 3 Settlement and curtailment loss (gain) Net Periodic Benefit Cost - see Note M for details (1 ) 5 4 Total before tax $ 31 $ 5 $ 4

Earnings Per Share

Earnings Per Share	12 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Earnings Per Share	Note P. Earnings Per Share The following tables summarize the components of the basic and diluted earnings per common share (“EPS”) computations: Years Ended September 30 2022 2021 2020 (In millions, except per share amounts) Basic EPS: Net income (loss) attributable to Cabot Corporation $ 209 $ 250 $ (238 ) Less: Dividends and dividend equivalents to participating securities 1 1 — Less: Undistributed earnings allocated to participating securities (1) 2 2 — Earnings (loss) allocated to common shareholders (numerator) $ 206 $ 247 $ (238 ) Weighted average common shares and participating securities outstanding 57.4 57.5 57.3 Less: Participating securities (1) 0.9 0.8 0.7 Adjusted weighted average common shares (denominator) 56.5 56.7 56.6 Per share amounts—basic: Net income (loss) attributable to Cabot Corporation $ 3.65 $ 4.35 $ (4.21 ) Diluted EPS: Earnings (loss) allocated to common shareholders $ 206 $ 247 $ (238 ) Plus: Earnings allocated to participating securities 3 3 — Less: Adjusted earnings allocated to participating securities (2) 3 3 — Earnings (loss) available to common shares (numerator) $ 206 $ 247 $ (238 ) Adjusted weighted average common shares outstanding 56.5 56.7 56.6 Effect of dilutive securities: Common shares issuable (3) 0.4 0.1 — Adjusted weighted average common shares (denominator) 56.9 56.8 56.6 Per share amounts—diluted: Net income (loss) attributable to Cabot Corporation $ 3.62 $ 4.34 $ (4.21 ) (1) Participating securities consist of shares underlying all outstanding and achieved performance-based restricted stock units and all unvested time-based restricted stock units. The holders of these units are entitled to receive dividend equivalents payable in cash to the extent dividends are paid on the Company’s outstanding common stock and equal in value to the dividends that would have been paid in respect of the shares underlying such units. Undistributed earnings are the earnings which remain after dividends declared during the period are assumed to be distributed to the common and participating shareholders. Undistributed earnings are allocated to common and participating shareholders on the same basis as dividend distributions. The calculation of undistributed earnings is as follows: Years Ended September 30 2022 2021 2020 (In millions) Calculation of undistributed earnings: Net income (loss) attributable to Cabot Corporation $ 209 $ 250 $ (238 ) Less: Dividends declared on common stock 84 80 80 Less: Dividends and dividend equivalents to participating securities 1 1 — Undistributed earnings (loss) $ 124 $ 169 $ (318 ) Allocation of undistributed earnings: Undistributed earnings (loss) allocated to common shareholders $ 122 $ 167 $ (318 ) Undistributed earnings allocated to participating securities 2 2 — Undistributed earnings (loss) $ 124 $ 169 $ (318 ) (2) Undistributed earnings (loss) 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 (i) assumed exercise of stock options issued under Cabot’s equity incentive plans; and (ii) assumed issuance of shares to employees pursuant to the Company’s Deferred Compensation and Supplemental Retirement Plan. For fiscal 2022, 2021, and 2020, respectively, 214,180, 525,131, and 1,821,018 incremental shares of common stock were excluded from the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive.

Income Taxes

Income Taxes	12 Months Ended
	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Note Q. Income Taxes Income from continuing operations before income taxes and equity in net earnings of affiliated companies was as follows: Years Ended September 30 2022 2021 2020 (In millions) Domestic $ (20 ) $ (73 ) $ (274 ) Foreign 355 479 241 Income from continuing operations before income taxes and equity in earnings of affiliated companies $ 335 $ 406 $ (33 ) Tax provision (benefit) for income taxes consisted of the following: Years Ended September 30 2022 2021 2020 (In millions) U.S. federal and state: Current $ 7 $ 11 $ (1 ) Deferred 2 (1 ) 139 Total 9 10 138 Foreign: Current 135 103 62 Deferred (42 ) 10 (9 ) Total 93 113 53 Provision (benefit) for income taxes $ 102 $ 123 $ 191 The provision ( benefit Years Ended September 30 2022 2021 2020 (In millions) Computed tax expense at the federal statutory rate $ 70 $ 85 $ (7 ) Foreign impact of taxation at different rates, repatriation, valuation allowance, and other 38 8 4 Global Intangible Low Taxed Income (GILTI) 23 18 (4 ) Purification Solutions business divestiture (179 ) — — Impact of the Coronavirus Aid, Relief, and Economic Security ("CARES") Act of 2020 — 10 (10 ) Impact of increase (decrease) in valuation allowance on U.S. deferred taxes 160 (1 ) 228 U.S. and state benefits from research and experimentation activities (2 ) (2 ) (2 ) Provision (settlement) of unrecognized tax benefits 1 1 (7 ) Permanent differences, net 10 7 — State taxes, net of federal effect (19 ) (3 ) (11 ) Provision (benefit) for income taxes $ 102 $ 123 $ 191 Significant components of deferred income taxes were as follows: September 30 2022 2021 (In millions) Deferred tax assets: Deferred expenses $ 10 $ 14 Intangible assets 39 38 Inventory 15 13 Operating lease liability 21 21 Other 32 18 U.S. federal interest expense carryforward 33 24 Pension and other benefits 29 32 Net operating loss carryforwards 224 257 Capital loss carryforwards 137 — Foreign tax credit carryforwards 55 48 R&D credit carryforwards 47 46 Other business credit carryforwards 20 24 Subtotal 662 535 Valuation allowance (580 ) (470 ) Total deferred tax assets $ 82 $ 65 September 30 2022 2021 (In millions) Deferred tax liabilities: Property, plant and equipment $ (59 ) $ (47 ) Right of use asset (21 ) (20 ) Unremitted earnings of non-U.S. subsidiaries (22 ) (18 ) Total deferred tax liabilities $ (102 ) $ (85 ) The Company assesses the available positive and negative evidence to estimate whether sufficient future taxable income will be generated to permit utilization of the existing deferred tax assets. When performing this assessment, the Company looks to the potential future reversal of existing taxable temporary differences, taxable income in carryback years and the feasibility of tax planning strategies and estimated future taxable income. Failure to achieve operating income targets resulting in a cumulative loss may change the Company’s assessment regarding the realization of Cabot’s deferred tax assets, resulting in valuation allowance being recorded against some or all of the Company’s deferred tax assets. The need for a valuation allowance can also be affected by changes to tax laws, changes to statutory tax rates and changes to future taxable income estimates. A valuation allowance represents management’s best estimate of the non-realizable portion of the deferred tax assets. Any adjustments in a valuation allowance would result in an adjustment to income tax expense. In determining the recoverability of its U.S. deferred tax assets, the Company considered its cumulative loss incurred over the three-year period ended September 30, 2022. Such objective negative evidence limits the Company’s ability to consider other subjective evidence, such as its projections for future growth. Given the weight of objectively verifiable historical losses from the Company's U.S. operations, the Company recorded a valuation allowance on all of its U.S. deferred tax assets The valuation allowance increased by $110 million in fiscal 2022 compared to fiscal 2021, primarily due to the tax loss related to the divestiture of the Purification Solutions business. The valuation allowance decreased by $11 million in fiscal 2021 compared to fiscal 2020 primarily due to the expiration of NOLs. After the valuation allowance, approximately $20 million of foreign NOLs and less than $1 million of other tax credit carryforwards remained at September 30, 2022. The benefits of these carryforwards are dependent upon taxable income during the carryforward period in the jurisdictions in which they arose. The following table provides detail surrounding the expiration dates of NOLs, capital loss and other tax credit carryforwards before valuation allowances: Years Ending September 30 NOLs/Capital Losses Credits (In millions) 2023 - 2029 $ 1,142 $ 26 2030 and thereafter 227 94 Indefinite carryforwards 723 2 Total $ 2,092 $ 122 As of September 30, 2022, provisions have not been made for non-U.S. withholding taxes or other applicable taxes on $1,405 million of undistributed earnings of non-U.S. subsidiaries, as these earnings are considered indefinitely reinvested. It is not practicable to calculate the unrecognized deferred tax liability on undistributed earnings. Cabot continually reviews the financial position and forecasted cash flows of its U.S. consolidated group and foreign subsidiaries in order to reaffirm the Company’s intent and ability to continue to indefinitely reinvest earnings of its foreign subsidiaries or whether such earnings will need to be repatriated in the foreseeable future. Such review encompasses operational needs and future capital investments. From time to time, however, the Company’s intentions relative to specific indefinitely reinvested amounts change because of certain unique circumstances. These earnings could become subject to non-U.S. withholding taxes and other applicable taxes if they were remitted to the U.S. Cabot has filed its tax returns in accordance with the tax laws in each jurisdiction and recognizes tax benefits for uncertain tax positions when the position would more likely than not be sustained based on its technical merits and recognizes measurement adjustments when needed. As of September 30, 2022, the total amount of unrecognized tax benefits was $159 million, of which $6 million was recorded in Other liabilities in the Consolidated Balance Sheet, $16 million was offset against deferred tax assets and $137 million related to the character of a portion of the tax loss from the Purification Solutions business divestiture. In addition, accruals of $4 million have been recorded for penalties and interest, as of September 30, 2022. Total penalties and interest recorded in the tax provision in the Consolidated Statements of Operations was $2 million in fiscal 2022 and $1 million in both fiscal 2021 and 2020. If the unrecognized tax benefits were recognized as of September 30, 2022, there would be $22 million favorable impact on the Company’s tax provision before consideration of the impact of the potential need for valuation allowances. A reconciliation of the beginning and ending amount of unrecognized tax benefits for fiscal 2022, 2021 and 2020 is as follows: Years Ended September 30 2022 2021 2020 (In millions) Balance at beginning of the year $ 21 $ 23 $ 27 Additions based on tax positions related to the current year 138 1 2 Additions for tax positions of prior years 2 — 2 Reductions of tax positions of prior years (1 ) (2 ) (1 ) Reductions related to settlements — — (5 ) Reductions from lapse of statute of limitations (1 ) (1 ) (2 ) Balance at end of the year $ 159 $ 21 $ 23 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 further change in the unrecognized tax benefits may 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. We are subject to taxation in the United States and various states and foreign jurisdictions. The 2019 through 2021 tax years generally remain subject to examination by the IRS and various tax years from 2009 through 2021 remain subject to examination by the respective foreign

Leases

Leases	12 Months Ended
	Sep. 30, 2022
Leases [Abstract]
Leases	Note R. Leases The Company determines if an arrangement is a lease at inception. The Company considers a contract to be or to contain a lease if the contract conveys the right to control the use of identified property, plant, or equipment (an identified asset) for a period of time in exchange for consideration. A lease liability is recorded at commencement for the net present value of future lease payments over the lease term. The discount rate used is generally the Company’s estimated incremental borrowing rate based on credit-adjusted and term-specific discount rates, using a third-party yield curve. A right of use (“ROU”) asset is recorded and recognized at commencement at the lease liability amount, including initial direct costs incurred, and is reduced for lease incentives received. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. In the normal course of its business, the Company enters into various leases as the lessee, primarily related to certain transportation vehicles, warehouse facilities, office space, and machinery and equipment. These leases have remaining lease terms between one and seventeen years, some of which may include options to extend the leases for up to fifteen years or options to terminate the leases. The Company’s land leases have remaining lease terms up to seventy-nine years. Some lease arrangements require variable payments that are dependent on usage, output, or index-based adjustments. The Company does not have material variable lease payments. The Company has elected not to recognize short-term leases on the balance sheet for all underlying asset classes. Short-term leases are leases that, at the commencement date, have a lease term of twelve months or less and do not include a purchase option that the Company is reasonably certain to exercise. Short-term leases are expensed on a straight-line basis over the lease term. The components of the Company’s lease costs were as follows: Years Ended September 30 2022 2021 2020 (In millions) Operating lease cost $ 23 $ 25 $ 32 Finance lease cost 6 7 6 Total lease cost $ 29 $ 32 $ 38 Included within operating lease costs are short-term lease costs, which were $5 Supplemental cash flow information related to the Company’s leases was as follows: Years Ended September 30 2022 2021 2020 (In millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 17 $ 20 $ 25 Operating cash flows from finance leases 2 2 2 Financing cash flows from finance leases 4 3 3 Right-of-use assets obtained in exchange for new operating lease liabilities $ 14 $ 6 $ 14 Right-of-use assets obtained in exchange for new finance lease liabilities $ 1 $ 4 $ 24 Supplemental balance sheet information related to the Company’s leases was as follows: Description Balance Sheet Classification September 30, 2022 September 30, 2021 (In millions) Lease ROU assets: Operating Other assets $ 96 $ 90 Finance Net property, plant and equipment 41 44 Total lease ROU assets $ 137 $ 134 Lease liabilities: Current: Operating Accounts payable and accrued liabilities $ 14 $ 14 Finance Current portion of long-term debt 3 4 Long-term: Operating Other liabilities 83 84 Finance Long-term debt 26 29 Total lease liabilities $ 126 $ 131 The following table presents the weighted-average remaining lease term and discount rates for the Company’s leases: Description September 30, 2022 September 30, 2021 Weighted-average remaining lease term (years): Operating leases 15 17 Finance leases 10 11 Weighted-average discount rate: Operating leases 2.97 % 2.41 % Finance leases 5.40 % 5.76 % Future minimum lease payments under non-cancelable operating and finance leases as of September 30, 2022 were as follows: Years Ended September 30 Operating leases Finance leases (In millions) 2023 $ 16 $ 5 2024 14 4 2025 13 4 2026 11 4 2027 10 3 2028 and thereafter 51 16 Total lease payments 115 36 Less: imputed interest 18 7 Total $ 97 $ 29

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Sep. 30, 2022
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note S. Commitments and Contingencies Other Long-Term Commitments Cabot has entered into long-term purchase agreements primarily for the purchase of raw materials. Under certain of these agreements, the quantity of material being purchased is fixed, but the price paid changes as market prices change. Raw materials purchased under these agreements were $512 million, $405 million and $258 million during fiscal 2022, 2021 and 2020, respectively. Included in those raw materials purchased are purchases from noncontrolling shareholders of consolidated subsidiaries of $235 million, $135 million and $81 million during fiscal 2022, 2021 and 2020, respectively. Accounts payable and accrued liabilities owed to noncontrolling shareholders as of September 30, 2022 and 2021, were $31 million and $14 million, respectively. For these purchase commitments, the amounts included in the table below are based on market prices as of September 30, 2022 which may differ from actual market prices at the time of purchase. Payments Due by Fiscal Year 2023 2024 2025 2026 2027 Thereafter Total (In millions) Reinforcement Materials $ 251 $ 202 $ 201 $ 201 $ 186 $ 1,727 $ 2,768 Performance Chemicals 43 42 36 35 35 233 $ 424 Total $ 294 $ 244 $ 237 $ 236 $ 221 $ 1,960 $ 3,192 The Company has also entered into long-term purchase agreements primarily for services related to information technology, which are not included in the table above, that total $ 26 Guarantee Agreements Cabot has provided certain indemnities pursuant to which it may be required to make payments to an indemnified party in connection with certain transactions and agreements. In connection with certain acquisitions and divestitures, Cabot has provided routine indemnities with respect to such matters as environmental, tax, insurance, product and employee liabilities. In connection with various other agreements, including service and supply agreements with customers, Cabot has provided indemnities for certain contingencies and routine warranties. Cabot is unable to estimate the maximum potential liability for these types of indemnities as a maximum obligation is not explicitly stated in most cases and the amounts, if any, are dependent upon the outcome of future contingent events, the nature and likelihood of which cannot be reasonably estimated. The duration of the indemnities vary, and in many cases are indefinite. Cabot has not recorded any liability for these indemnities in the consolidated financial statements, except as otherwise disclosed. Self-Insurance and Retention for Certain Contingencies The Company is partially self-insured for certain third-party liabilities globally, as well as workers’ compensation and employee medical benefits in the United States. The third-party and workers’ compensation liabilities are managed through a wholly-owned insurance captive and the related liabilities are included in the consolidated financial statements. The employee medical obligations are managed by a third-party provider and the related liabilities are included in the consolidated financial statements. To limit Cabot’s potential liabilities for these risks, however, the Company purchases insurance from third-parties that provides stop-loss protection. The self-insured liability in fiscal 2022 for third-party liabilities was $500,000 per accident for auto, $2 million per occurrence for all other, $1 million per accident for U.S. workers’ compensation, and the retention for medical costs in the United States is at most $275,000 per person per annum. Contingencies Cabot is a defendant, or potentially responsible party, in various lawsuits and environmental proceedings wherein substantial amounts are claimed or at issue. Environmental Matters As of September 30, 2022 and 2021, Cabot had $ 4 3 assessment practices, remediation techniques and regulatory requirements, newly discovered conditions, and other factors, it is reasonably possible that the Company could incur additional costs in excess of environmental reserves currently recorded. Management estimates, based on the latest available information, that any such future environmental remediation costs that are reasonably possible to be in excess of amounts already recorded would be immaterial to the Company’s consolidated financial statements. Charges for environmental expense were $1 million in fiscal 2022, less than $ 1 2 The operation and maintenance component of the reserve for environmental matters was $ 3 In November 2013, Cabot entered into a Consent Decree with the EPA and the Louisiana Department of Environmental Quality (“LDEQ”) regarding Cabot’s three carbon black manufacturing facilities in the U.S. This settlement is related to EPA’s national enforcement initiative focused on the U.S. carbon black manufacturing sector alleging non-compliance with certain regulatory and permitting requirements under The Clean Air Act, including the New Source Review (“NSR”) construction permitting requirements. Pursuant to this settlement, Cabot has installed technology controls for the reduction of sulfur dioxide and nitrogen oxide emissions at two of its plants and is in the process of installing these controls at the third plant. Cabot is currently in discussions with the EPA and LDEQ to extend its compliance date at the third plant to mid 2024 based upon force majeure events primarily related to the COVID-19 pandemic. 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. Generally, these respirator liabilities involve claims for personal injury, including asbestosis, silicosis and coal worker’s pneumoconiosis (“CWP”), 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. The subsidiary transferred the business to Aearo Technologies (“Aearo”) in July 1995. Cabot agreed to have the subsidiary retain certain liabilities associated with exposure to asbestos and silica while using respirators prior to the 1995 transaction so long as Aearo paid, and continues to pay, Cabot an annual fee of $400,000. Aearo can discontinue payment of the fee at any time, in which case it will assume the responsibility for and indemnify Cabot against those liabilities which Cabot’s subsidiary had agreed to retain. The Company anticipates that it will continue to receive payment of the $400,000 fee from Aearo and thereby retain these liabilities for the foreseeable future. Cabot has no liability in connection with any products manufactured by Aearo after 1995. Because of the difficulty in determining when a particular respirator was manufactured, Aearo and Cabot have applied the retention of liabilities under the 1995 agreement to claims arising out of the alleged use of respirators involving exposure to asbestos, silica or silica products prior to January 1, 1997. On July 26, 2022, Aearo voluntarily filed for Chapter 11 bankruptcy protection with the stated goal of establishing a trust, funded by Aearo and its parent 3M, to satisfy respirator and other unrelated claims determined to be entitled to compensation. The Company will continue to monitor these proceedings for any impact on its liability for respirator claims. In addition to Cabot’s subsidiary and as described above, other parties are responsible for significant portions of the costs of respirator liabilities, leaving Cabot’s subsidiary with a portion of the liability in only some of the pending cases. These parties include Aearo, AO, AO’s insurers, another former owner and its insurers and a third-party manufacturer of respirators formerly sold under the AO brand and its insurers (collectively, with the Company’s subsidiary, the “Payor Group”). Cabot has contributed to the Payor Group’s defense and settlement costs with respect to a percentage of pending claims depending on several factors, including the period of alleged product use. In order to quantify Cabot’s estimated share of liability for pending and future respirator liability claims, Cabot has periodically engaged, through counsel, the assistance of Gnarus Advisors, LLC (“Gnarus”), a consulting firm in the field of tort liability valuation. The methodology used to estimate the liability addresses the complexities surrounding Cabot’s potential liability by making assumptions about Cabot’s likely exposure based on various factors, including the Payor Group’s historical experience with these claims, the number of future claims and the cost to resolve pending and future claims. Using those and other assumptions, the Company estimates the costs that would be incurred in defending and resolving both currently pending and future claims. In fiscal 2022, the Company recorded a charge of $6 million related to the respirator liability which was included in Selling and administrative expense in the Consolidated Statements of Operations. The charge was primarily due to an increase in the number of CWP claims filed in 2022. As of September 30, 2022 and 2021, the Company had $39 million and $44 million, respectively, reserved for its estimated share of liability for pending and future respirator claims, the majority of which the Company expects to incur over the next ten years. The reserve is included in Other liabilities and Accounts payable and accrued liabilities on the Consolidated Balance Sheets. The Company made payments related to its respirator liability of $11 million in fiscal 2022, and $37 million in both fiscal 2021 and fiscal 2020. The majority of the payments in fiscal 2020 and 2021 related to a February 2020 settlement agreement in which Cabot, with certain members of the Payor Group, resolved a large group of claims, including claims alleging serious injury, brought by coal workers in Kentucky and West Virginia represented by common legal counsel. 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 and developments in the Aearo bankruptcy proceedings, (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. Value-added Tax (“VAT”) Matter The Company has received assessments from a non-U.S. taxing authority for VAT related to certain sales made and services provided by certain of the Company’s subsidiaries from 2014 through 2019. The Company believes these transactions are exempt from VAT and has filed legal actions challenging the taxing authority’s application of VAT to them. Hearings on these matters are ongoing and it could potentially be a number of years before they are resolved. The Company believes its interpretation of these VAT rules is appropriate, and that it will be successful in its challenge against the taxing authority’s assessments. Accordingly, the Company does not believe it is probable that it will incur a loss related to these matters. However, the interpretation and application of these VAT rules is an unsettled issue, and the resolution of tax and regulatory matters is unpredictable. If it is determined in these proceedings that VAT applies to some or all of these various transactions, the Company could incur a charge that ranges between nil and $41 million for these matters, with the amount impacted by any interest and penalties associated with these matters and the amount, if any, of VAT the Company might subsequently recover from its customers. Brazil Indirect Tax Settlements The Company previously filed claims with the Brazilian tax authorities challenging the calculation of certain indirect taxes related to local social contributions for the years 2012 through 2019. During the third quarter of fiscal 2021, the Brazilian Federal Supreme Court rendered a final unappealable decision that clarified the methodology companies should use in the calculation. As a result of this decision, the Company is entitled to recover credits and associated interest related to the historical periods for overpayment of these indirect taxes to be used to offset future Brazilian tax liabilities. As such, the Company recorded a $12 million benefit during fiscal 2021 of which $9 million, related to the credit recovery was included in Net sales and other operating revenues and $3 million, related to interest income was included in Other income (expense) in the Consolidated Statement of Operations. 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.

Financial Information by Segmen

Financial Information by Segment & Geographic Area	12 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Financial Information by Segment & Geographic Area	Note T. Financial Information by Segment & Geographic Area Segment Information The Company identifies a business 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 Company has determined that all of its businesses are operating segments. 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 Company’s former Purification Solutions business was a separate reportable segment prior to divestiture in the second quarter of fiscal 2022. Income (loss) from continuing operations before income taxes (“Segment EBIT”) is presented for each reportable segment in the financial information by the reportable segment table below on the line entitled Income (loss) from continuing operations before taxes. Segment EBIT excludes 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, the full operating results of a contractual joint venture in Purification Solutions, royalties, Net income (loss) attributable to noncontrolling interests, net of tax, and discounting charges for certain Notes receivable, but excludes Interest expense, foreign currency transaction gains and losses, interest income, dividend income, unearned revenue, general unallocated expense and unallocated corporate costs. Segment assets exclude cash, short-term investments, cost investments, income taxes receivable, deferred taxes and headquarters’ assets, which are included in unallocated and other. Expenditures for additions to long-lived assets include total equity and other investments (including available-for-sale securities) and property, plant and equipment. Reinforcement Materials Carbon black is a form of elemental carbon that is manufactured in a highly controlled process to produce particles and aggregates of varied size, structure and surface chemistry, resulting in many different performance characteristics for a wide variety of applications. Reinforcing carbons (a class of carbon blacks manufactured by Cabot) are used to enhance the physical properties of the systems and applications in which they are incorporated. The Company’s reinforcing carbons products are used in tires and industrial products. Reinforcing carbons have traditionally been used in the tire industry as a rubber reinforcing agent to increase tread durability and are also used as a performance additive to reduce rolling resistance and improve traction. In industrial products such as hoses, belts, extruded profiles and molded goods, reinforcing carbons are used to improve the physical performance of the product, including the product’s physical strength, fluid resistance, conductivity and resistivity. In addition to its reinforcing carbons products, the Company manufactures engineered elastomer composites (“E2C™”) solutions that are composites of reinforcing carbons and rubber made using the Company’s patented elastomer composites manufacturing process. These composites improve abrasion/wear resistance, reduce fatigue of rubber parts and reduce rolling resistance compared to reinforcing carbons/rubber compounds made entirely by conventional rubber mix methods enabling rubber product manufacturers to reduce the need to make performance trade-offs. Performance Chemicals Performance Chemicals is organized into two businesses: the Company’s Performance Additives business and its Formulated Solutions business. The Company’s Performance Additives business combines its specialty carbons, battery materials, fumed metal oxides and aerogel product lines, and its Formulated Solutions business combines its specialty compounds and inkjet product lines. In Performance Chemicals, the Company designs, manufactures and sells materials that deliver performance in a broad range of customer applications across the automotive, construction, infrastructure, inkjet printing, electronics, and consumer products sectors, and applications related to generation, transmission and storage of energy. The Company’s focus areas for growth include conductive carbon additives and other materials for battery applications, and inkjet dispersions for post print corrugated packaging applications . The net sales from each of these businesses for fiscal 2022, 2021 and 2020 are as follows: Years Ended September 30 2022 2021 2020 (In millions) Performance Additives $ 1,013 $ 796 $ 645 Formulated Solutions 359 352 288 Total Performance Chemicals $ 1,372 $ 1,148 $ 933 Performance Additives Business The Company’s specialty carbons are used to impart color, provide rheology control, enhance conductivity and static charge control, provide UV protection, enhance mechanical properties, and provide formulation flexibility through surface treatment. These specialty carbon products are used in a wide variety of applications, such as inks, coatings, cables, plastics, adhesives, toners, batteries and displays. The Company’s battery materials products include its conductive carbon additives and fumed alumina, which are used principally in advanced lead acid and lithium-ion batteries used in electric vehicles. The Company’s conductive carbon additives consist of conductive carbons, carbon nanotubes and carbon nano-structures, and blends of these materials, each of which offers different levels of conductivity and formulation flexibility for battery manufacturers to address performance (energy density, fast charging), cost and safety. In lithium-ion batteries, the Company’s conductive carbon additives are used in both cathode and anode applications to increase energy density by providing a conductive network between active materials. Fumed alumina is used to reduce cathode material and electrolyte decomposition and improve capacity retention leading to longer cycle life. Fumed silica is an ultra-fine, high-purity particle used as a reinforcing, thickening, abrasive, thixotropic, suspending or anti-caking agent in a wide variety of products for the automotive, construction, microelectronics, batteries, and consumer products industries. These products include adhesives, sealants, cosmetics, batteries, inks, toners, silicone elastomers, coatings, polishing slurries and pharmaceuticals. In addition to its battery application, fumed alumina, also an ultra-fine, high-purity particle, is used as an abrasive, absorbent or barrier agent in a variety of products, such as inkjet media, lighting, coatings, cosmetics and polishing slurries. Aerogel is a hydrophobic, silica-based particle with a high surface area that is used in a variety of thermal insulation and specialty chemical applications. In the building and construction industry, the product is used in insulative sprayable plasters and composite building products, as well as translucent skylight, window, wall and roof systems for insulating eco-daylighting applications. In the specialty chemicals industry, the product is used to provide matte finishing, insulating and thickening properties for use in a variety of applications, including thermal management for lithium-ion batteries. Formulated Solutions Business Cabot’s masterbatch and conductive compound products, which Cabot refers to as “specialty compounds”, are formulations derived from specialty carbons mixed with polymers and other additives. These products are generally used by plastic resin producers and converters in applications for the automotive, industrial, packaging, infrastructure, agricultural, consumer products, and electronics industries. As an alternative to directly mixing specialty carbon blacks, these formulations offer greater ease of handling and help customers achieve their desired levels of dispersion and color and manage the addition of small doses of additives. In addition, Cabot’s electrically conductive compound products generally are used to help ensure uniform conductive performance and reduce risks associated with electrostatic discharge in plastics applications. The Company’s inkjet colorants are high-quality pigment-based black and color dispersions and inks. The Company’s dispersions are based on patented pigment surface modification technology and polymer encapsulation technology. The dispersions are used in aqueous inkjet inks to impart color, sharp print characteristics and durability, while maintaining high printhead reliability. These products are used in various inkjet printing applications, including traditional work-from-home and corporate office settings, and, increasingly, in commercial and corrugated packaging printing, that all require a high level of dispersibility and colloidal stability. Our inkjet inks, which utilize our pigment-based colorant dispersions, are used in the commercial printing segment for digital print. Purification Solutions Cabot divested its Purification Solutions business on March 1, 2022. Refer to Note D for the terms of this transaction. Financial information by reportable segment is as follows: Years Ended September 30 Reinforcement Materials Performance Chemicals Purification Solutions Segment Total (1) Unallocated and Other (2), (4) Consolidated Total (In millions) 2022 Revenues from external customers (3) $ 2,575 $ 1,372 $ 97 $ 4,044 $ 277 $ 4,321 Depreciation and amortization $ 70 $ 72 $ 3 $ 145 $ 1 $ 146 Equity in earnings of affiliated companies $ 4 $ 5 $ 1 $ 10 $ — $ 10 Income (loss) from continuing operations before income taxes (4) $ 408 $ 234 $ — $ 642 $ (307 ) $ 335 Assets (5) $ 1,691 $ 1,458 $ — $ 3,149 $ 376 $ 3,525 Total expenditures for additions to long-lived assets (6) $ 114 $ 100 $ 3 $ 217 $ 4 $ 221 2021 Revenues from external customers (3) $ 1,781 $ 1,148 $ 257 $ 3,186 $ 223 $ 3,409 Depreciation and amortization $ 70 $ 73 $ 16 $ 159 $ 1 $ 160 Equity in earnings of affiliated companies $ — $ 2 $ 2 $ 4 $ (1 ) $ 3 Income (loss) from continuing operations before income taxes (4) $ 329 $ 211 $ 10 $ 550 $ (144 ) $ 406 Assets (5) $ 1,421 $ 1,325 $ 283 $ 3,029 $ 277 $ 3,306 Total expenditures for additions to long-lived assets (6) $ 104 $ 80 $ 9 $ 193 $ 5 $ 198 2020 Revenues from external customers (3) $ 1,256 $ 933 $ 253 $ 2,442 $ 172 $ 2,614 Depreciation and amortization $ 68 $ 64 $ 24 $ 156 $ 2 $ 158 Equity in earnings of affiliated companies $ — $ 1 $ 3 $ 4 $ (1 ) $ 3 Income (loss) from continuing operations before income taxes (4) $ 162 $ 118 $ 3 $ 283 $ (316 ) $ (33 ) Assets (5) $ 1,077 $ 1,145 $ 296 $ 2,518 $ 263 $ 2,781 Total expenditures for additions to long-lived assets (6) $ 66 $ 92 $ 8 $ 166 $ 3 $ 169 (1) Cabot divested its (2) 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. ( 3 ) 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 royalties, external shipping and handling fees, the impact of unearned revenue, discounting charges for certain Notes receivable, by-product revenue, and indirect tax settlement credits. Details are provided in the table below. Years Ended September 30 2022 2021 2020 (In millions) Shipping and handling fees $ 162 $ 153 $ 113 By-product sales 122 73 62 Other (7 ) (3 ) (3 ) Total $ 277 $ 223 $ 172 ( 4 ) Consolidated Total Income (loss) from continuing operations before income taxes reconciles to Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies on the Consolidated Statements of Operations. Total Income (loss) from continuing operations before income taxes that are categorized as Unallocated and Other includes: Years Ended September 30 2022 2021 2020 (In millions) Interest expense $ (56 ) $ (49 ) $ (53 ) Certain items: (a) Gain on bargain purchase of a business (Note C) $ 24 $ — $ — Gain on sale of land 17 — — Specialty Fluids divestiture related benefit 5 — — Employee benefit plan settlement and other charges (Note M) 1 (4 ) (10 ) Loss on sale of business and asset impairment charge (207 ) — — Legal and environmental matters and reserves (Note S) (9 ) (25 ) (54 ) Purification Solutions divestiture related charges (5 ) — — Acquisition and integration-related charges (6 ) (5 ) (5 ) Global restructuring activities (3 ) (11 ) (19 ) Marshall Mine loss on sale and asset impairment charge (Note D) — — (129 ) Inventory reserve adjustment — — (2 ) Specialty Fluids loss on sale and asset impairment charge — — (1 ) Indirect tax settlement credits — 12 3 Other certain items — (1 ) (1 ) Total certain items, pre-tax (183 ) (34 ) (218 ) Unallocated corporate costs (b) (59 ) (58 ) (41 ) General unallocated income (expense) (c) 1 — (1 ) Less: Equity in earnings of affiliated companies, net of tax (d) 10 3 3 Total $ (307 ) $ (144 ) $ (316 ) (a) Certain items are items that management does not consider representative of operating segment results and they are, therefore, excluded from Segment EBIT. (b) Unallocated corporate costs 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 income, dividend income, the profit or loss related to the corporate adjustment for unearned revenue, and the impact of including the full operating results of a contractual joint venture in Purification Solutions Segment EBIT. (d) Equity in earnings of affiliated companies, net of tax is included in Segment EBIT and is removed from Unallocated and other to reconcile to income (loss) from operations before taxes. ( 5 ) Unallocated and Other assets includes cash, marketable securities, cost investments, income taxes receivable, deferred taxes, headquarters’ assets, and current and non-current assets held for sale. ( 6 ) Expenditures for additions to long-lived assets include total equity and other investments (including available-for-sale securities) and property, plant and equipment. Geographic Information Revenues from external customers attributable to an individual country, other than the U.S. and China, were not material for disclosure. Revenues from external customers by individual country are summarized as follows: Years Ended September 30 2022 2021 2020 (In millions) United States $ 842 $ 668 $ 581 China 1,129 858 598 Other countries 2,350 1,883 1,435 Total $ 4,321 $ 3,409 $ 2,614 Each of the Company’s segments operates globally. In addition to presenting Revenue from external customers by reportable segment, the following tables further disaggregate Revenue from external customers by geographic region. Year Ended September 30, 2022 Reinforcement Materials Performance Chemicals Purification Solutions Consolidated Total (In millions) Americas $ 1,057 $ 417 $ 43 $ 1,517 Asia Pacific 1,009 563 14 1,586 Europe, Middle East and Africa 509 392 40 941 Segment revenues from external customers 2,575 1,372 97 4,044 Unallocated and other 277 Net sales and other operating revenues $ 4,321 Year Ended September 30, 2021 Reinforcement Materials Performance Chemicals Purification Solutions Consolidated Total (In millions) Americas $ 699 $ 310 $ 110 $ 1,119 Asia Pacific 745 485 34 1,264 Europe, Middle East and Africa 337 353 113 803 Segment revenues from external customers 1,781 1,148 257 3,186 Unallocated and other 223 Net sales and other operating revenues $ 3,409 Year Ended September 30, 2020 Reinforcement Materials Performance Chemicals Purification Solutions Consolidated Total (In millions) Americas $ 490 $ 266 $ 112 $ 868 Asia Pacific 529 368 34 931 Europe, Middle East and Africa 237 299 107 643 Segment revenues from external customers 1,256 933 253 2,442 Unallocated and other 172 Net sales and other operating revenues $ 2,614 Property, plant and equipment attributable to an individual country, other than the U.S. and China, were not material for disclosure. Property, plant and equipment information by individual country is summarized as follows: Years Ended September 30 2022 2021 (In millions) United States $ 524 $ 513 China 333 333 Other countries 413 530 Total $ 1,270 $ 1,376

Significant Accounting Polici_2

Significant Accounting Policies (Policies)	12 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The consolidated financial statements include the accounts of Cabot and its wholly-owned subsidiaries and majority-owned and controlled subsidiaries. Additionally, Cabot considers consolidation of entities over which control is achieved through means other than voting rights, of which there were none in the periods presented. Intercompany transactions have been eliminated in consolidation.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash equivalents include all highly liquid investments with a maturity of three months or less at date of acquisition. Cabot continually assesses the liquidity of cash equivalents and, as of September 30, 2022, has determined that they are readily convertible to cash.
Inventories	Inventories Inventories are stated at the lower of cost or net realizable value. The cost of inventories is determined using the first-in, first-out method. Cabot periodically reviews inventory for both potential obsolescence and potential declines in anticipated selling prices. In this review, the Company makes assumptions about the future demand for and market value of the inventory, and based on these assumptions estimates the amount of any obsolete, unmarketable, slow moving, or overvalued inventory. Cabot writes down the value of these inventories by an amount equal to the difference between the cost of the inventory and its estimated net realizable value.
Investments	Investments The Company has investments in equity affiliates and marketable securities. As circumstances warrant, all investments are subject to periodic impairment reviews. Unless consolidation is required, investments in equity affiliates, where Cabot generally owns between 20% and 50% of the affiliate, are accounted for using the equity method. Cabot records its share of the equity affiliate’s results of operations based on its percentage of ownership of the affiliate. Dividends declared from equity affiliates are a return on investment and are recorded as a reduction to the equity investment value. At September 30, 2022 and 2021, Cabot had equity affiliate investments of an
Intangible Assets and Goodwill Impairment	Intangible Assets and Goodwill Impairment The Company records tangible and intangible assets acquired and liabilities assumed in business combinations under the acquisition method of accounting. Amounts paid for an acquisition are allocated to the assets acquired and liabilities assumed based on their fair values at the date of acquisition. The Company uses assumptions and estimates in determining the fair value of assets acquired and liabilities assumed in a business combination. The determination of the fair value of intangible assets requires the use of significant judgment with regard to assumptions used in the valuation model. The Company estimates the fair value of identifiable acquisition-related intangible assets principally based on projections of cash flows that will arise from these assets. The projected cash flows are discounted to determine the fair value of the assets at the dates of acquisition. Definite-lived intangible assets, which are comprised of trademarks, customer relationships and developed technologies, are amortized over their estimated useful lives and are reviewed for impairment when indication of potential impairment exists, such as a significant reduction in cash flows associated with the assets. Goodwill is comprised of the purchase price of business acquisitions in excess of the fair value assigned to the net tangible and identifiable intangible assets acquired. Goodwill is not amortized and is subject to impairment testing annually, or when events or changes in the business environment indicate that the carrying value of the reporting unit may exceed its fair value. A reporting unit, for the purpose of the impairment test, is at or below the operating segment level, and constitutes a business for which discrete financial information is available and regularly reviewed by segment management. Reinforcement Materials, and the fumed metal oxides, specialty compounds, and battery materials product lines within Performance Chemicals, which are considered separate reporting units, carry the Company’s goodwill balances as of September 30, 2022. For the purpose of the goodwill impairment test, the Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If an initial qualitative assessment identifies that it is more likely than not that the carrying value of a reporting unit exceeds its estimated fair value, an additional quantitative evaluation is performed. Alternatively, the Company may elect to proceed directly to the quantitative goodwill impairment test. If based on the quantitative evaluation the fair value of the reporting unit is less than its carrying amount, a goodwill impairment loss would result. The goodwill impairment loss would be the amount by which the carrying value of the reporting unit, including goodwill, exceeds its fair value, limited to the total amount of goodwill allocated to that reporting unit. The fair value of a reporting unit is based on discounted estimated future cash flows. The assumptions used to estimate fair value include management’s best estimates of future growth rates, operating cash flows, capital expenditures and discount rates over an estimate of the remaining operating period at the reporting unit level. The fair value is also benchmarked against the value calculated from a market approach using the guideline public company method. Based on the Company’s most recent annual goodwill impairment test performed as of August 31, 20 2 2 , the fair values of the R einforcement Materials, f umed m etal o xides , s pecialty c ompounds , and battery materials reporting units were substantially in excess of their carrying values.
Long-Lived Assets Impairment	Long-lived Assets Impairment The Company’s long-lived assets primarily include property, plant and equipment, and intangible assets. The carrying values of long-lived assets are reviewed for impairment whenever events or changes in business circumstances indicate that the carrying amount of an asset may not be recoverable. To test for impairment of assets, the Company generally uses a probability-weighted estimate of the future undiscounted net cash flows of the assets over their remaining lives to determine if the value of the asset is recoverable. Long-lived assets are grouped with other assets and liabilities at the lowest level for which independent identifiable cash flows are determinable. An asset impairment is recognized when the carrying value of the asset is not recoverable based on the analysis described above, in which case the asset is written down to its fair value. If the asset does not have a readily determinable market value, a discounted cash flow model may be used to determine the fair value of the asset. In circumstances when an asset does not have separate identifiable cash flows, an impairment charge is recorded when the Company no longer intends to use the asset.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment are recorded at cost. Depreciation of property, plant and equipment is calculated using the straight-line method over the estimated useful lives of the related assets. The depreciable lives for buildings, machinery and equipment, and other fixed assets are generally between twenty and twenty-five years, ten and twenty-five years, and three and twenty-five years, respectively. The cost and accumulated depreciation for property, plant and equipment sold, retired, or otherwise disposed of are removed from the Consolidated Balance Sheets and resulting gains or losses are included in earnings in the Consolidated Statements of Operations. Expenditures for repairs and maintenance are charged to expenses as incurred. Expenditures for major renewals and betterments, which significantly extend the useful lives of existing plant and equipment, are capitalized and depreciated. Cabot capitalizes interest costs when they are part of the cost of acquiring and constructing certain assets that require a period of time to prepare for their intended use. During fiscal 2022, 2021 and 2020, Cabot capitalized $3 million, $1 million and $2 million of interest costs, respectively. These amounts are amortized over the lives of the related assets when they are placed in service.
Asset Retirement Obligations	Asset Retirement Obligations Cabot estimates incremental costs for special handling, removal and disposal of materials that may or will give rise to conditional asset retirement obligations (“ARO”) and then discounts the expected costs back to the current year using a credit adjusted risk free rate. Cabot recognizes ARO liabilities and costs when the timing and/or settlement can be reasonably estimated. In certain instances, Cabot has not recorded a reserve for AROs because the timing of disposal of the underlying asset is unknown. The ARO reserves were $10 million and $19 million at September 30, 2022 and 2021, respectively. The decrease was primarily driven by the sale of the Purification Solutions business.
Foreign Currency Translation	Foreign Currency Translation The functional currency of the majority of Cabot’s foreign subsidiaries is the local currency in which the subsidiary operates. Assets and liabilities of foreign subsidiaries are translated into U.S. dollars at exchange rates in effect at the balance sheet dates. Income and expense items are translated at average monthly exchange rates during the year. The functional currency of Cabot’s foreign subsidiaries that operate in a highly inflationary economy is the U.S. dollar. Cabot’s operations in highly inflationary economies are not material. Unrealized currency translation adjustments (“CTA”) are included as a separate component of Accumulated other comprehensive income (loss) (“AOCI”) within stockholders’ equity. Realized and unrealized foreign currency gains and losses arising from transactions denominated in currencies other than the subsidiary’s functional currency are reflected in earnings with the exception of (i) intercompany transactions considered to be of a long-term investment nature; (ii) income taxes upon future repatriation of unremitted earnings from non-U.S. subsidiaries that are not indefinitely reinvested; and (iii) foreign currency borrowings designated as net investment hedges. Gains or losses arising from these transactions are included within the CTA component of Other comprehensive income (loss). In fiscal 2022, 2021 and 2020, net foreign currency transaction loss of $13 million, $6 million, and $6 million, respectively, is included in Other income (expense) in the Consolidated Statements of Operations.
Share Repurchases	Share Repurchases Periodically, Cabot repurchases shares of the Company’s common stock in the open market or in privately negotiated transactions under the authorization approved by the Board of Directors. The Company retires the repurchased shares and records the excess of the purchase price over par value to additional paid-in capital (“APIC”) until such amount is reduced to zero and then charges the remainder against retained earnings.
Financial Instruments	Financial Instruments Cabot’s financial instruments consist primarily of cash and cash equivalents, accounts and notes receivable, investments, accounts payable and accrued liabilities, short-term and long-term debt, and derivative instruments. The carrying values of Cabot’s financial instruments approximate fair value with the exception of fixed rate long-term debt, which is recorded at amortized cost. The fair values of the Company’s financial instruments are based on quoted market prices, if such prices are available. In situations where quoted market prices are not available, the Company relies on valuation models to derive fair value. Such valuations take into account the ability of the financial counterparty to perform and the Company’s own credit risk. Cabot uses derivative financial instruments primarily for purposes of hedging the exposures to fluctuations in foreign currency exchange rates, which exist as part of its on-going business operations. Cabot does not enter into derivative contracts for speculative purposes, nor does it hold or issue any derivative contracts for trading purposes. All derivatives are recognized on the Consolidated Balance Sheets at fair value. Where Cabot has a legal right to offset derivative settlements under a master netting agreement with a counterparty, derivatives with that counterparty are presented on a net basis. The changes in the fair value of derivatives are recorded in either earnings or AOCI, depending on whether or not the instrument is designated as part of a hedge transaction and, if designated as part of a hedge transaction, the type of hedge transaction. The gains or losses on derivative instruments reported in AOCI are reclassified to earnings in the period in which earnings are affected by the underlying hedged item. The ineffective portion of all hedges is recognized in earnings during the period in which the ineffectiveness occurs. In accordance with Cabot’s risk management strategy, the Company may enter into certain derivative instruments that may not be designated as hedges for hedge accounting purposes. Although these derivatives are not designated as hedges, the Company believes that such instruments are closely correlated with the underlying exposure, thus managing the associated risk. The Company records in earnings the gains or losses from changes in the fair value of derivative instruments that are not designated as hedges. Cash movements associated with these instruments are presented in the Consolidated Statements of Cash Flows as Cash Flows from Operating Activities because the derivatives are designed to mitigate risk to the Company’s cash flow from operations.
Revenue Recognition	Revenue Recognition Cabot recognizes revenue when its customers obtain control of promised goods or services. The revenue recognized is the amount of consideration which the Company expects to receive in exchange for those goods or services. The Company’s contracts with customers are generally for products only and do not include other performance obligations. Generally, Cabot considers purchase orders, which in some cases are governed by master supply agreements, to be contracts with customers. The transaction price as specified on the purchase order or sales contract is considered the standalone selling price for each distinct product. To determine the transaction price at the time when revenue is recognized, the Company evaluates whether the price is subject to adjustments, such as for returns, discounts or volume rebates, which are stated in the customer contract, to determine the net consideration to which the Company expects to be entitled. Revenue from product sales is recognized based on a point in time model when control of the product is transferred to the customer, which typically occurs upon shipment or delivery of the product to the customer and title, risk and rewards of ownership have passed to the customer. The Company has an immaterial amount of revenue that is recognized over time. Payment terms typically range from zero to ninety days Shipping and handling activities that occur after the transfer of control to the customer are billed to customers and are recorded as sales revenue, as the Company considers these to be fulfillment costs. Shipping and handling costs are expensed in the period incurred and included in Cost of sales within the Consolidated Statement of Operations. Taxes collected on sales to customers are excluded from the transaction price. The Company generally provides a warranty that its products will substantially conform to the identified specifications. The Company’s liability typically is limited to either a credit equal to the purchase price or replacement of the non-conforming product. Returns under warranty have historically been immaterial. The Company does not have contract assets or liabilities that are material. When the period of time between the transfer of control of the goods and the time the customer pays for the goods is one year or less, the Company does not consider there to be a significant financing component associated with the contract.
Cost of Sales	Cost of Sales Cost of sales consists of the cost of raw and packaging materials, direct manufacturing costs, depreciation, internal transfer costs, inspection costs, inbound and outbound freight and shipping and handling costs, plant purchasing and receiving costs and other overhead expenses necessary to manufacture the products.
Accounts and Notes Receivable	Accounts and Notes Receivable Trade receivables are recorded at the invoiced amount and generally do not bear interest. Trade receivables in China may at certain times be settled with the receipt of bank issued non-interest bearing notes. These notes totaled $8 million and $5 million as of September 30, 2022 and 2021, respectively, and are included in Accounts and notes receivable on the Company’s Consolidated Balance Sheets. Cabot periodically sells a portion of these bank notes and other customer receivables at a discount and such sales are accounted for as asset sales. The Company does not have any continuing involvement with these notes or other customer receivables after the sale. The difference between the proceeds from the sale and the carrying value of these assets is recognized as a loss on the sale of receivables and is included in Other income (expense) in the accompanying Consolidated Statements of Operations. During fiscal year 2022, 2021, and 2020, the Company recorded charges of $3 million, $2 million, and $2 million, respectively, for the sale of these assets. Cabot maintains allowances for doubtful accounts based on an assessment of the collectability of specific customer accounts, the aging of accounts receivable and other economic information on both a historical and prospective basis. Customer account balances are charged against the allowance when it is probable the receivable will not be recovered. There were no material changes in the allowance for any of the years presented. There is no material off-balance sheet credit exposure related to customer receivable balances.
Stock-Based Compensation	Stock-based Compensation Cabot recognizes compensation expense for stock-based awards granted to employees using the fair value method. Under the fair value recognition provisions, stock-based compensation cost is measured at the grant date based on the fair value of the award, and is recognized as expense over the service period, which generally represents the vesting period, and includes an estimate of what level of performance the Company will achieve for Cabot’s performance-based stock awards. Cabot calculates the fair value of its stock options using the Black-Scholes option pricing model. The fair value of restricted stock units is determined using the closing price of Cabot stock on the day of the grant. The Company recognizes forfeitures as they occur.
Selling and Administrative Expenses	Selling and Administrative Expenses Selling and administrative expenses consist of salaries and fringe benefits of sales and office personnel, general office expenses and other expenses not directly related to manufacturing operations.
Research and Technical Expenses	Research and Technical Expenses Research and technical expenses include salaries, equipment and material expenditures, and contractor fees and are expensed as incurred.
Pensions and Other Postretirement Benefits	Pensions and Other Postretirement Benefits The Company recognizes the funded status of defined benefit pension and other postretirement benefit plans as an asset or liability. This amount is defined as the difference between the fair value of plan assets and the benefit obligation. Pension and post-retirement benefit costs other than service cost are included in Other income (expense) in the Consolidated Statement of Operations. Service cost is included with other employee compensation costs within Cost of sales, Selling and administrative expenses, or Research and technical expenses. The Company is required to recognize as a component of Other comprehensive income (loss), net of tax, the actuarial gains and losses and prior service costs and credits that arise but were not previously required to be recognized as components of net periodic benefit cost. Other comprehensive income (loss) is adjusted as these amounts are later recognized in income as components of net periodic benefit cost.
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) AOCI, which is included as a component of stockholders’ equity, includes unrealized gains or losses on derivative instruments, currency translation adjustments in foreign subsidiaries and pension and post-retirement related adjustments.
Income Taxes	Income Taxes Deferred income taxes are determined based on the estimated future tax effects of differences between financial statement carrying amounts and the tax bases of existing assets and liabilities. Deferred tax assets are recognized to the extent that realization of those assets is considered to be more likely than not. A valuation allowance is established for deferred taxes when it is more likely than not that all or a portion of the deferred tax assets will not be realized. Provisions are made for the U.S. income tax liability and additional non-U.S. taxes on the undistributed earnings of non-U.S. subsidiaries, except for amounts Cabot has designated to be indefinitely reinvested. Cabot records benefits for uncertain tax positions based on an assessment of whether the position is more likely than not to be sustained by the taxing authorities. If this threshold is not met, no tax benefit of the uncertain tax position is recognized. If the threshold is met, the tax benefit that is recognized is the largest amount that is greater than 50% likely of being realized upon ultimate settlement. This analysis presumes the taxing authorities’ full knowledge of the positions taken and all relevant facts, but does not consider the time value of money. The Company also accrues for interest and penalties on its uncertain tax positions and includes such charges in its income tax provision in the Consolidated Statements of Operations.
Contingencies	Contingencies Cabot accrues costs related to contingencies when it is probable that a liability has been incurred and the amount can be reasonably estimated. Contingencies could arise from litigation, environmental remediation or contractual arrangements. When a single liability amount cannot be reasonably estimated, but a range can be reasonably estimated, Cabot accrues the amount that reflects the best estimate within that range or the low end of the range if no estimate within the range would be considered more likely than any other estimate. The amount accrued is determined through the evaluation of various information, which could include claims, settlement offers, demands by government agencies, estimates performed by independent third parties, identification of other responsible parties and an assessment of their ability to contribute, and our prior experience. Cabot does not reduce its estimated liability for possible recoveries from insurance carriers. Proceeds from insurance carriers are recorded when realized by either the receipt of cash or a contractual agreement.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make certain estimates and assumptions that affect the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reported period. Actual results could differ from those estimates.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards In December 2019, the FASB issued a new standard Simplifying the Accounting for Income Taxes. The new guidance simplifies the accounting for income taxes by removing several exceptions in the current standard and adding guidance to reduce complexity in certain areas. The new standard is effective for fiscal years beginning after December 15, 2020 and early adoption is permitted. The adoption of this standard did not materially impact the Company’s Consolidated Financial Statements.
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In March 2020, the FASB issued a new standard on Reference Rate Reform, which provides temporary optional expedients and exceptions to the existing guidance on contract modifications and hedge accounting to ease the financial reporting burdens related to the expected market transition from the London Interbank Offered Rate (“LIBOR”) and other interbank offered rates to alternative reference rates. The standard was effective upon issuance and may generally be applied through December 31, 2022 to any new or amended contracts, hedging relationships, and other transactions that reference LIBOR. As outlined in Note I, Debt and Other Obligations , the Company amended and restated credit agreements to align with the customary LIBOR replacement language. As such, the application of the expedients did not have an impact on the Consolidated Financial Statements. In August 2022, the U.S. government enacted the Inflation Reduction Act which, among other things, provides for a 1% excise tax on stock repurchases. The Company is currently evaluating the provisions of the act but does not anticipate these provisions will have a material effect on its Consolidated Financial Statements, or its share repurchase program. In November 2022, the FASB issued a new standard on the disclosure of supplier financing programs. The new standard requires qualitative and quantitative disclosure as to the nature and potential magnitude of such programs in addition to program activity and changes for the periods presented. The standard is effective for fiscal years beginning after December 15, 2022 and early adoption is permitted. The Company is currently evaluating the timing of adoption and the impact of the adoption of this standard on its Consolidated Financial Statements.

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Sep. 30, 2022
Tokai Carbon Group Tianjin Co
Business Acquisition [Line Items]
Schedule of Final Allocation of Purchase Price Based on Estimates of Fair Value of Assets and Liabilities Acquired	The final allocation of the purchase price and calculation of the Gain on bargain purchase of a business set forth below was based on estimates of the fair value of assets and liabilities acquired as of February 28, 2022. (In millions) Fair value of asset acquired Cash $ 5 Accounts and notes receivable 5 Inventories 11 Prepaid expenses and other current assets 7 Property, plant and equipment 12 Amounts attributable to assets acquired 40 Fair value of liabilities assumed Accounts payable and accrued liabilities (2 ) Amounts attributable to liabilities assumed (2 ) Total identifiable net assets 38 Cash Consideration 14 Gain on bargain purchase of a business $ 24

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Sep. 30, 2022
Inventory Disclosure [Abstract]
Components of Company's Inventories	Inventories, net of obsolete, unmarketable and slow moving reserves, are as follows: September 30 2022 2021 (In millions) Raw materials $ 182 $ 168 Finished goods 427 300 Other (1) 55 55 Total $ 664 $ 523 (1) Other inventory is comprised of certain spare parts and supplies.

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Sep. 30, 2022
Property Plant And Equipment [Abstract]
Components of Property, Plant and Equipment	Property, plant and equipment consists of the following: September 30 2022 2021 (In millions) Land and land improvements $ 75 $ 114 Buildings 553 575 Machinery and equipment 2,473 2,765 Other 229 241 Construction in progress 224 190 Total property, plant and equipment 3,554 3,885 Less: Accumulated depreciation (2,284 ) (2,509 ) Net property, plant and equipment $ 1,270 $ 1,376

Goodwill and Intangible Assets

Goodwill and Intangible Assets (Tables)	12 Months Ended
	Sep. 30, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Goodwill Balances	The carrying amount of goodwill attributable to each reportable segment with goodwill balances and the changes in those balances during the fiscal year ended September 30, 2022 are as follows Reinforcement Materials Performance Chemicals Total (In millions) Balance at September 30, 2021 (1) $ 48 $ 92 $ 140 Foreign currency impact (2 ) (9 ) (11 ) Balance at September 30, 2022 $ 46 $ 83 $ 129 (1) The balance as of September 30, 2021 included $444 million of accumulated impairment losses associated with the goodwill of Purification Solutions segment.
Schedule of Intangible Assets with Finite Lives	The following table provides information regarding the Company’s intangible assets with finite lives: September 30, 2022 September 30, 2021 Gross Carrying Value Accumulated Amortization Net Intangible Assets Gross Carrying Value Accumulated Amortization Net Intangible Assets (In millions) Developed technologies $ 34 $ (8 ) $ 26 $ 62 $ (12 ) $ 50 Trademarks 2 (1 ) 1 11 (1 ) 10 Customer relationships 59 (23 ) 36 60 (20 ) 40 Total intangible assets $ 95 $ (32 ) $ 63 $ 133 $ (33 ) $ 100

Accounts Payable, Accrued Lia_2

Accounts Payable, Accrued Liabilities and Other Liabilities (Tables)	12 Months Ended
	Sep. 30, 2022
Payables And Accruals [Abstract]
Components of Accounts Payable and Accrued Liabilities	Accounts payable and accrued liabilities included in current liabilities consist of the following: September 30 2022 2021 (In millions) Accounts payable $ 533 $ 480 Accrued employee compensation 66 75 Other accrued liabilities 108 112 Total $ 707 $ 667
Components of Other Long-Term Liabilities	Other long-term liabilities consist of the following: September 30 2022 2021 (In millions) Employee benefit plan liabilities $ 51 $ 80 Operating lease liabilities 83 84 Other accrued liabilities 100 115 Total $ 234 $ 279

Debt and Other Obligations (Tab

Debt and Other Obligations (Tables)	12 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Schedule of Long-Term Obligations	The Company’s long-term obligations, the fiscal year in which they mature and their respective interest rates are summarized below: September 30 2022 2021 (In millions) Variable Rate Debt: Revolving Credit Facility, expires fiscal 2026 $ — $ — Revolving Credit Facility - Euro, expires fiscal 2024 114 134 Total variable rate debt 114 134 Fixed Rate Debt: 3.7% Notes due fiscal 2022 — 350 3.4% Notes due fiscal 2026 250 250 4.0% Notes due fiscal 2029 300 300 5.0% Notes due fiscal 2032 400 — Medium Term Notes: Notes due fiscal 2022, 8.34% — 8.47% — 15 Notes due fiscal 2028, 6.57% — 7.28% 8 8 Total Medium Term Notes 8 23 Chinese Renminbi Debt, due fiscal 2023, 4.35% 4 4 Total fixed rate debt 962 927 Finance lease obligations (Note R) 29 33 Unamortized debt issuance costs and debt discount (9 ) (4 ) Total debt 1,096 1,090 Less current portion of long-term debt (7 ) (373 ) Total long-term debt $ 1,089 $ 717
Schedule of Future Years Payment	The aggregate principal amounts of long-term debt, excluding finance lease liabilities presented separately in Note R, due in each of the five years from fiscal 2023 through 2027 and thereafter are as follows: Years Ending September 30 Principal Payments on Long-Term Debt (In millions) 2023 $ 4 2024 114 2025 — 2026 250 2027 — Thereafter 708 Total $ 1,076

Derivatives (Tables)

Derivatives (Tables)	12 Months Ended
	Sep. 30, 2022
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Details of Derivatives Held to Manage Foreign Currency Risk	The following table provides details of the derivatives held as of September 30, 2022 and 2021 to manage foreign currency risk. Notional Amount Description Borrowing September 30, 2022 September 30, 2021 Hedge Designation Cross Currency Swaps 3.4% Notes USD 250 million swapped to EUR 223 million USD 250 million swapped to EUR 223 million Net investment Forward Foreign Currency Contracts (1) N/A USD 42 million USD 48 million No designation (1) At both September 30, 2022 and 2021, Cabot’s forward foreign exchange contracts were denominated in Indonesian rupiah and Czech koruna.
Summary Impact of Cross-currency Swaps to AOCI and Consolidated Statements of Operations	The following table summarizes the impact of the cross-currency swaps to AOCI and the Consolidated Statements of Operations: Years Ended September 30 2022 2021 2020 2022 2021 2020 2022 2021 2020 Description Gain/(Loss) Recognized in AOCI (Gain)/Loss Reclassified from AOCI into Interest Expense in the Consolidated Statements of Operations (Gain)/Loss Recognized in Interest Expense in the Consolidated Statements of Operations (Amount Excluded from Effectiveness Testing) (In millions) Cross-currency swaps $ 30 $ 7 $ 1 $ (6 ) $ (5 ) $ (5 ) $ 2 $ 2 $ 2

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Sep. 30, 2022
Compensation And Retirement Disclosure [Abstract]
Change in Benefit Obligations and Change in Plan Assets	The following provides information about projected benefit obligations, plan assets, the funded status and weighted-average assumptions of the defined benefit pension and postretirement benefit plans: Years Ended September 30 2022 2021 2022 2021 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Change in Benefit Obligations: Benefit obligation at beginning of year $ 3 $ 221 $ 99 $ 231 $ 25 $ 19 $ 27 $ 20 Service cost — 4 — 6 — — — — Interest cost — 4 — 3 — 1 — 1 Plan participants’ contribution — 1 — 1 — — — — Foreign currency exchange rate changes — (27 ) — 6 — (2 ) — 1 (Gain) loss from changes in actuarial assumptions and plan experience (1 ) (43 ) (1 ) (11 ) (4 ) (5 ) — (2 ) Benefits paid — (9 ) (3 ) (8 ) (3 ) — (2 ) (1 ) Settlements or curtailments — (2 ) (92 ) (8 ) (2 ) — — — Divestiture of a business — (16 ) — — — — — — Other — — — 1 — — — — Benefit obligation at end of year $ 2 $ 133 $ 3 $ 221 $ 16 $ 13 $ 25 $ 19 Years Ended September 30 2022 2021 2022 2021 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Change in Plan Assets: Fair value of plan assets at beginning of year $ — $ 217 $ 96 $ 204 $ — $ — $ — $ — Actual return on plan assets — (35 ) 1 14 — — — — Employer contribution — 5 — 7 5 — 2 1 Plan participants’ contribution — 1 — 1 — — — — Foreign currency exchange rate changes — (24 ) — 7 — — — — Benefits paid — (9 ) (3 ) (8 ) (3 ) — (2 ) (1 ) Settlements or curtailments — (2 ) (92 ) (8 ) (2 ) — — — Expenses paid from assets — — — — — — — — Divestiture of a business — (18 ) — — — — — — Other — — (2 ) — — — — — Fair value of plan assets at end of year $ — $ 135 $ — $ 217 $ — $ — $ — $ — Funded status $ (2 ) $ 2 $ (3 ) $ (4 ) $ (16 ) $ (13 ) $ (25 ) $ (19 ) Recognized asset (liability) $ (2 ) $ 2 $ (3 ) $ (4 ) $ (16 ) $ (13 ) $ (25 ) $ (19 )
Assumptions Used to Determine Pension Benefit Obligations and Periodic Benefit Costs, Postretirement Benefit Obligations and Net Costs	Pension Assumptions and Strategy The following assumptions were used to determine the pension benefit obligations and periodic benefit costs as of and for the years ended September 30: 2022 2021 2020 Pension Benefits U.S. Foreign U.S. Foreign U.S. Foreign Actuarial assumptions as of the year-end measurement date: Discount rate 5.5 % 4.5 % 2.2 % 2.1 % 3.1 % 1.7 % Rate of increase in compensation 3.0 % 3.0 % N/A 2.9 % N/A 3.0 % Cash balance interest credit rate 2.0 % 2.0 % 2.0 % 1.7 % 0.9 % 1.7 % Actuarial assumptions used to determine net periodic benefit cost during the year: Discount rate - benefit obligation 2.2 % 2.1 % 2.5 % 1.7 % 2.6 % 1.8 % Discount rate - service cost N/A 2.0 % N/A 1.7 % N/A 1.8 % Discount rate - interest cost 1.6 % 1.7 % 1.4 % 1.4 % 2.6 % 1.6 % Expected long-term rate of return on plan assets N/A 3.5 % N/A 4.6 % 2.5 % 5.2 % Rate of increase in compensation N/A 2.9 % N/A 3.0 % N/A 3.0 % Cash balance interest credit rate 2.0 % 1.7 % 2.1 % 1.7 % 0.9 % 1.9 % Postretirement Assumptions and Strategy The following assumptions were used to determine the postretirement benefit obligations and net costs as of and for the years ended September 30: 2022 2021 2020 Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign Actuarial assumptions as of the year-end measurement date: Discount rate 5.6 % 5.1 % 2.4 % 2.8 % 2.1 % 2.4 % Initial health care cost trend rate (1) — % 6.8 % 5.5 % 6.9 % 6.0 % 6.9 % Actuarial assumptions used to determine net cost during the year: Discount rate - benefit obligation 2.4 % 2.8 % 2.1 % 2.4 % 2.9 % 2.4 % Discount rate - service cost 1.7 % 3.5 % 1.5 % 3.0 % 2.6 % 2.9 % Discount rate - interest cost 1.6 % 2.5 % 1.4 % 2.1 % 2.5 % 2.3 % Initial health care cost trend rate 5.5 % 6.9 % 6.0 % 6.9 % 6.5 % 6.9 % (1)
Amounts Recognized in Consolidated Balance Sheets	Amounts recognized in the Consolidated Balance Sheets at September 30, 2022 and 2021 related to the Company's defined benefit pension and postretirement benefit plans were as follows: September 30 2022 2021 2022 2021 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Other assets $ — $ 26 $ — $ 35 $ — $ — $ — $ — Accounts payable and accrued liabilities $ — $ (1 ) $ (1 ) $ (1 ) $ (2 ) $ (1 ) $ (3 ) $ (1 ) Other liabilities $ (2 ) $ (23 ) $ (2 ) $ (38 ) $ (14 ) $ (12 ) $ (22 ) $ (18 )
Amounts Recognized in AOCI	Amounts recognized in AOCI at September 30, 2022 and 2021 related to the Company's defined benefit pension and postretirement benefit plans were as follows: September 30 2022 2021 2022 2021 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Net actuarial (gain) loss $ — $ 23 $ 1 $ 20 $ (6 ) $ (4 ) $ (4 ) $ 2 Net prior service credit — (1 ) — — — — — — Balance in accumulated other comprehensive (income) loss, pretax $ — $ 22 $ 1 $ 20 $ (6 ) $ (4 ) $ (4 ) $ 2
Estimated Future Benefit Payments	Estimated Future Benefit Payments The Company expects that the following benefit payments will be made to plan participants in the years from 2023 to 2032: Pension Benefits Postretirement Benefits Years Ending September 30 U.S. Foreign U.S. Foreign (In millions) 2023 $ — $ 8 $ 2 $ 1 2024 $ — $ 10 $ 2 $ 1 2025 $ — $ 9 $ 2 $ 1 2026 $ — $ 9 $ 2 $ 1 2027 $ — $ 10 $ 2 $ 1 2028 - 2032 $ 1 $ 47 $ 6 $ 4
Net Periodic Defined Benefit Pension and Other Postretirement Benefit Costs	Net periodic defined benefit pension and other postretirement benefit costs include the following components: Years Ended September 30 2022 2021 2020 2022 2021 2020 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Service cost $ — $ 4 $ — $ 6 $ 1 $ 5 $ — $ — $ — $ — $ — $ — Interest cost — 4 — 3 4 3 — 1 — 1 1 — Expected return on plan assets — (6 ) — (10 ) (3 ) (9 ) — — — — — — Amortization of net losses — 1 — 3 — 3 — — — — (1 ) 1 Settlements or Curtailments cost — — 4 1 3 1 (1 ) — — — — — Other — — — 2 — — — — — — — — Net periodic (benefit) cost $ — $ 3 $ 4 $ 5 $ 5 $ 3 $ (1 ) $ 1 $ — $ 1 $ — $ 1
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss), Pre-Tax	Other changes in plan assets and benefit obligations recognized in Other comprehensive income (loss) are as follows: Years Ended September 30 2022 2021 2020 2022 2021 2020 Pension Benefits Postretirement Benefits U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign U.S. Foreign (In millions) Net (gains) losses $ — $ (2 ) $ (2 ) $ (15 ) $ (4 ) $ 8 $ (4 ) $ (4 ) $ — $ (2 ) $ 1 $ (1 ) Prior service (credit) cost — — — (1 ) — — — — — — — — Amortization of prior unrecognized loss — (1 ) — (3 ) — (3 ) — — — — 1 (1 ) Loss on divestiture — (2 ) — — — — — — — — (Loss) gain on settlements — — (4 ) (1 ) (3 ) (1 ) 1 — — — — — Net changes recognized in Total other comprehensive (income) loss (1) $ — $ (5 ) $ (6 ) $ (20 ) $ (7 ) $ 4 $ (3 ) $ (4 ) $ — $ (2 ) $ 2 $ (2 ) (1) The tax impact on pension and other postretirement benefit liability adjustments arising during the period was a tax benefit of $3 million, a tax benefit of $8 million, and a tax provision of less than $1 million for fiscal 2022, 2021, and 2020
Defined Benefit Pension Plans Weighted-Average Asset Allocations	The Company’s foreign defined benefit pension plans weighted-average asset allocations at September 30, 2022 and 2021 by asset category, are as follows: September 30 2022 2021 Equity securities 20 % 21 % Debt securities 68 % 73 % Real estate 7 % 2 % Cash and other securities 5 % 4 % Total 100 % 100 %
Fair Value of Pension Plan Assets by Asset Category	The fair value of the Company’s pension plan assets at September 30, 2022 and 2021 by asset category is as follows: September 30 2022 2021 Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Total Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Observable Inputs (Level 2) Total (In millions) Cash $ 1 $ — $ 1 $ — $ — $ — Direct investments: U.S government bonds — — — — — — U.S. corporate bonds — — — — — — Non-U.S. equities 4 — 4 4 — 4 Non-U.S. government bonds 1 — 1 2 — 2 Non-U.S. corporate bonds 2 — 2 3 — 3 Mortgage backed securities — 1 1 — 1 1 Other fixed income 1 — 1 1 — 1 Total direct investments 8 1 9 10 1 11 Investment funds: Equity funds (1) — 23 23 — 42 42 Fixed income funds (2) — 86 86 — 155 155 Real estate funds (3) — 9 9 — 3 3 Cash equivalent funds 1 — 1 1 — 1 Other investment funds — 1 1 — — — Total investment funds 1 119 120 1 200 201 Alternative investments: Insurance contracts (4) — 5 5 — 5 5 Other alternative investments — — — — — — Total alternative investments — 5 5 — 5 5 Total pension plan assets $ 10 $ 125 $ 135 $ 11 $ 206 $ 217 (1) The equity funds asset class includes funds that invest in U.S. equities as well as equity securities issued by companies incorporated, listed or domiciled in countries in developed and/or emerging markets. These companies may be in the small-, mid- or large-cap categories. (2) The fixed income funds asset class includes investments in high quality funds. High quality fixed income funds primarily invest in low risk U.S. and non-U.S. government securities, investment-grade corporate bonds, mortgages and asset-backed securities. A significant portion of the fixed income funds include investment in long-term bond funds. (3) The real estate funds asset class includes funds that primarily invest in entities which are principally engaged in the ownership, acquisition, development, financing, sale and/or management of income-producing real estate properties, both commercial and residential. These funds typically seek long-term growth of capital and current income that is above average relative to public equity funds. (4) Insurance contracts held by the Company’s non-U.S. plans are issued by well-known, highly rated insurance companies.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Sep. 30, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation Expenses	The following table presents stock-based compensation expenses included in the Company’s Consolidated Statements of Operations: Years Ended September 30 2022 2021 2020 (In millions) Cost of sales $ 3 $ 2 $ 1 Selling and administrative expenses 18 17 7 Research and technical expenses 2 2 1 Stock-based compensation expense 23 21 9 Income tax benefit (1 ) (1 ) — Net stock-based compensation expense $ 22 $ 20 $ 9
Equity Incentive Plan Activity	The following table summarizes the total stock option and restricted stock unit activity in the equity incentive plans for fiscal 2022: Stock Options Restricted Stock Units Total Options (4) Weighted Average Exercise Price Restricted Stock Units ( 1) Weighted Average Grant Date Fair Value (Shares in thousands) Outstanding at September 30, 2021 1,476 $ 48.36 859 $ 45.82 Granted 242 $ 58.27 280 $ 58.72 Performance-based adjustment ( 2) — $ — 122 $ 48.66 Exercised / Vested (136 ) $ 47.52 (213 ) $ 49.35 Cancelled / Forfeited (8 ) $ 62.24 (36 ) $ 46.85 Outstanding at September 30, 2022 (3) 1,574 $ 49.89 1,012 $ 48.95 Exercisable at September 30, 2022 923 $ 50.31 (1) The number granted represents the number of shares issuable upon vesting of time-based restricted stock units and performance-based restricted stock units, assuming the Company performs at the target performance level in each year of the three-year performance period. (2) Represents the net incremental number of shares issuable upon vesting of performance-based restricted stock units based on the Company’s actual financial performance metrics for fiscal 2022. (3) Stock options outstanding include options vested and expected to vest in the future and have a weighted average remaining contractual life of 6.81 (4) Unvested stock options were approximately 651,000 49.30
Weighted-Average Assumptions	The fair values on the grant date were calculated using the following weighted-average assumptions: Years Ended September 30 2022 2021 2020 Expected stock price volatility 35 % 36 % 28 % Risk free interest rate 1.4 % 0.6 % 1.9 % Expected life of options (years) 6 6 6 Expected annual dividends per year $ 1.40 $ 1.40 $ 1.40

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Sep. 30, 2022
Equity [Abstract]
Changes in Each Component of AOCI, Net of Tax	Changes in each component of AOCI, net of tax, are as follows for fiscal 2021 and 2022: Currency Translation Adjustment Pension and Other Postretirement Benefit Liability Adjustment Total (In millions) Balance at September 30, 2020 attributable to Cabot Corporation $ (307 ) $ (44 ) $ (351 ) Other comprehensive income (loss) before reclassifications 52 20 72 Amounts reclassified from AOCI (3 ) — (3 ) Less: Other comprehensive income (loss) attributable to noncontrolling interests 7 — 7 Balance at September 30, 2021 attributable to Cabot Corporation (265 ) (24 ) (289 ) Other comprehensive income (loss) before reclassifications (208 ) 12 (196 ) Amounts reclassified from AOCI 29 2 31 Less: Other comprehensive income (loss) attributable to noncontrolling interests (15 ) — (15 ) Balance at September 30, 2022 attributable to Cabot Corporation $ (429 ) $ (10 ) $ (439 )
Amounts Reclassified Out of AOCI	The amounts reclassified out of AOCI and into the Consolidated Statements of Operations for fiscal 2022, 2021 and 2020 are as follows: Affected Line Item in the Consolidated Years Ended September 30 Statements of Operations 2022 2021 2020 (In Millions) Derivatives: net investment hedges (Gains) losses reclassified to interest expense Interest expense $ (6 ) $ (5 ) $ (5 ) (Gains) losses excluded from effectiveness testing and amortized to interest expense Interest expense 2 2 2 Release of current translation adjustment Loss on sale of business and asset impairment charge 33 — — Pension and other postretirement benefit liability adjustment Release of actuarial losses and prior service cost (credits) Loss on sale of business and asset impairment charge 2 — — Amortization of actuarial losses and prior service cost (credit) Net Periodic Benefit Cost - see Note M for details 1 3 3 Settlement and curtailment loss (gain) Net Periodic Benefit Cost - see Note M for details (1 ) 5 4 Total before tax $ 31 $ 5 $ 4

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Components of Basic and Diluted Earnings Per Common Share (EPS)	The following tables summarize the components of the basic and diluted earnings per common share (“EPS”) computations: Years Ended September 30 2022 2021 2020 (In millions, except per share amounts) Basic EPS: Net income (loss) attributable to Cabot Corporation $ 209 $ 250 $ (238 ) Less: Dividends and dividend equivalents to participating securities 1 1 — Less: Undistributed earnings allocated to participating securities (1) 2 2 — Earnings (loss) allocated to common shareholders (numerator) $ 206 $ 247 $ (238 ) Weighted average common shares and participating securities outstanding 57.4 57.5 57.3 Less: Participating securities (1) 0.9 0.8 0.7 Adjusted weighted average common shares (denominator) 56.5 56.7 56.6 Per share amounts—basic: Net income (loss) attributable to Cabot Corporation $ 3.65 $ 4.35 $ (4.21 ) Diluted EPS: Earnings (loss) allocated to common shareholders $ 206 $ 247 $ (238 ) Plus: Earnings allocated to participating securities 3 3 — Less: Adjusted earnings allocated to participating securities (2) 3 3 — Earnings (loss) available to common shares (numerator) $ 206 $ 247 $ (238 ) Adjusted weighted average common shares outstanding 56.5 56.7 56.6 Effect of dilutive securities: Common shares issuable (3) 0.4 0.1 — Adjusted weighted average common shares (denominator) 56.9 56.8 56.6 Per share amounts—diluted: Net income (loss) attributable to Cabot Corporation $ 3.62 $ 4.34 $ (4.21 ) (1) Participating securities consist of shares underlying all outstanding and achieved performance-based restricted stock units and all unvested time-based restricted stock units. The holders of these units are entitled to receive dividend equivalents payable in cash to the extent dividends are paid on the Company’s outstanding common stock and equal in value to the dividends that would have been paid in respect of the shares underlying such units.
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 shareholders. Undistributed earnings are allocated to common and participating shareholders on the same basis as dividend distributions. The calculation of undistributed earnings is as follows: Years Ended September 30 2022 2021 2020 (In millions) Calculation of undistributed earnings: Net income (loss) attributable to Cabot Corporation $ 209 $ 250 $ (238 ) Less: Dividends declared on common stock 84 80 80 Less: Dividends and dividend equivalents to participating securities 1 1 — Undistributed earnings (loss) $ 124 $ 169 $ (318 ) Allocation of undistributed earnings: Undistributed earnings (loss) allocated to common shareholders $ 122 $ 167 $ (318 ) Undistributed earnings allocated to participating securities 2 2 — Undistributed earnings (loss) $ 124 $ 169 $ (318 ) (2) Undistributed earnings (loss) 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 (i) assumed exercise of stock options issued under Cabot’s equity incentive plans; and (ii) assumed issuance of shares to employees pursuant to the Company’s Deferred Compensation and Supplemental Retirement Plan. For fiscal 2022, 2021, and 2020, respectively, 214,180, 525,131, and 1,821,018 incremental shares of common stock were excluded from the calculation of diluted earnings per share because the inclusion of these shares would have been antidilutive.

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income Before Income Taxes	Income from continuing operations before income taxes and equity in net earnings of affiliated companies was as follows: Years Ended September 30 2022 2021 2020 (In millions) Domestic $ (20 ) $ (73 ) $ (274 ) Foreign 355 479 241 Income from continuing operations before income taxes and equity in earnings of affiliated companies $ 335 $ 406 $ (33 )
Provision (Benefit) for Income Taxes	Tax provision (benefit) for income taxes consisted of the following: Years Ended September 30 2022 2021 2020 (In millions) U.S. federal and state: Current $ 7 $ 11 $ (1 ) Deferred 2 (1 ) 139 Total 9 10 138 Foreign: Current 135 103 62 Deferred (42 ) 10 (9 ) Total 93 113 53 Provision (benefit) for income taxes $ 102 $ 123 $ 191
Reconciliation Using U.S. Statutory Rate	The provision ( benefit Years Ended September 30 2022 2021 2020 (In millions) Computed tax expense at the federal statutory rate $ 70 $ 85 $ (7 ) Foreign impact of taxation at different rates, repatriation, valuation allowance, and other 38 8 4 Global Intangible Low Taxed Income (GILTI) 23 18 (4 ) Purification Solutions business divestiture (179 ) — — Impact of the Coronavirus Aid, Relief, and Economic Security ("CARES") Act of 2020 — 10 (10 ) Impact of increase (decrease) in valuation allowance on U.S. deferred taxes 160 (1 ) 228 U.S. and state benefits from research and experimentation activities (2 ) (2 ) (2 ) Provision (settlement) of unrecognized tax benefits 1 1 (7 ) Permanent differences, net 10 7 — State taxes, net of federal effect (19 ) (3 ) (11 ) Provision (benefit) for income taxes $ 102 $ 123 $ 191
Components of Deferred Income Taxes	Significant components of deferred income taxes were as follows: September 30 2022 2021 (In millions) Deferred tax assets: Deferred expenses $ 10 $ 14 Intangible assets 39 38 Inventory 15 13 Operating lease liability 21 21 Other 32 18 U.S. federal interest expense carryforward 33 24 Pension and other benefits 29 32 Net operating loss carryforwards 224 257 Capital loss carryforwards 137 — Foreign tax credit carryforwards 55 48 R&D credit carryforwards 47 46 Other business credit carryforwards 20 24 Subtotal 662 535 Valuation allowance (580 ) (470 ) Total deferred tax assets $ 82 $ 65 September 30 2022 2021 (In millions) Deferred tax liabilities: Property, plant and equipment $ (59 ) $ (47 ) Right of use asset (21 ) (20 ) Unremitted earnings of non-U.S. subsidiaries (22 ) (18 ) Total deferred tax liabilities $ (102 ) $ (85 )
Expiration Dates of NOLs, Capital Loss and Other Tax Credit Carryforwards Before Valuation Allowances	The following table provides detail surrounding the expiration dates of NOLs, capital loss and other tax credit carryforwards before valuation allowances: Years Ending September 30 NOLs/Capital Losses Credits (In millions) 2023 - 2029 $ 1,142 $ 26 2030 and thereafter 227 94 Indefinite carryforwards 723 2 Total $ 2,092 $ 122
Reconciliation of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of unrecognized tax benefits for fiscal 2022, 2021 and 2020 is as follows: Years Ended September 30 2022 2021 2020 (In millions) Balance at beginning of the year $ 21 $ 23 $ 27 Additions based on tax positions related to the current year 138 1 2 Additions for tax positions of prior years 2 — 2 Reductions of tax positions of prior years (1 ) (2 ) (1 ) Reductions related to settlements — — (5 ) Reductions from lapse of statute of limitations (1 ) (1 ) (2 ) Balance at end of the year $ 159 $ 21 $ 23

Leases (Tables)

Leases (Tables)	12 Months Ended
	Sep. 30, 2022
Leases [Abstract]
Components of Company's Lease Costs	The components of the Company’s lease costs were as follows: Years Ended September 30 2022 2021 2020 (In millions) Operating lease cost $ 23 $ 25 $ 32 Finance lease cost 6 7 6 Total lease cost $ 29 $ 32 $ 38
Supplemental Cash Flow Information Related to Company's Leases	Supplemental cash flow information related to the Company’s leases was as follows: Years Ended September 30 2022 2021 2020 (In millions) Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 17 $ 20 $ 25 Operating cash flows from finance leases 2 2 2 Financing cash flows from finance leases 4 3 3 Right-of-use assets obtained in exchange for new operating lease liabilities $ 14 $ 6 $ 14 Right-of-use assets obtained in exchange for new finance lease liabilities $ 1 $ 4 $ 24
Supplemental Balance Sheet Information Related to Company's Leases	Supplemental balance sheet information related to the Company’s leases was as follows: Description Balance Sheet Classification September 30, 2022 September 30, 2021 (In millions) Lease ROU assets: Operating Other assets $ 96 $ 90 Finance Net property, plant and equipment 41 44 Total lease ROU assets $ 137 $ 134 Lease liabilities: Current: Operating Accounts payable and accrued liabilities $ 14 $ 14 Finance Current portion of long-term debt 3 4 Long-term: Operating Other liabilities 83 84 Finance Long-term debt 26 29 Total lease liabilities $ 126 $ 131
Weighed Average Remaining Lease Term and Discount Rates	The following table presents the weighted-average remaining lease term and discount rates for the Company’s leases: Description September 30, 2022 September 30, 2021 Weighted-average remaining lease term (years): Operating leases 15 17 Finance leases 10 11 Weighted-average discount rate: Operating leases 2.97 % 2.41 % Finance leases 5.40 % 5.76 %
Future Minimum Lease Payments Under Non-cancelable Operating and Finance Leases	Future minimum lease payments under non-cancelable operating and finance leases as of September 30, 2022 were as follows: Years Ended September 30 Operating leases Finance leases (In millions) 2023 $ 16 $ 5 2024 14 4 2025 13 4 2026 11 4 2027 10 3 2028 and thereafter 51 16 Total lease payments 115 36 Less: imputed interest 18 7 Total $ 97 $ 29

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Sep. 30, 2022
Commitments And Contingencies Disclosure [Abstract]
Schedule of Components of Purchase Commitments	For these purchase commitments, the amounts included in the table below are based on market prices as of September 30, 2022 which may differ from actual market prices at the time of purchase. Payments Due by Fiscal Year 2023 2024 2025 2026 2027 Thereafter Total (In millions) Reinforcement Materials $ 251 $ 202 $ 201 $ 201 $ 186 $ 1,727 $ 2,768 Performance Chemicals 43 42 36 35 35 233 $ 424 Total $ 294 $ 244 $ 237 $ 236 $ 221 $ 1,960 $ 3,192

Financial Information by Segm_2

Financial Information by Segment & Geographic Area (Tables)	12 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Schedule of Performance Segment	The net sales from each of these businesses for fiscal 2022, 2021 and 2020 are as follows: Years Ended September 30 2022 2021 2020 (In millions) Performance Additives $ 1,013 $ 796 $ 645 Formulated Solutions 359 352 288 Total Performance Chemicals $ 1,372 $ 1,148 $ 933
Financial Information by Reportable Segment	Financial information by reportable segment is as follows: Years Ended September 30 Reinforcement Materials Performance Chemicals Purification Solutions Segment Total (1) Unallocated and Other (2), (4) Consolidated Total (In millions) 2022 Revenues from external customers (3) $ 2,575 $ 1,372 $ 97 $ 4,044 $ 277 $ 4,321 Depreciation and amortization $ 70 $ 72 $ 3 $ 145 $ 1 $ 146 Equity in earnings of affiliated companies $ 4 $ 5 $ 1 $ 10 $ — $ 10 Income (loss) from continuing operations before income taxes (4) $ 408 $ 234 $ — $ 642 $ (307 ) $ 335 Assets (5) $ 1,691 $ 1,458 $ — $ 3,149 $ 376 $ 3,525 Total expenditures for additions to long-lived assets (6) $ 114 $ 100 $ 3 $ 217 $ 4 $ 221 2021 Revenues from external customers (3) $ 1,781 $ 1,148 $ 257 $ 3,186 $ 223 $ 3,409 Depreciation and amortization $ 70 $ 73 $ 16 $ 159 $ 1 $ 160 Equity in earnings of affiliated companies $ — $ 2 $ 2 $ 4 $ (1 ) $ 3 Income (loss) from continuing operations before income taxes (4) $ 329 $ 211 $ 10 $ 550 $ (144 ) $ 406 Assets (5) $ 1,421 $ 1,325 $ 283 $ 3,029 $ 277 $ 3,306 Total expenditures for additions to long-lived assets (6) $ 104 $ 80 $ 9 $ 193 $ 5 $ 198 2020 Revenues from external customers (3) $ 1,256 $ 933 $ 253 $ 2,442 $ 172 $ 2,614 Depreciation and amortization $ 68 $ 64 $ 24 $ 156 $ 2 $ 158 Equity in earnings of affiliated companies $ — $ 1 $ 3 $ 4 $ (1 ) $ 3 Income (loss) from continuing operations before income taxes (4) $ 162 $ 118 $ 3 $ 283 $ (316 ) $ (33 ) Assets (5) $ 1,077 $ 1,145 $ 296 $ 2,518 $ 263 $ 2,781 Total expenditures for additions to long-lived assets (6) $ 66 $ 92 $ 8 $ 166 $ 3 $ 169 (1) Cabot divested its (2) 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. ( 3 ) 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 royalties, external shipping and handling fees, the impact of unearned revenue, discounting charges for certain Notes receivable, by-product revenue, and indirect tax settlement credits. Details are provided in the table below. Years Ended September 30 2022 2021 2020 (In millions) Shipping and handling fees $ 162 $ 153 $ 113 By-product sales 122 73 62 Other (7 ) (3 ) (3 ) Total $ 277 $ 223 $ 172 ( 4 ) Consolidated Total Income (loss) from continuing operations before income taxes reconciles to Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies on the Consolidated Statements of Operations. Total Income (loss) from continuing operations before income taxes that are categorized as Unallocated and Other includes: Years Ended September 30 2022 2021 2020 (In millions) Interest expense $ (56 ) $ (49 ) $ (53 ) Certain items: (a) Gain on bargain purchase of a business (Note C) $ 24 $ — $ — Gain on sale of land 17 — — Specialty Fluids divestiture related benefit 5 — — Employee benefit plan settlement and other charges (Note M) 1 (4 ) (10 ) Loss on sale of business and asset impairment charge (207 ) — — Legal and environmental matters and reserves (Note S) (9 ) (25 ) (54 ) Purification Solutions divestiture related charges (5 ) — — Acquisition and integration-related charges (6 ) (5 ) (5 ) Global restructuring activities (3 ) (11 ) (19 ) Marshall Mine loss on sale and asset impairment charge (Note D) — — (129 ) Inventory reserve adjustment — — (2 ) Specialty Fluids loss on sale and asset impairment charge — — (1 ) Indirect tax settlement credits — 12 3 Other certain items — (1 ) (1 ) Total certain items, pre-tax (183 ) (34 ) (218 ) Unallocated corporate costs (b) (59 ) (58 ) (41 ) General unallocated income (expense) (c) 1 — (1 ) Less: Equity in earnings of affiliated companies, net of tax (d) 10 3 3 Total $ (307 ) $ (144 ) $ (316 ) (a) Certain items are items that management does not consider representative of operating segment results and they are, therefore, excluded from Segment EBIT. (b) Unallocated corporate costs 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 income, dividend income, the profit or loss related to the corporate adjustment for unearned revenue, and the impact of including the full operating results of a contractual joint venture in Purification Solutions Segment EBIT. (d) Equity in earnings of affiliated companies, net of tax is included in Segment EBIT and is removed from Unallocated and other to reconcile to income (loss) from operations before taxes. ( 5 ) Unallocated and Other assets includes cash, marketable securities, cost investments, income taxes receivable, deferred taxes, headquarters’ assets, and current and non-current assets held for sale. ( 6 ) Expenditures for additions to long-lived assets include total equity and other investments (including available-for-sale securities) and property, plant and equipment.
Revenue from External Customers and Property, Plant and Equipment Information by Geographic Area	Revenues from external customers attributable to an individual country, other than the U.S. and China, were not material for disclosure. Revenues from external customers by individual country are summarized as follows: Years Ended September 30 2022 2021 2020 (In millions) United States $ 842 $ 668 $ 581 China 1,129 858 598 Other countries 2,350 1,883 1,435 Total $ 4,321 $ 3,409 $ 2,614 Property, plant and equipment attributable to an individual country, other than the U.S. and China, were not material for disclosure. Property, plant and equipment information by individual country is summarized as follows: Years Ended September 30 2022 2021 (In millions) United States $ 524 $ 513 China 333 333 Other countries 413 530 Total $ 1,270 $ 1,376
Revenues from External Customers by Geographic Region	Each of the Company’s segments operates globally. In addition to presenting Revenue from external customers by reportable segment, the following tables further disaggregate Revenue from external customers by geographic region. Year Ended September 30, 2022 Reinforcement Materials Performance Chemicals Purification Solutions Consolidated Total (In millions) Americas $ 1,057 $ 417 $ 43 $ 1,517 Asia Pacific 1,009 563 14 1,586 Europe, Middle East and Africa 509 392 40 941 Segment revenues from external customers 2,575 1,372 97 4,044 Unallocated and other 277 Net sales and other operating revenues $ 4,321 Year Ended September 30, 2021 Reinforcement Materials Performance Chemicals Purification Solutions Consolidated Total (In millions) Americas $ 699 $ 310 $ 110 $ 1,119 Asia Pacific 745 485 34 1,264 Europe, Middle East and Africa 337 353 113 803 Segment revenues from external customers 1,781 1,148 257 3,186 Unallocated and other 223 Net sales and other operating revenues $ 3,409 Year Ended September 30, 2020 Reinforcement Materials Performance Chemicals Purification Solutions Consolidated Total (In millions) Americas $ 490 $ 266 $ 112 $ 868 Asia Pacific 529 368 34 931 Europe, Middle East and Africa 237 299 107 643 Segment revenues from external customers 1,256 933 253 2,442 Unallocated and other 172 Net sales and other operating revenues $ 2,614

Significant Accounting Polici_3

Significant Accounting Policies - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Significant Accounting Policies [Line Items]
Equity affiliate investments	$ 20,000,000	$ 40,000,000
Capitalized interest	3,000,000	1,000,000	$ 2,000,000
Asset retirement obligation reserve	10,000,000	19,000,000
Charges on sale of notes receivables	3,000,000	2,000,000	2,000,000
Changes in allowance	$ 0	0
Chance of utilizing the associated benefit for valuation allowances, maximum	50%
Equity Method Investments [Member]
Significant Accounting Policies [Line Items]
Dividends declared	$ 1,000,000	5,000,000	3,000,000
Minimum [Member]
Significant Accounting Policies [Line Items]
Payment terms	0 days
Minimum [Member] | Buildings [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment	20 years
Minimum [Member] | Machinery and Equipment [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment	10 years
Minimum [Member] | Other Fixed Assets [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment	3 years
Minimum [Member] | Cabot [Member] | Equity Affiliate Investments [Member]
Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage	20%
Maximum [Member]
Significant Accounting Policies [Line Items]
Payment terms	90 days
Maximum [Member] | Buildings [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment	25 years
Maximum [Member] | Machinery and Equipment [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment	25 years
Maximum [Member] | Other Fixed Assets [Member]
Significant Accounting Policies [Line Items]
Useful life of property, plant and equipment	25 years
Maximum [Member] | Cabot [Member] | Equity Affiliate Investments [Member]
Significant Accounting Policies [Line Items]
Equity method investment, ownership percentage	50%
Other Nonoperating Income (Expense) [Member]
Significant Accounting Policies [Line Items]
Foreign currency transaction gain (loss)	$ (13,000,000)	(6,000,000)	$ (6,000,000)
China [Member]
Significant Accounting Policies [Line Items]
Accounts and notes receivable, net	$ 8,000,000	$ 5,000,000

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements - Additional Information (Detail)	1 Months Ended
	Aug. 31, 2022
Accounting Policies [Abstract]
Excise tax on stock repurchases	1%

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
	Feb. 28, 2022	Apr. 01, 2020	Jun. 30, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Businesses acquisition, net of cash acquired				$ 9		$ 92
Gain on bargain purchase of a business				24
Assumed debt repaid				$ 372	$ 222	$ 410
Tokai Carbon Group Tianjin Co
Business Acquisition [Line Items]
Business acquisition, purchase price	$ 9
Business acquisition, cash consideration	14
Businesses acquisition, net of cash acquired	5
Gain on bargain purchase of a business	24
Tokai Carbon Group Tianjin Co | Accounts Payable and Accrued Liabilities [Member]
Business Acquisition [Line Items]
Gain on bargain purchase of a business	$ 24
Tokai Carbon Group Tianjin Co | Tokai Carbon's Registered Capital [Member]
Business Acquisition [Line Items]
Business acquisition, ownership percentage	100%
Shenzhen Sanshun Nano New Materials Co., Ltd [Member]
Business Acquisition [Line Items]
Business acquisition, purchase price		$ 100
Business acquisition, cash consideration		84
Businesses acquisition, net of cash acquired		1
Business acquisition, assumed debt		13
Assumed debt repaid			$ 13
Business combination contingent consideration milestone payment		$ 3

Acquisition - Schedule of Estim

Acquisition - Schedule of Estimates of Fair Value of Assets and Liabilities Acquired (Detail) - USD ($) $ in Millions		12 Months Ended
	Feb. 28, 2022	Sep. 30, 2022
Fair value of liabilities assumed
Gain on bargain purchase of a business		$ 24
Tokai Carbon Group Tianjin Co
Fair value of asset acquired
Cash	$ 5
Accounts and notes receivable	5
Inventories	11
Prepaid expenses and other current assets	7
Property, plant and equipment	12
Amounts attributable to assets acquired	40
Fair value of liabilities assumed
Accounts payable and accrued liabilities	(2)
Amounts attributable to liabilities assumed	(2)
Total identifiable net assets	38
Business acquisition, cash consideration	14
Gain on bargain purchase of a business	$ 24

Divestitures - Additional Infor

Divestitures - Additional Information (Detail) - USD ($) $ in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 01, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2022	Sep. 30, 2020	Sep. 30, 2021
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business				$ 79
Accounts and notes receivable				836		$ 645
Purification Solutions [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business		$ 79
Proceeds from divestiture of cash transferred		10
Accounts and notes receivable				10
Impairment charge			$ 197	207
Pre-tax loss on sale				10
Impairment charge after tax				$ 171
Marshall Mine [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Impairment charge					$ 129
One Equity Partners [Member] | Purification Solutions [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Proceeds from sale of business	$ 89
Proceeds from divestiture of cash transferred	$ 7
ADA Carbon Solutions, LLC [Member] | Marshall Mine [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Accounts payable and accrued liabilities		$ 11

Inventories - Components of Com

Inventories - Components of Company's Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 182	$ 168
Finished goods	427	300
Other	55	55
Total	$ 664	$ 523

Inventories - Additional Inform

Inventories - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Inventory Disclosure [Abstract]
Obsolete inventory reserve	$ 9	$ 20

Property, Plant and Equipment -

Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Property Plant And Equipment [Abstract]
Land and land improvements	$ 75	$ 114
Buildings	553	575
Machinery and equipment	2,473	2,765
Other	229	241
Construction in progress	224	190
Total property, plant and equipment	3,554	3,885
Less: Accumulated depreciation	(2,284)	(2,509)
Net property, plant and equipment	$ 1,270	$ 1,376

Property, Plant and Equipment_2

Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Property Plant And Equipment [Abstract]
Depreciation expense	$ 140	$ 152	$ 151

Goodwill and Intangible Asset_2

Goodwill and Intangible Assets - Schedule of Goodwill Balances (Detail) $ in Millions	12 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill And Intangible Assets [Line Items]
Beginning balance	$ 140	[1]
Foreign currency impact	(11)
Ending balance	129
Reinforcement Materials [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	48	[1]
Foreign currency impact	(2)
Ending balance	46
Performance Chemicals [Member]
Goodwill And Intangible Assets [Line Items]
Beginning balance	92	[1]
Foreign currency impact	(9)
Ending balance	$ 83
[1] The balance as of September 30, 2021 included $444 million of accumulated impairment losses associated with the goodwill of Purification Solutions segment.

Goodwill and Intangible Asset_3

Goodwill and Intangible Assets - Schedule of Goodwill Balances (Parenthetical) (Detail)	Sep. 30, 2021 USD ($)
Purification Solutions [Member]
Goodwill And Intangible Assets [Line Items]
Accumulated impairment losses	$ 444,000,000
Reinforcement Materials [Member]
Goodwill And Intangible Assets [Line Items]
Accumulated impairment losses	0
Performance Chemicals [Member]
Goodwill And Intangible Assets [Line Items]
Accumulated impairment losses	$ 0

Goodwill and Intangible Asset_4

Goodwill and Intangible Assets - Schedule of Intangible Assets with Finite Lives (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	$ 95	$ 133
Accumulated Amortization	(32)	(33)
Net Intangible Assets, finite lives	63	100
Developed Technologies [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	34	62
Accumulated Amortization	(8)	(12)
Net Intangible Assets, finite lives	26	50
Trademarks [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	2	11
Accumulated Amortization	(1)	(1)
Net Intangible Assets, finite lives	1	10
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value, finite lives	59	60
Accumulated Amortization	(23)	(20)
Net Intangible Assets, finite lives	$ 36	$ 40

Goodwill and Intangible Asset_5

Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
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	$ 6	$ 8	$ 7
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

Accounts Payable, Accrued Lia_3

Accounts Payable, Accrued Liabilities and Other Liabilities - Components of Accounts Payable and Accrued Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Payables And Accruals [Abstract]
Accounts payable	$ 533	$ 480
Accrued employee compensation	66	75
Other accrued liabilities	108	112
Total	$ 707	$ 667

Accounts Payable, Accrued Lia_4

Accounts Payable, Accrued Liabilities and Other Liabilities - Components of Other Long-Term Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Payables And Accruals [Abstract]
Employee benefit plan liabilities	$ 51	$ 80
Operating lease liabilities	83	84
Other accrued liabilities	100	115
Total	$ 234	$ 279

Debt and Other Obligations - Ad

Debt and Other Obligations - Additional Information (Detail)	1 Months Ended					12 Months Ended
	Aug. 31, 2022	Jun. 30, 2022 USD ($)	Aug. 31, 2021 USD ($) Option	Jun. 30, 2019 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	May 31, 2019 EUR (€)
Debt Instrument [Line Items]
Revolving credit facility, committed amount						$ 1,000,000,000
Short-term borrowings						347,000,000	$ 72,000,000
Revolving credit facility, cap amount used to calculate net debt						150,000,000
Long-term debt						1,076,000,000
Unsecured medium term notes outstanding issued						$ 8,000,000	23,000,000
Maturity of the total outstanding medium term notes, years						5 years
Weighted average interest of medium term notes						7.24%
Chinese Renminbi Debt [Member]
Debt Instrument [Line Items]
Long-term debt						$ 4,000,000	$ 4,000,000
3.7% Notes due fiscal 2022 [Member]
Debt Instrument [Line Items]
Debt maturity date						Jul. 15, 2022
Debt instrument, interest rate						3.70%	3.70%
Unsecured notes issued		$ 350,000,000
Debt instrument due, year						2022	2022
3.7% Notes due fiscal 2022 [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		3.70%
3.4% Notes due fiscal 2026 [Member]
Debt Instrument [Line Items]
Debt maturity date						Sep. 15, 2026
Debt instrument, interest rate						3.40%	3.40%
Unsecured notes issued					$ 250,000,000
Debt instrument, discount					$ 1,000,000
Proceeds from issuance of unsecured notes						$ 248,000,000
Debt instrument due, year						2026	2026
3.4% Notes due fiscal 2026 [Member] | Fixed Rate Debt [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate					3.40%
Debt instrument due, year						2026
4.0% Notes due 2029 [Member]
Debt Instrument [Line Items]
Debt issuance cost				$ 3,000,000
Debt maturity date				Jul. 01, 2029
Debt instrument, interest rate				4%		4%	4%
Unsecured notes issued				$ 300,000,000
Debt instrument, discount				1,000,000
Proceeds from issuance of unsecured notes				$ 296,000,000
Debt instrument due, year				2029		2029	2029
5.0% Notes due fiscal 2032 [Member]
Debt Instrument [Line Items]
Debt issuance cost		$ 3,000,000
Debt maturity date		Jun. 30, 2032
Debt instrument, interest rate		5%				5%	5%
Unsecured notes issued		$ 400,000,000
Debt instrument, discount		3,000,000
Proceeds from issuance of unsecured notes		$ 394,000,000
Debt instrument due, year		2032				2032	2032
Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, covenant, ratio of consolidated total debt to consolidated EBITDA						3.50%
Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, covenant, ratio of consolidated total debt to consolidated EBITDA						1%
Revolving Credit Facility, expires fiscal 2026 [Member]
Debt Instrument [Line Items]
Revolving credit facility, committed amount			$ 1,000,000,000
Debt instrument, maturity date			Aug. 06, 2026
Amount available under credit facility						$ 678,000,000
Revolving credit facility, number of options to extend | Option			1
Revolving credit facility, options extension period			1 year
Line of credit facility, commitment fee percentage	0.01%
Line of credit facility, interest rate during period	0.05%
Revolving Credit Facility - Euro, expires fiscal 2024 [Member]
Debt Instrument [Line Items]
Revolving credit facility, committed amount | €								€ 300,000,000
Debt instrument, maturity date						May 22, 2024
Revolving credit facility, weighted average interest rate						1.82%
Credit agreement, available borrowing						$ 178,000,000
Debt issuance cost						$ 1,000,000
Debt instrument due, year						2024	2024
Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Debt instrument due, year						2024
Standby letters of credit, outstanding amount						$ 7,000,000
Commercial Paper [Member]
Debt Instrument [Line Items]
Short-term borrowings						$ 322,000,000	$ 71,000,000
Weighted-average interest rate						3.35%	0.15%
Line of Credit
Debt Instrument [Line Items]
Line of credit interest rate						3.70%
Line of credit outstanding balance						$ 25,000,000
Line of credit facility, established date						Mar. 01, 2022
Debt instrument, maturity date						Feb. 28, 2023

Debt and Other Obligations - Sc

Debt and Other Obligations - Schedule of Long-Term Obligations (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Total variable rate debt	$ 114	$ 134
Total Medium Term Notes	8	23
Debt	1,076
Total debt	962	927
Finance lease obligations (Note R)	29	33
Unamortized debt issuance costs and debt discount	(9)	(4)
Total debt	1,096	1,090
Less current portion of long-term debt	(7)	(373)
Total long-term debt	1,089	717
Revolving Credit Facility - Euro, expires fiscal 2024 [Member]
Debt Instrument [Line Items]
Line of credit	114	134
3.7% Notes due fiscal 2022 [Member]
Debt Instrument [Line Items]
Notes		350
3.4% Notes due fiscal 2026 [Member]
Debt Instrument [Line Items]
Notes	250	250
5.0% Notes due fiscal 2032 [Member]
Debt Instrument [Line Items]
Notes	400
Notes due fiscal 2022, 8.34% - 8.47% [Member]
Debt Instrument [Line Items]
Total Medium Term Notes		15
Notes due fiscal 2028, 6.57% - 7.28% [Member]
Debt Instrument [Line Items]
Total Medium Term Notes	8	8
4.0% Notes due fiscal 2029 [Member]
Debt Instrument [Line Items]
Notes	300	300
Chinese Renminbi Debt, Due Fiscal 2023, 4.35% [Member]
Debt Instrument [Line Items]
Debt	$ 4	$ 4

Debt and Other Obligations - _2

Debt and Other Obligations - Schedule of Long-Term Obligations (Parenthetical) (Detail)	1 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2019	Sep. 30, 2022	Sep. 30, 2021
Revolving Credit Facility Expiry October 2026 [Member]
Debt Instrument [Line Items]
Debt instrument due, year			2026	2026
Revolving Credit Facility - Euro, expires fiscal 2024 [Member]
Debt Instrument [Line Items]
Debt instrument due, year			2024	2024
3.7% Notes due fiscal 2022 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			3.70%	3.70%
Debt instrument due, year			2022	2022
3.4% Notes due fiscal 2026 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			3.40%	3.40%
Debt instrument due, year			2026	2026
5.0% Notes due fiscal 2032 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate	5%		5%	5%
Debt instrument due, year	2032		2032	2032
4.0% Notes due 2029 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate		4%	4%	4%
Debt instrument due, year		2029	2029	2029
Notes due fiscal 2022, 8.34% - 8.47% [Member]
Debt Instrument [Line Items]
Debt instrument due, year			2022	2022
Notes due fiscal 2022, 8.34% - 8.47% [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			8.34%	8.34%
Notes due fiscal 2022, 8.34% - 8.47% [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			8.47%	8.47%
Notes due fiscal 2028, 6.57% - 7.28% [Member]
Debt Instrument [Line Items]
Debt instrument due, year			2028	2028
Notes due fiscal 2028, 6.57% - 7.28% [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			6.57%	6.57%
Notes due fiscal 2028, 6.57% - 7.28% [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			7.28%	7.28%
Chinese Renminbi Debt, Due Fiscal 2023, 4.35% [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate			4.35%	4.35%
Debt instrument due, year			2023	2023

Debt and Other Obligations - _3

Debt and Other Obligations - Schedule of Future Years Payment (Detail) $ in Millions	Sep. 30, 2022 USD ($)
Debt Disclosure [Abstract]
2023	$ 4
2024	114
2026	250
Thereafter	708
Total	$ 1,076

Financial Instruments and Fai_2

Financial Instruments and Fair Value Measurements - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
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
Fair value of long-term debt	1,060,000,000	1,130,000,000
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	8,000,000	10,000,000
Significant Observable Inputs (Level 2) [Member] | 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, net	28,000,000	3,000,000
Fixed Rate Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of long-term debt	$ 1,080,000,000	$ 1,060,000,000

Derivatives - Additional Inform

Derivatives - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2022 USD ($) Derivative	Sep. 30, 2021 USD ($) Derivative	Sep. 30, 2020 USD ($)
Derivative [Line Items]
Significant concentration of credit risk associated with our derivative instruments	$ 0	$ 0
Maximum [Member]
Derivative [Line Items]
Fair value of derivative instruments not designated as hedges, liability	1,000,000	1,000,000
Fair value of derivative instruments not designated as hedges, asset		1,000,000
Cross Currency Swaps [Member]
Derivative [Line Items]
Fair value of swaps, net asset	$ 29,000,000	$ 3,000,000
Fair Value Hedging [Member] | Interest Rate Swap-Fixed to Variable [Member] | Interest Rate Risk [Member]
Derivative [Line Items]
Derivatives held to manage interest rate risk | Derivative	0	0
Net Investment Hedge [Member] | Cross Currency Swaps [Member]
Derivative [Line Items]
Notional Amount	$ 250,000,000
Net cash interest received	4,000,000	$ 3,000,000	$ 4,000,000
Cumulative gain related to swaps	$ 32,000,000	$ 6,000,000
Net Investment Hedge [Member] | Cross Currency Swaps [Member] | Fixed Rate Debt [Member]
Derivative [Line Items]
Derivative Instruments Frequency of Cash Settlements	semi-annually

Derivatives - Details of Deriva

Derivatives - Details of Derivatives Held to Manage Foreign Currency Risk (Detail)		Sep. 30, 2022 USD ($)	Sep. 30, 2022 EUR (€)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 EUR (€)	Sep. 30, 2016
3.4% Notes [Member]
Derivative [Line Items]
Interest rate on borrowing		3.40%	3.40%	3.40%	3.40%
3.4% Notes [Member] | Fixed Rate Debt [Member]
Derivative [Line Items]
Interest rate on borrowing						3.40%
Net Investment Hedge [Member] | Cross Currency Swaps [Member]
Derivative [Line Items]
Notional Amount		$ 250,000,000
Net Investment Hedge [Member] | 3.4% Notes [Member] | Cross Currency Swaps [Member]
Derivative [Line Items]
Notional Amount		$ 250,000,000	€ 223,000,000	$ 250,000,000	€ 223,000,000
Net Investment Hedge [Member] | 3.4% Notes [Member] | Fixed Rate Debt [Member] | Cross Currency Swaps [Member]
Derivative [Line Items]
Interest rate on borrowing		3.40%	3.40%	3.40%	3.40%
Not Designated as Hedging Instrument [Member] | Forward Foreign Currency Contracts [Member]
Derivative [Line Items]
Notional Amount	[1]	$ 42,000,000		$ 48,000,000
[1]At both September 30, 2022 and 2021, Cabot’s forward foreign exchange contracts were denominated in Indonesian rupiah and Czech koruna.

Derivatives - Summary Impact of

Derivatives - Summary Impact of Cross-currency Swaps to AOCI and Consolidated Statements of Operations (Detail) - Cross Currency Swaps [Member] - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Derivative Instruments Gain Loss [Line Items]
Gain/(Loss) Recognized in AOCI	$ 30	$ 7	$ 1
(Gain)/Loss Reclassified from AOCI into Interest Expense in the Consolidated Statements of Operations	$ (6)	$ (5)	$ (5)
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]	Interest Expense	Interest Expense	Interest Expense
(Gain)/Loss Recognized in Interest Expense in the Consolidated Statements of Operations (Amount Excluded from Effectiveness Testing)	$ 2	$ 2	$ 2

Insurance Recoveries - Addition

Insurance Recoveries - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Pepinster, Belgium [Member] | Flood [Member]
Business Interruption Loss [Line Items]
Flood-related expenses	$ 6	$ 17
Insurance proceeds	11	8
Cash provided by operating activities	10	6
Cash provided by investing activities	1	2
Pepinster, Belgium [Member] | Flood [Member] | Prepaid Expenses and Other Current Assets
Business Interruption Loss [Line Items]
Insurance settlements receivable	4	$ 9
Franklin, Louisiana [Member] | Equipment Failure [Member]
Business Interruption Loss [Line Items]
Insurance proceeds	$ 8

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plans expenses		$ 15	$ 18	$ 19
Pension Benefits [Member] | Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected contribution	$ 4
Postretirement Benefits [Member] | Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Postretirement medical benefits	$ 3
U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		2	3
Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		$ 125	$ 209
Foreign Plans [Member] | Equity [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of weighted-average target asset allocation		18%
Foreign Plans [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of weighted-average target asset allocation		67%
Foreign Plans [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of weighted-average target asset allocation		11%
Foreign Plans [Member] | Cash and Other Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of weighted-average target asset allocation		4%

Employee Benefit Plans - Change

Employee Benefit Plans - Change in Projected Benefit Obligations and Change in Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Change in Plan Assets:
Fair value of plan assets at beginning of year	$ 217
Fair value of plan assets at end of year	135	$ 217
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]
Change in Benefit Obligations:
Benefit obligation at beginning of year	3	99
Service cost			$ 1
Interest cost			4
(Gain) loss from changes in actuarial assumptions and plan experience	(1)	(1)
Benefits paid		(3)
Settlements or curtailments		$ (92)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (expense)
Benefit obligation at end of year	2	$ 3	99
Change in Plan Assets:
Fair value of plan assets at beginning of year		96
Actual return on plan assets		1
Benefits paid		(3)
Settlements or curtailments		(92)
Other		(2)
Fair value of plan assets at end of year			96
Funded status	(2)	(3)
Recognized asset (liability)	(2)	(3)
Pension Benefits [Member] | Foreign Plans [Member]
Change in Benefit Obligations:
Benefit obligation at beginning of year	221	231
Service cost	4	6	5
Interest cost	$ 4	$ 3	3
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (expense)	Other income (expense)
Plan participants’ contribution	$ 1	$ 1
Foreign currency exchange rate changes	(27)	6
(Gain) loss from changes in actuarial assumptions and plan experience	(43)	(11)
Benefits paid	(9)	(8)
Settlements or curtailments	$ (2)	$ (8)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (expense)	Other income (expense)
Divestiture of a business	$ (16)
Other		$ 1
Benefit obligation at end of year	133	221	231
Change in Plan Assets:
Fair value of plan assets at beginning of year	217	204
Actual return on plan assets	(35)	14
Employer contribution	5	7
Plan participants’ contribution	1	1
Foreign currency exchange rate changes	(24)	7
Benefits paid	(9)	(8)
Settlements or curtailments	(2)	(8)
Divestiture of a business	(18)
Fair value of plan assets at end of year	135	217	204
Funded status	2	(4)
Recognized asset (liability)	2	(4)
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]
Change in Benefit Obligations:
Benefit obligation at beginning of year	25	27
Interest cost			1
(Gain) loss from changes in actuarial assumptions and plan experience	(4)
Benefits paid	(3)	(2)
Settlements or curtailments	$ (2)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement and Curtailment Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (expense)
Benefit obligation at end of year	$ 16	25	27
Change in Plan Assets:
Employer contribution	5	2
Benefits paid	(3)	(2)
Settlements or curtailments	(2)
Funded status	(16)	(25)
Recognized asset (liability)	(16)	(25)
Postretirement Benefits [Member] | Foreign Plans [Member]
Change in Benefit Obligations:
Benefit obligation at beginning of year	19	20
Interest cost	$ 1	$ 1
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (expense)	Other income (expense)
Foreign currency exchange rate changes	$ (2)	$ 1
(Gain) loss from changes in actuarial assumptions and plan experience	(5)	(2)
Benefits paid		(1)
Benefit obligation at end of year	13	19	$ 20
Change in Plan Assets:
Employer contribution		1
Benefits paid		(1)
Funded status	(13)	(19)
Recognized asset (liability)	$ (13)	$ (19)

Employee Benefit Plans - Assump

Employee Benefit Plans - Assumptions Used to Determine Pension Benefit Obligations and Periodic Benefit Costs, Postretirement Benefit Obligations and Net Costs (Detail)		12 Months Ended
		Sep. 30, 2022	Sep. 30, 2021		Sep. 30, 2020
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate		5.50%	2.20%		3.10%
Initial health care cost trend rate		3%
Cash balance interest credit rate		2%	2%		0.90%
Discount rate - benefit obligation		2.20%	2.50%		2.60%
Discount rate - interest cost		1.60%	1.40%		2.60%
Expected long-term rate of return on plan assets					2.50%
Cash balance interest credit rate		2%	2.10%		0.90%
Pension Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate		4.50%	2.10%		1.70%
Initial health care cost trend rate		3%	2.90%		3%
Cash balance interest credit rate		2%	1.70%		1.70%
Discount rate - benefit obligation		2.10%	1.70%		1.80%
Discount rate - service cost		2%	1.70%		1.80%
Discount rate - interest cost		1.70%	1.40%		1.60%
Expected long-term rate of return on plan assets		3.50%	4.60%		5.20%
Initial health care cost trend rate		2.90%	3%		3%
Cash balance interest credit rate		1.70%	1.70%		1.90%
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate		5.60%	2.40%		2.10%
Initial health care cost trend rate		0%	5.50%	[1]	6%	[1]
Discount rate - benefit obligation		2.40%	2.10%		2.90%
Discount rate - service cost		1.70%	1.50%		2.60%
Discount rate - interest cost		1.60%	1.40%		2.50%
Initial health care cost trend rate		5.50%	6%		6.50%
Postretirement Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate		5.10%	2.80%		2.40%
Initial health care cost trend rate	[1]	6.80%	6.90%		6.90%
Discount rate - benefit obligation		2.80%	2.40%		2.40%
Discount rate - service cost		3.50%	3%		2.90%
Discount rate - interest cost		2.50%	2.10%		2.30%
Initial health care cost trend rate		6.90%	6.90%		6.90%
[1]The Initial health care cost trend rate is set at zero for the 2022 U.S. plan assumptions in light of the expected downward adjustment the U.S. government is expected to make to the 2023 Medicare Part B premiums.

Employee Benefit Plans - Assu_2

Employee Benefit Plans - Assumptions Used to Determine Pension Benefit Obligations and Periodic Benefit Costs, Postretirement Benefit Obligations and Net Costs (Parenthetical) (Detail)	Sep. 30, 2022	Sep. 30, 2021		Sep. 30, 2020
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Initial health care cost trend rate	0%	5.50%	[1]	6%	[1]
[1]The Initial health care cost trend rate is set at zero for the 2022 U.S. plan assumptions in light of the expected downward adjustment the U.S. government is expected to make to the 2023 Medicare Part B premiums.

Employee Benefit Plans - Amount

Employee Benefit Plans - Amounts Recognized in Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accounts payable and accrued liabilities		$ (1)
Other liabilities	$ (2)	(2)
Pension Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Other assets	26	35
Accounts payable and accrued liabilities	(1)	(1)
Other liabilities	(23)	(38)
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accounts payable and accrued liabilities	(2)	(3)
Other liabilities	(14)	(22)
Postretirement Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Accounts payable and accrued liabilities	(1)	(1)
Other liabilities	$ (12)	$ (18)

Employee Benefit Plans - Amou_2

Employee Benefit Plans - Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss		$ 1
Balance in accumulated other comprehensive (income) loss, pretax		1
Pension Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss	$ 23	20
Net prior service credit	(1)
Balance in accumulated other comprehensive (income) loss, pretax	22	20
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss	(6)	(4)
Balance in accumulated other comprehensive (income) loss, pretax	(6)	(4)
Postretirement Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net actuarial (gain) loss	(4)	2
Balance in accumulated other comprehensive (income) loss, pretax	$ (4)	$ 2

Employee Benefit Plans - Estima

Employee Benefit Plans - Estimated Future Benefit Payments (Detail) $ in Millions	Sep. 30, 2022 USD ($)
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2028 - 2032	$ 1
Pension Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2023	8
2024	10
2025	9
2026	9
2027	10
2028 - 2032	47
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2023	2
2024	2
2025	2
2026	2
2027	2
2028 - 2032	6
Postretirement Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
2023	1
2024	1
2025	1
2026	1
2027	1
2028 - 2032	$ 4

Employee Benefit Plans - Net Pe

Employee Benefit Plans - Net Periodic Defined Benefit Pension and Other Postretirement Benefit Costs (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost			$ 1
Interest cost			4
Expected return on plan assets			$ (3)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]			Other income (expense)
Settlements or Curtailments cost		$ 4	$ 3
Net periodic (benefit) cost		4	5
Pension Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 4	6	5
Interest cost	4	3	3
Expected return on plan assets	$ (6)	$ (10)	$ (9)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (expense)	Other income (expense)	Other income (expense)
Amortization of net losses	$ 1	$ 3	$ 3
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (expense)	Other income (expense)	Other income (expense)
Settlements or Curtailments cost		$ 1	$ 1
Other		2
Net periodic (benefit) cost	$ 3	5	3
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost			1
Amortization of net losses			$ (1)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]			Other income (expense)
Settlements or Curtailments cost	(1)
Net periodic (benefit) cost	(1)
Postretirement Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	1	1
Amortization of net losses			$ 1
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Amortization of Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]			Other income (expense)
Net periodic (benefit) cost	$ 1	$ 1	$ 1

Employee Benefit Plans - Other

Employee Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss), Pre-Tax (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Pension Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses		$ (2)	$ (4)
(Loss) gain on settlements		$ (4)	$ (3)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (expense)	Other income (expense)
Net changes recognized in Total other comprehensive (income) loss		$ (6)	$ (7)
Pension Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses	$ (2)	(15)	8
Prior service (credit) cost		(1)
Amortization of prior unrecognized loss	(1)	(3)	(3)
Loss on divestiture	(2)
(Loss) gain on settlements		$ (1)	$ (1)
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Other income (expense)	Other income (expense)
Net changes recognized in Total other comprehensive (income) loss	(5)	$ (20)	$ 4
Postretirement Benefits [Member] | U.S. Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses	(4)		1
Amortization of prior unrecognized loss			1
(Loss) gain on settlements	$ 1
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Settlement Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other income (expense)
Net changes recognized in Total other comprehensive (income) loss	$ (3)		2
Postretirement Benefits [Member] | Foreign Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net (gains) losses	(4)	(2)	(1)
Amortization of prior unrecognized loss			(1)
Net changes recognized in Total other comprehensive (income) loss	$ (4)	$ (2)	$ (2)

Employee Benefit Plans - Othe_2

Employee Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss), Pre-Tax (Parenthetical) (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, pension and other postretirement tax benefit (provision)	$ 3	$ 8
Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Other Comprehensive (Income) Loss, pension and other postretirement tax benefit (provision)			$ (1)

Employee Benefit Plans - Define

Employee Benefit Plans - Defined Benefit Pension Plans Weighted-Average Asset Allocations (Detail) - Foreign Plans [Member]	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Equity securities	20%	21%
Debt securities	68%	73%
Real estate	7%	2%
Cash and other securities	5%	4%
Total	100%	100%

Employee Benefit Plans - Fair V

Employee Benefit Plans - Fair Value of Pension Plan Assets by Asset Category (Detail) - USD ($) $ in Millions		Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		$ 135	$ 217
Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		9	11
Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		120	201
Other Investment Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1
Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		5	5
Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		10	11
Fair Value, Inputs, Level 1 | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		8	10
Fair Value, Inputs, Level 1 | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1	1
Significant Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		125	206
Significant Observable Inputs (Level 2) [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1	1
Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		119	200
Significant Observable Inputs (Level 2) [Member] | Other Investment Funds
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1
Significant Observable Inputs (Level 2) [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		5	5
Cash and Cash Equivalent Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1
Cash and Cash Equivalent Funds [Member] | Fair Value, Inputs, Level 1
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1
Non-U.S. Equities [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		4	4
Non-U.S. Equities [Member] | Fair Value, Inputs, Level 1 | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		4	4
Equity Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	[1]	23	42
Equity Funds [Member] | Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	[1]	23	42
Non-U.S. Government Bonds [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1	2
Non-U.S. Government Bonds [Member] | Fair Value, Inputs, Level 1 | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1	2
Fixed Income Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	[2]	86	155
Fixed Income Funds [Member] | Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	[2]	86	155
Non-U.S. Corporate Bonds [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		2	3
Non-U.S. Corporate Bonds [Member] | Fair Value, Inputs, Level 1 | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		2	3
Real Estate [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	[3]	9	3
Real Estate [Member] | Significant Observable Inputs (Level 2) [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	[3]	9	3
Mortgage Backed Securities [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1	1
Mortgage Backed Securities [Member] | Significant Observable Inputs (Level 2) [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1	1
Other Fixed Income [Member] | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1	1
Other Fixed Income [Member] | Fair Value, Inputs, Level 1 | Total Direct Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1	1
Cash Equivalent Funds [Member] | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1	1
Cash Equivalent Funds [Member] | Fair Value, Inputs, Level 1 | Total Investment Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets		1	1
Insurance Contracts [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	[4]	5	5
Insurance Contracts [Member] | Significant Observable Inputs (Level 2) [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Total pension plan assets	[4]	$ 5	$ 5
[1]The equity funds asset class includes funds that invest in U.S. equities as well as equity securities issued by companies incorporated, listed or domiciled in countries in developed and/or emerging markets. These companies may be in the small-, mid- or large-cap categories.[2]The fixed income funds asset class includes investments in high quality funds. High quality fixed income funds primarily invest in low risk U.S. and non-U.S. government securities, investment-grade corporate bonds, mortgages and asset-backed securities. A significant portion of the fixed income funds include investment in long-term bond funds.[3]The real estate funds asset class includes funds that primarily invest in entities which are principally engaged in the ownership, acquisition, development, financing, sale and/or management of income-producing real estate properties, both commercial and residential. These funds typically seek long-term growth of capital and current income that is above average relative to public equity funds.[4]Insurance contracts held by the Company’s non-U.S. plans are issued by well-known, highly rated insurance companies.

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Mar. 11, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of vesting in first anniversary	30%
Percentage of vesting in second anniversary	30%
Percentage of vesting in third anniversary	40%
Net stock-based compensation expense	$ 22	$ 20	$ 9
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of exercise price equal to market price on the date of grant	100%
Vesting period (in years)	3 years
Expiration period, years	10 years
Unrecognized compensation cost	$ 3
Weighted-average period, years	1 year
Options outstanding, aggregate intrinsic value	$ 22
Options exercisable, aggregate intrinsic value	22
Intrinsic value of options exercised	4	2
Cash received from exercises	$ 6	$ 5	$ 1
Stock Options, Weighted Average Grant Date Fair Value, Granted	$ 15.95	$ 9.69	$ 10.68
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period (in years)	3 years
Unrecognized compensation cost	$ 24
Weighted-average period, years	1 year
Estimated weighted average grant date fair value	$ 58.72	$ 41.92	$ 49.36
Intrinsic value of restricted stock units vested	$ 13	$ 8	$ 13
Restricted Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period (in years)	3 years
2017 Long-Term Incentive Plan [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock, authorized shares				8,625,000
Supplemental 401(k) Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Supplemental retirement savings plan, aggregate value of the accounts, shares	103,000	77,000

Stock-Based Compensation - Stoc

Stock-Based Compensation - Stock-Based Compensation Expenses (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before tax	$ 23	$ 21	$ 9
Income tax benefit	(1)	(1)
Net stock-based compensation expense	22	20	9
Cost of Sales [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before tax	3	2	1
Selling and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before tax	18	17	7
Research and Technical Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before tax	$ 2	$ 2	$ 1

Stock-Based Compensation - Equi

Stock-Based Compensation - Equity Incentive Plan Activity (Detail) - $ / shares shares in Thousands		12 Months Ended
		Sep. 30, 2022		Sep. 30, 2021	Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options, Total Options, Outstanding at September 30, 2021	[1]	1,476
Stock Options, Total Options, Granted	[1]	242
Stock Options, Total Options, Exercised / Vested	[1]	(136)
Stock Options, Total Options, Cancelled / Forfeited	[1]	(8)
Stock Options, Total Options, Outstanding at September 30, 2022	[1]	1,574	[2]	1,476
Stock Options, Total Options, Exercisable at September 30, 2022	[1]	923
Stock Options, Weighted Average Exercise Price, Outstanding at September 30, 2021		$ 48.36
Stock Options, Weighted Average Exercise Price, Granted		58.27
Stock Options, Weighted Average Exercise Price, Exercised / Vested		47.52
Stock Options, Weighted Average Exercise Price, Cancelled / Forfeited		62.24
Stock Options, Weighted Average Exercise Price, Outstanding at September 30, 2022		49.89	[2]	$ 48.36
Stock Options, Weighted Average Exercise Price, Exercisable at September 30, 2022		$ 50.31
Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted Stock / Units, Outstanding at September 30, 2021	[3]	859
Restricted Stock / Units, Granted	[3]	280
Restricted Stock / Units, Performance-based adjustment	[3],[4]	122
Restricted Stock / Units, Exercised / Vested	[3]	(213)
Restricted Stock / Units, Cancelled / Forfeited	[3]	(36)
Restricted Stock / Units, Outstanding at September 30, 2022	[3]	1,012	[2]	859
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Outstanding at September 30, 2021		$ 45.82
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Granted		58.72		$ 41.92	$ 49.36
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Performance-based adjustment	[4]	48.66
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Exercised / Vested		49.35
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Cancelled / Forfeited		46.85
Restricted Stock / Units, Weighted Average Grant Date Fair Value, Outstanding at September 30, 2022		$ 48.95	[2]	$ 45.82
[1]Unvested stock options were approximately 651,000 49.30 6.81

Stock-Based Compensation - Eq_2

Stock-Based Compensation - Equity Incentive Plan Activity (Parenthetical) (Detail) - $ / shares shares in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock options outstanding include options vested and expected to vest in the future, weighted average remaining contractual life, in years	6 years 9 months 21 days
Unvested stock options	651,000	745,000
Unvested stock options, weighted average grant date fair value	$ 49.30	$ 45.24

Stock-Based Compensation - Weig

Stock-Based Compensation - Weighted-Average Assumptions (Detail) - $ / shares	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected stock price volatility	35%	36%	28%
Risk free interest rate	1.40%	0.60%	1.90%
Expected life of options (years)	6 years	6 years	6 years
Expected annual dividends per year	$ 1.40	$ 1.40	$ 1.40

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) - Changes in Each Component of AOCI, Net of Tax (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 1,090	$ 814
Ending Balance	1,032	1,090
Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(265)	(307)
Other comprehensive income (loss) before reclassifications	(208)	52
Amounts reclassified from AOCI	29	(3)
Less: Other comprehensive income (loss) attributable to noncontrolling interests	(15)	7
Ending Balance	(429)	(265)
Pension and Other Postretirement Benefit Liability Adjustment [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(24)	(44)
Other comprehensive income (loss) before reclassifications	12	20
Amounts reclassified from AOCI	2
Ending Balance	(10)	(24)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(289)	(351)
Other comprehensive income (loss) before reclassifications	(196)	72
Amounts reclassified from AOCI	31	(3)
Less: Other comprehensive income (loss) attributable to noncontrolling interests	(15)	7
Ending Balance	$ (439)	$ (289)

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) - Amounts Reclassified Out of AOCI (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
(Gains) Losses Reclassified to Interest Expense [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ (6)	$ (5)	$ (5)
(Gains) Losses Excluded from Effectiveness Testing and Amortized to Interest Expense [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	2	2	2
Currency Translation Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	33
Amortization of Actuarial Losses and Prior Service Cost (Credit) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	1	3	3
Release of Actuarial Losses and Prior Service Cost (Credit) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	2
Settlement and Curtailment Loss (Gain)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(1)	5	4
Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ 31	$ 5	$ 4

Earnings Per Share - Components

Earnings Per Share - Components of Basic and Diluted Earnings Per Common Share (EPS) (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Basic EPS:
Net income (loss) attributable to Cabot Corporation	$ 209	$ 250	$ (238)
Less: Dividends and dividend equivalents to participating securities	1	1
Less: Undistributed earnings allocated to participating securities	2	2
Earnings (loss) allocated to common shareholders (numerator)	$ 206	$ 247	$ (238)
Weighted average common shares and participating securities outstanding	57.4	57.5	57.3
Less: Participating securities	0.9	0.8	0.7
Adjusted weighted average common shares (denominator)	56.5	56.7	56.6
Basic	$ 3.65	$ 4.35	$ (4.21)
Diluted EPS:
Earnings (loss) allocated to common shareholders	$ 206	$ 247	$ (238)
Plus: Earnings allocated to participating securities	3	3
Less: Adjusted earnings allocated to participating securities	3	3
Earnings (loss) available to common shares (numerator)	$ 206	$ 247	$ (238)
Adjusted weighted average common shares outstanding	56.5	56.7	56.6
Common shares issuable	0.4	0.1
Adjusted weighted average common shares (denominator)	56.9	56.8	56.6
Diluted	$ 3.62	$ 4.34	$ (4.21)

Earnings Per Share - Calculatio

Earnings Per Share - Calculation of Undistributed Earnings (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income (loss) attributable to Cabot Corporation	$ 209	$ 250	$ (238)
Less: Dividends declared on common stock	84	80	80
Less: Dividends and dividend equivalents to participating securities	1	1
Undistributed earnings (loss)	124	169	(318)
Undistributed earnings (loss) allocated to common shareholders	122	167	$ (318)
Undistributed earnings allocated to participating securities	$ 2	$ 2

Earnings Per Share - Componen_2

Earnings Per Share - Components of Basic and Diluted Earnings (Loss) Per Common Share (EPS) (Parenthetical) (Detail) - shares	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Antidilutive securities excluded from computation of earnings per share	214,180	525,131	1,821,018

Income Taxes - Expiration Dates

Income Taxes - Expiration Dates of NOLs, Capital Loss and Other Tax Credit Carryforwards Before Valuation Allowances (Parenthetical) (Detail)	12 Months Ended
	Sep. 30, 2022
Significant Tax Attributes And Dates Of Expiration [Line Items]
Expiration periods	2030
Minimum [Member]
Significant Tax Attributes And Dates Of Expiration [Line Items]
Expiration periods	2023
Maximum [Member]
Significant Tax Attributes And Dates Of Expiration [Line Items]
Expiration periods	2029

Income Taxes - Income Before In

Income Taxes - Income Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments [Abstract]
Domestic	$ (20)	$ (73)	$ (274)
Foreign	355	479	241
Income (loss) from continuing operations before income taxes and equity in earnings of affiliated companies	$ 335	$ 406	$ (33)

Income Taxes - Provision (Benef

Income Taxes - Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
U.S. federal and state, Current	$ 7	$ 11	$ (1)
U.S. federal and state, Deferred	2	(1)	139
U.S. federal and state, Total	9	10	138
Foreign, Current	135	103	62
Foreign, Deferred	(42)	10	(9)
Foreign, Total	93	113	53
Provision (benefit) for income taxes	$ 102	$ 123	$ 191

Income Taxes - Reconciliation U

Income Taxes - Reconciliation Using U.S. Statutory Rate (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Computed tax expense at the federal statutory rate	$ 70	$ 85	$ (7)
Foreign impact of taxation at different rates, repatriation, valuation allowance, and other	38	8	4
Global Intangible Low Taxed Income (GILTI)	23	18	(4)
Purification Solutions business divestiture	(179)
Impact of the Coronavirus Aid, Relief, and Economic Security ("CARES") Act of 2020		10	(10)
Impact of increase (decrease) in valuation allowance on U.S. deferred taxes	160	(1)	228
U.S. and state benefits from research and experimentation activities	(2)	(2)	(2)
Provision (settlement) of unrecognized tax benefits	1	1	(7)
Permanent differences, net	10	7
State taxes, net of federal effect	(19)	(3)	(11)
Provision (benefit) for income taxes	$ 102	$ 123	$ 191

Income Taxes - Components of De

Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Components Of Deferred Tax Assets [Abstract]
Deferred expenses	$ 10	$ 14
Intangible assets	39	38
Inventory	15	13
Operating lease liability	21	21
Other	32	18
U.S. federal interest expense carryforward	33	24
Pension and other benefits	29	32
Net operating loss carryforwards	224	257
Capital loss carryforwards	137
Foreign tax credit carryforwards	55	48
R&D credit carryforwards	47	46
Other business credit carryforwards	20	24
Subtotal	662	535
Valuation allowance	(580)	(470)
Total deferred tax assets	82	65
Property, plant and equipment	(59)	(47)
Right of use asset	(21)	(20)
Unremitted earnings of non-U.S. subsidiaries	(22)	(18)
Total deferred tax liabilities	$ (102)	$ (85)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Income Taxes [Line Items]
Other tax credit carryforwards		$ 122
Undistributed earnings		1,405
Unrecognized tax benefits	$ 23	159	$ 21	$ 23	$ 27
Unrecognized tax benefits, offset against deferred tax assets		16
Accruals for penalties and interest		4
Total penalties and interest		2	2	$ 1
Favorable impact on tax provision		$ 22
Earliest Tax Year [Member] | United States Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2019
Latest Tax Year [Member] | United States Internal Revenue Service (IRS) [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2021
Purification Solutions [Member]
Income Taxes [Line Items]
Income tax benefit from tax loss related to divestiture		$ 137
Other Liabilities [Member]
Income Taxes [Line Items]
Unrecognized tax benefits, recorded		6
Non-U.S. Jurisdictions [Member]
Income Taxes [Line Items]
NOLs		$ 20
Non-U.S. Jurisdictions [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2005
Non-U.S. Jurisdictions [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2021
Non-U.S. Jurisdictions [Member] | Maximum [Member]
Income Taxes [Line Items]
Other tax credit carryforwards		$ 1
State Tax Authorities [Member] | Earliest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2009
State Tax Authorities [Member] | Latest Tax Year [Member]
Income Taxes [Line Items]
Tax years remain subject to examination		2021
U.S. Defined Benefit Plans [Member]
Income Taxes [Line Items]
Deferred tax assets, valuation allowance charge	$ 228
Increased/(decreased) valuation allowance		$ 110	$ (11)

Income Taxes - Expiration Dat_2

Income Taxes - Expiration Dates of NOLs, Capital Loss and Other Tax Credit Carryforwards Before Valuation Allowances (Detail) $ in Millions	Sep. 30, 2022 USD ($)
Significant Tax Attributes And Dates Of Expiration [Line Items]
NOLs/Capital Losses	$ 2,092
Credits	122
2022 - 2028 [Member]
Significant Tax Attributes And Dates Of Expiration [Line Items]
NOLs/Capital Losses	1,142
Credits	26
2029 and Thereafter [Member]
Significant Tax Attributes And Dates Of Expiration [Line Items]
NOLs/Capital Losses	227
Credits	94
Indefinite Carryforwards [Member]
Significant Tax Attributes And Dates Of Expiration [Line Items]
NOLs/Capital Losses	723
Credits	$ 2

Income Taxes - Reconciliation o

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Balance at beginning of the year	$ 21	$ 23	$ 27
Additions based on tax positions related to the current year	138	1	2
Additions for tax positions of prior years	2		2
Reductions of tax positions of prior years	(1)	(2)	(1)
Reductions related to settlements			(5)
Reductions from lapse of statute of limitations	(1)	(1)	(2)
Balance at end of the year	$ 159	$ 21	$ 23

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Lessee Lease Description [Line Items]
Short term lease costs	$ 5	$ 5	$ 6
Variable lease cost	$ 1	$ 1	$ 1
Minimum [Member]
Lessee Lease Description [Line Items]
Lease term	1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Lease term	17 years
Lease extension period	15 years
Maximum [Member] | Land [Member]
Lessee Lease Description [Line Items]
Lease term	79 years

Leases - Components of Company'

Leases - Components of Company's Lease Costs (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease cost	$ 23	$ 25	$ 32
Finance lease cost	6	7	6
Total lease cost	$ 29	$ 32	$ 38

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information Related to Company's Leases (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 17	$ 20	$ 25
Operating cash flows from finance leases	2	2	2
Financing cash flows from finance leases	4	3	3
Right-of-use assets obtained in exchange for new operating lease liabilities	14	6	14
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 1	$ 4	$ 24

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information Related to Company's Leases (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Lease ROU assets:
Operating	$ 96	$ 90
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Finance	$ 41	$ 44
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Net property, plant and equipment	Net property, plant and equipment
Total lease ROU assets	$ 137	$ 134
Lease liabilities:
Operating	$ 14	$ 14
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts payable and accrued liabilities	Accounts payable and accrued liabilities
Finance	$ 3	$ 4
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current portion of long-term debt	Current portion of long-term debt
Operating	$ 83	$ 84
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Finance	$ 26	$ 29
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt
Total lease liabilities	$ 126	$ 131

Leases - Weighed Average Remain

Leases - Weighed Average Remaining Lease Term and Discount Rates (Detail)	Sep. 30, 2022	Sep. 30, 2021
Lease Cost [Abstract]
Operating leases	15 years	17 years
Finance leases	10 years	11 years
Operating leases	2.97%	2.41%
Finance leases	5.40%	5.76%

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments Under Non-cancelable Operating and Finance Leases (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Sep. 30, 2021
Operating leases
2023	$ 16
2024	14
2025	13
2026	11
2027	10
2028 and thereafter	51
Total lease payments	115
Less: imputed interest	18
Total	$ 97
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accounts payable and accrued liabilities
Finance leases
2023	$ 5
2024	4
2025	4
2026	4
2027	3
2028 and thereafter	16
Total lease payments	36
Less: imputed interest	7
Total	$ 29	$ 33

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Loss Contingencies [Line Items]
Raw material purchased	$ 512,000,000	$ 405,000,000	$ 258,000,000
Long term purchase commitment related to information technology	$ 26,000,000
Purchase agreement period	5 years
Charges for environmental expense	$ 1,000,000		$ 1,000,000
Environmental Remediation Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of sales	Cost of sales	Cost of sales
Settlement amount	$ 11,000,000	$ 37,000,000	$ 37,000,000
(Provision) benefit for income taxes	(102,000,000)	(123,000,000)	(191,000,000)
Respirator Liabilities [Member]
Loss Contingencies [Line Items]
Respirator reserve	$ 39,000,000	44,000,000
Respirator reserve period	10 years
Respirator Liabilities [Member] | Selling and Administrative Expenses [Member]
Loss Contingencies [Line Items]
Respirator charge	$ 6,000,000
Brazil Indirect Tax Settlements
Loss Contingencies [Line Items]
(Provision) benefit for income taxes		12,000,000
Brazil Indirect Tax Settlements | Net Sales And Other Operating Revenues
Loss Contingencies [Line Items]
Income tax credit recovery		9,000,000
Brazil Indirect Tax Settlements | Other Nonoperating Income (Expense) [Member]
Loss Contingencies [Line Items]
Estimated charge for damages		3,000,000
Environmental Matters [Member]
Loss Contingencies [Line Items]
Reserved for environmental matters	4,000,000	5,000,000
Reserve for environmental matters included in accrued expenses	$ 1,000,000	$ 1,000,000
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration]	Accounts payable and accrued liabilities	Accounts payable and accrued liabilities
Reserve for environmental matters included in other liabilities	$ 3,000,000	$ 4,000,000
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Cash payments for environmental reserves	$ 2,000,000	$ 2,000,000	7,000,000
Environmental Matters [Member] | Operating and Maintenance Component [Member]
Loss Contingencies [Line Items]
Reserved for environmental matters	3,000,000	4,000,000
Per Accident for Auto [Member]
Loss Contingencies [Line Items]
Self-insured liability	500,000
Per Occurrence for All Other [Member]
Loss Contingencies [Line Items]
Self-insured liability	2,000,000
Per Accident for U.S. Workers' Compensation [Member]
Loss Contingencies [Line Items]
Self-insured liability	1,000,000
Maximum [Member]
Loss Contingencies [Line Items]
Retention for medical costs per person per annum	275,000
Charges for environmental expense		1,000,000
Charges related to value added tax matters	41,000,000
Non-Controlling Interests [Member]
Loss Contingencies [Line Items]
Raw material purchased	235,000,000	135,000,000	$ 81,000,000
Accounts payable and accrued liabilities	$ 31,000,000	$ 14,000,000

Commitments and Contingencies_2

Commitments and Contingencies - Schedule of Components of Purchase Commitments (Detail) $ in Millions	Sep. 30, 2022 USD ($)
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2023	$ 294
Payments Due by Fiscal Year 2024	244
Payments Due by Fiscal Year 2025	237
Payments Due by Fiscal Year 2026	236
Payments Due by Fiscal Year 2027	221
Payments Due Thereafter	1,960
Payments Due, Total	3,192
Reinforcement Materials [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2023	251
Payments Due by Fiscal Year 2024	202
Payments Due by Fiscal Year 2025	201
Payments Due by Fiscal Year 2026	201
Payments Due by Fiscal Year 2027	186
Payments Due Thereafter	1,727
Payments Due, Total	2,768
Performance Chemicals [Member]
Long-term Purchase Commitment [Line Items]
Payments Due by Fiscal Year 2023	43
Payments Due by Fiscal Year 2024	42
Payments Due by Fiscal Year 2025	36
Payments Due by Fiscal Year 2026	35
Payments Due by Fiscal Year 2027	35
Payments Due Thereafter	233
Payments Due, Total	$ 424

Financial Information by Segm_3

Financial Information by Segment & Geographic Area - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2022 Segment Business_Unit
Segment Reporting Information [Line Items]
Number of business reportable segments | Segment	2
Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Number of business activity | Business_Unit	2

Financial Information by Segm_4

Financial Information by Segment & Geographic Area - Schedule of Performance Segment (Detail) - Performance Chemicals [Member] - Operating Segments [Member] - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales	$ 1,372	$ 1,148	$ 933
Performance Additives [Member]
Segment Reporting Information [Line Items]
Net sales	1,013	796	645
Formulated Solutions [Member]
Segment Reporting Information [Line Items]
Net sales	$ 359	$ 352	$ 288

Financial Information by Segm_5

Financial Information by Segment & Geographic Area - Financial Information by Reportable Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,321	$ 3,409	$ 2,614
Depreciation and amortization	146	160	158
Equity in earnings of affiliated companies	10	3	3
Income (loss) from continuing operations before income taxes	335	406	(33)
Assets	3,525	3,306	2,781
Total expenditures for additions to long-lived assets	221	198	169
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	4,044	3,186	2,442
Depreciation and amortization	145	159	156
Equity in earnings of affiliated companies	10	4	4
Income (loss) from continuing operations before income taxes	642	550	283
Assets	3,149	3,029	2,518
Total expenditures for additions to long-lived assets	217	193	166
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	277	223	172
Depreciation and amortization	1	1	2
Equity in earnings of affiliated companies		(1)	(1)
Income (loss) from continuing operations before income taxes	(307)	(144)	(316)
Assets	376	277	263
Total expenditures for additions to long-lived assets	4	5	3
Reinforcement Materials [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	2,575	1,781	1,256
Depreciation and amortization	70	70	68
Equity in earnings of affiliated companies	4
Income (loss) from continuing operations before income taxes	408	329	162
Assets	1,691	1,421	1,077
Total expenditures for additions to long-lived assets	114	104	66
Performance Chemicals [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	1,372	1,148	933
Depreciation and amortization	72	73	64
Equity in earnings of affiliated companies	5	2	1
Income (loss) from continuing operations before income taxes	234	211	118
Assets	1,458	1,325	1,145
Total expenditures for additions to long-lived assets	100	80	92
Purification Solutions [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	97	257	253
Depreciation and amortization	3	16	24
Equity in earnings of affiliated companies	1	2	3
Income (loss) from continuing operations before income taxes		10	3
Assets		283	296
Total expenditures for additions to long-lived assets	$ 3	$ 9	$ 8

Financial Information by Segm_6

Financial Information by Segment & Geographic Area - Sales of Equity Method Affiliate, Discounting Charges for Certain Notes Receivable, by- productive Revenue, Indirect Tax Settlement Credits, and Insurance Recoveries (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues from external customers	$ 4,321	$ 3,409	$ 2,614
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	277	223	172
Unallocated and Other [Member] | Shipping and Handling Costs [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	162	153	113
Unallocated and Other [Member] | By-product Sales [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	122	73	62
Unallocated and Other [Member] | Other [Member]
Segment Reporting Information [Line Items]
Revenues from external customers	$ (7)	$ (3)	$ (3)

Financial Information by Segm_7

Financial Information by Segment & Geographic Area - 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	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Interest expense	$ (56)	$ (49)	$ (53)
Gain on bargain purchase of a business	24
Gain on sale of land	17
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Interest expense	(56)	(49)	(53)
Unallocated corporate costs	(59)	(58)	(41)
General unallocated income (expense)	1		(1)
Less: Equity in earnings of affiliated companies, net of tax	10	3	3
Income from continuing operations before income taxes and equity in earnings of affiliated companies	(307)	(144)	(316)
Certain Items [Member]
Segment Reporting Information [Line Items]
Gain on bargain purchase of a business	24
Gain on sale of land	17
Employee benefit plan settlement and other charges	1	(4)	(10)
Loss on sale and asset impairment charge	(207)
Legal and environmental matters and reserves	(9)	(25)	(54)
Acquisition and integration-related charges	(6)	(5)	(5)
Global restructuring activities	(3)	(11)	(19)
Inventory reserve adjustment			(2)
Indirect tax settlement credits		12	3
Other certain items		(1)	(1)
Total certain items, pre-tax	(183)	$ (34)	(218)
Certain Items [Member] | Marshall Mine [Member]
Segment Reporting Information [Line Items]
Loss on sale and asset impairment charge			(129)
Certain Items [Member] | Specialty Fluids [Member]
Segment Reporting Information [Line Items]
Divestiture related benefit	5
Loss on sale and asset impairment charge			$ (1)
Certain Items [Member] | Purification Solutions [Member]
Segment Reporting Information [Line Items]
Divestiture related charges	$ (5)

Financial Information by Segm_8

Financial Information by Segment & Geographic Area - Revenue from External Customers and Property, Plant and Equipment Information by Geographic Area (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers	$ 4,321	$ 3,409	$ 2,614
Net property, plant and equipment	1,270	1,376
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers	842	668	581
Net property, plant and equipment	524	513
China [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers	1,129	858	598
Net property, plant and equipment	333	333
Other Countries [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenues from external customers	2,350	1,883	$ 1,435
Net property, plant and equipment	$ 413	$ 530

Financial Information by Segm_9

Financial Information by Segment & Geographic Area - Revenue from External Customers by Geographic Region (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net sales and other operating revenues	$ 4,321	$ 3,409	$ 2,614
Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	4,044	3,186	2,442
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	277	223	172
Reinforcement Materials [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	2,575	1,781	1,256
Performance Chemicals [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	1,372	1,148	933
Purification Solutions [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	97	257	253
Americas [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	1,517	1,119	868
Americas [Member] | Reinforcement Materials [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	1,057	699	490
Americas [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	417	310	266
Americas [Member] | Purification Solutions [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	43	110	112
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	1,586	1,264	931
Asia Pacific [Member] | Reinforcement Materials [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	1,009	745	529
Asia Pacific [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	563	485	368
Asia Pacific [Member] | Purification Solutions [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	14	34	34
Europe, Middle East and Africa [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	941	803	643
Europe, Middle East and Africa [Member] | Reinforcement Materials [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	509	337	237
Europe, Middle East and Africa [Member] | Performance Chemicals [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	392	353	299
Europe, Middle East and Africa [Member] | Purification Solutions [Member]
Segment Reporting Information [Line Items]
Net sales and other operating revenues	$ 40	$ 113	$ 107