Meritor (MTOR) 10-K 12 Nov 20 2020 FY Annual report Financial data

COVER PAGE

COVER PAGE - USD ($)	12 Months Ended
	Sep. 30, 2020	Nov. 11, 2020	Mar. 31, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 27, 2020
Document Transition Report	false
Entity File Number	1-15983
Entity Registrant Name	MERITOR, INC.
Entity Incorporation, State or Country Code	IN
Entity Tax Identification Number	38-3354643
Entity Address, Address Line One	2135 West Maple Road
Entity Address, City or Town	Troy,
Entity Address, State or Province	MI
Entity Address, Postal Zip Code	48084-7186
City Area Code	248
Local Phone Number	435-1000
Title of 12(b) Security	Common Stock, $1 Par Value
Trading Symbol	MTOR
Security Exchange Name	NYSE
Entity Well-Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 1,024,560,711
Entity Common Stock, Shares Outstanding		72,311,617
Documents Incorporated by Reference	Certain information contained in the definitive Proxy Statement for the Annual Meeting of Shareholders of the registrant to be held on January 28, 2021 is incorporated by reference into Part III.
Amendment Flag	false
Entity Central Index Key	0001113256
Current Fiscal Year End Date	--09-30
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020

CONSOLIDATED STATEMENT OF OPERA

CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Sales	$ 3,044	$ 4,388	$ 4,178
Cost of sales	(2,716)	(3,748)	(3,553)
GROSS MARGIN	328	640	625
Selling, general and administrative	(221)	(256)	(313)
Income from WABCO distribution termination	265	0	0
Other operating expense, net	(40)	(21)	(20)
OPERATING INCOME (LOSS)	332	363	292
Other income	46	40	26
Equity in earnings of affiliates	14	31	27
Interest expense, net	(66)	(57)	(67)
INCOME (LOSS) BEFORE INCOME TAXES	326	377	278
Benefit (provision) for income taxes	(78)	(82)	(149)
INCOME FROM CONTINUING OPERATIONS	248	295	129
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, net of tax	1	1	(3)
NET INCOME	249	296	126
Less: Net income attributable to noncontrolling interests	(4)	(5)	(9)
Net income (loss) attributable to Meritor, Inc.	245	291	117
NET INCOME ATTRIBUTABLE TO MERITOR, INC.
Net income from continuing operations	244	290	120
Income (loss) from discontinued operations	1	1	(3)
Net income	$ 245	$ 291	$ 117
BASIC EARNINGS (LOSS) PER SHARE
Continuing operations (in dollars per share)	$ 3.30	$ 3.49	$ 1.37
Discontinued operations (in dollars per share)	0.01	0.01	(0.03)
Basic earnings per share (in dollars per share)	3.31	3.50	1.34
DILUTED EARNINGS (LOSS) PER SHARE
Continuing operations (in dollars per share)	3.23	3.36	1.31
Discontinued operations (in dollars per share)	0.01	0.01	(0.03)
Diluted earnings per share (in dollars per share)	$ 3.24	$ 3.37	$ 1.28
Basic average common shares outstanding (in shares)	74	83.2	87.5
Diluted average common shares outstanding (in shares)	75.6	86.3	91.2

CONSOLIDATED STATEMENT OF COMPR

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 249	$ 296	$ 126
Other comprehensive income:
Foreign currency translation adjustments	(21)	(18)	(51)
Pension and other postretirement benefit related adjustments (net of tax of $27, $22 and $6 for the year ended September 30, 2020, 2019 and 2018, respectively	89	(96)	24
Unrealized gain (loss) on cash flow hedges	0	(2)	4
Total comprehensive income	317	180	103
Less: Comprehensive income attributable to noncontrolling interest	(5)	(4)	(7)
Comprehensive income attributable to Meritor, Inc.	$ 312	$ 176	$ 96

CONSOLIDATED STATEMENT OF COM_2

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Pension and other postretirement benefit, Tax	$ 27	$ 22	$ 6

CONSOLIDATED BALANCE SHEET

CONSOLIDATED BALANCE SHEET - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 315	$ 108
Receivables, trade and other, net	479	551
Inventories	435	526
Other current assets	54	31
TOTAL CURRENT ASSETS	1,283	1,216
NET PROPERTY	515	515
GOODWILL	501	478
OTHER ASSETS	585	606
TOTAL ASSETS	2,884	2,815
CURRENT LIABILITIES:
Short-term debt	39	41
Accounts and notes payable	423	610
Other current liabilities	264	285
TOTAL CURRENT LIABILITIES	726	936
LONG-TERM DEBT	1,188	902
RETIREMENT BENEFITS	196	336
OTHER LIABILITIES	279	226
TOTAL LIABILITIES	2,389	2,400
COMMITMENTS AND CONTINGENCIES (NOTE 22)
EQUITY:
Common stock (September 30, 2020 and 2019,103.7 and 104.1 shares issued and 72.3 and 81.4 shares outstanding, respectively	105	104
Additional paid-in capital	808	803
Retained earnings	736	491
Treasury stock, at cost (September 30, 2020 and September 30, 2019, 31.4 and 22.7 shares, respectively)	(573)	(332)
Accumulated other comprehensive loss	(614)	(681)
Total equity attributable to Meritor, Inc.	462	385
Noncontrolling interests	33	30
TOTAL EQUITY	495	415
TOTAL LIABILITIES AND EQUITY	$ 2,884	$ 2,815

CONSOLIDATED BALANCE SHEET (Par

CONSOLIDATED BALANCE SHEET (Parenthetical) - shares shares in Millions	Sep. 30, 2020	Sep. 30, 2019
Statement of Financial Position [Abstract]
Common stock issued (in shares)	103.7	104.1
Common stock outstanding (in shares)	72.3	81.4
Treasury stock, at cost (in shares)	31.4	22.7

CONSOLIDATED STATEMENT OF CASH

CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES
CASH PROVIDED BY OPERATING ACTIVITIES (see Note 25)	$ 265	$ 256	$ 251
INVESTING ACTIVITIES
Capital expenditures	(85)	(103)	(104)
Proceeds from sale of equity method investment	0	0	250
Cash paid for business acquisitions, net of cash acquired	0	(168)	(35)
Cash paid for investment in Transportation Power, Inc.	(13)	(6)	(6)
Other investing activities	9	6	6
CASH PROVIDED BY (USED FOR) INVESTING ACTIVITIES	(89)	(271)	111
FINANCING ACTIVITIES
Securitization	(8)	(38)	(43)
Proceeds from debt issuances	300	0	0
Borrowings against revolving line of credit	304	190	55
Repayments of line of credit	(304)	(190)	(55)
Term loan borrowings	0	175	0
Redemption of notes	0	(24)	(181)
Repayment of notes and term loan	(8)	0	0
Deferred issuance costs	0	(4)	0
Debt issuance costs	(5)	0	0
Other financing activities	(2)	(2)	(5)
Net change in debt	277	107	(229)
Repurchase of common stock	(241)	(96)	(100)
CASH PROVIDED BY (USED FOR) FINANCING ACTIVITIES	36	11	(329)
EFFECT OF CHANGES IN CURRENCY EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	(5)	(3)	(6)
CHANGE IN CASH AND CASH EQUIVALENTS	207	(7)	27
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	108	115	88
CASH AND CASH EQUIVALENTS AT END OF YEAR	$ 315	$ 108	$ 115

CONSOLIDATED STATEMENT OF EQUIT

CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	Total Equity Attributable to Meritor, Inc.	Non- controlling Interests
Beginning balance at Sep. 30, 2017	$ 295	$ 101	$ 765	$ 83	$ (136)	$ (545)	$ 268	$ 27
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	103			117		(21)	96	7
Vesting of restricted stock	0	1	(1)
Equity based compensation expense	20		20				20
Convertible securities with cash settlement	1		1				1
Repurchase of common stock	(100)				(100)		(100)
Non-controlling interest dividends	(2)							(2)
Other	0		2				2	(2)
Ending balance at Sep. 30, 2018	317	102	787	200	(236)	(566)	287	30
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	180			291		(115)	176	4
Vesting of restricted stock	0	2	(2)
Equity based compensation expense	18		18				18
Repurchase of common stock	(96)				(96)		(96)
Non-controlling interest dividends	(4)							(4)
Ending balance at Sep. 30, 2019	415	104	803	491	(332)	(681)	385	30
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	317			245		67	312	5
Vesting of restricted stock	0	1	(1)
Equity based compensation expense	7		7				7
Repurchase of common stock	(241)				(241)		(241)
Non-controlling interest dividends	(2)							(2)
Other	(1)		(1)				(1)
Ending balance at Sep. 30, 2020	$ 495	$ 105	$ 808	$ 736	$ (573)	$ (614)	$ 462	$ 33

BASIS OF PRESENTATION

BASIS OF PRESENTATION	12 Months Ended
	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION Meritor, Inc. (the "company" or "Meritor"), headquartered in Troy, Michigan, is a premier global supplier of a broad range of integrated systems, modules and components to original equipment manufacturers ("OEMs") and the aftermarket for the commercial vehicle, transportation and industrial sectors. The company serves commercial truck, trailer, military, bus and coach, construction and other industrial OEMs and certain aftermarkets. The Consolidated Financial Statements are those of the company and its consolidated subsidiaries. The company’s fiscal year ends on the Sunday nearest September 30. The 2020, 2019 and 2018 fiscal years ended on September 27, 2020, September 29, 2019 and September 30, 2018, respectively. All year and quarter references relate to the company’s fiscal year and fiscal quarters, unless otherwise stated. For ease of presentation, September 30 is used consistently throughout this report to represent the fiscal year end. COVID-19 Pandemic Update In March 2020, the World Health Organization declared a global health pandemic related to the outbreak of a novel coronavirus. The COVID-19 pandemic adversely affected the company's financial performance in the second, third and fourth quarters of fiscal year 2020 and could have an impact throughout fiscal year 2021. In response to the COVID-19 pandemic, government health officials have recommended and mandated precautions to mitigate the spread of the virus, including shelter-in-place orders, prohibitions on public gatherings and other similar measures. As a result, the company and certain of the company's customers and suppliers temporarily closed select manufacturing locations beginning late in the second quarter of fiscal year 2020, continuing into the third quarter of fiscal year 2020. As of May 31, 2020, all of the company's global facilities were back open and operating with limited production. Production volume levels continued to increase through the fourth quarter of fiscal year 2020. Most of the company’s salaried employees are primarily working remotely until further notice. There is uncertainty around the duration and breadth of the COVID-19 pandemic, as well as the impact it will have on the company's operations, supply chain and demand for its products. As a result, the ultimate impact on the company's business, financial condition or operating results cannot be reasonably estimated at this time.

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
SIGNIFICANT ACCOUNTING POLICIES	SIGNIFICANT ACCOUNTING POLICIES Use of Estimates The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America (GAAP) requires the use of estimates and assumptions related to the reporting of assets, liabilities, revenues, expenses and related disclosures. Actual results could differ from these estimates. Significant estimates and assumptions were used to review goodwill and other long-lived assets for impairment (see Notes 6 and 10), environmental liabilities (see Notes 13, 14 and 22), product warranty liabilities (see Note 13), long-term incentive compensation plan obligations (see Note 18), retiree medical and pension obligations (see Notes 19 and 20), income taxes (see Note 21), and contingencies, including asbestos (see Note 22). Concentration of Credit Risk In the normal course of business, the company provides credit to customers. The company limits its credit risk by performing ongoing credit evaluations of its customers and maintaining reserves for potential credit losses and through accounts receivable factoring programs. The company’s accounts receivables are generally due from medium- and heavy-duty truck OEMs, specialty vehicle manufacturers, aftermarket customers, and trailer producers. The company’s ten largest customers accounted for 69 percent, 77 percent and 75 percent of s ales in fiscal years 2020, 2019 and 2018, respectively. Sales to the company's top three customers were 50 percent, 54 percent and 52 percent of total sales in fiscal years 2020, 2019 and 2018, respectively. At September 30, 2020 and 2019, 25 percent and 26 percent of the company's trade accounts receivable were from the company's three largest customers. Consolidation and Joint Ventures The Consolidated Financial Statements include the accounts of the company and those subsidiaries in which the company has control. All intercompany balances and transactions are eliminated in consolidation. The results of operations of controlled subsidiaries are included in the Consolidated Financial Statements and are offset by a related noncontrolling interest recorded for the noncontrolling partners’ ownership. Investments in affiliates that are not controlled are reported using the equity method of accounting (see Note 12). Foreign Currency Local currencies are generally considered the functional currencies for operations outside the U.S. For operations reporting in local currencies, assets and liabilities are translated at year-end exchange rates with cumulative currency translation adjustments included as a component of Accumulated Other Comprehensive Loss in the Consolidated Balance Sheet. Income and expense items are translated at average rates of exchange during the year. Impairment of Long-Lived Assets Long-lived assets, excluding goodwill, to be held and used are reviewed for impairment whenever adverse events or changes in circumstances indicate a possible impairment. An impairment loss is recognized when a long-lived asset group is not recoverable, based on undiscounted cash flows over the remaining useful life of the primary asset of the group, and the long lived asset group's carrying value exceeds the fair value. Long-lived assets held for sale are recorded at the lower of their carrying amount or estimated fair value less cost to sell. Allowance for Doubtful Accounts An allowance for uncollectible trade receivables is recorded when accounts are deemed uncollectible based on consideration of write-off history, aging analysis, and any specific, known troubled accounts. Earnings per Share Basic earnings (loss) per share is calculated using the weighted average number of shares outstanding during each period. The diluted earnings (loss) per share calculation includes the impact of restricted shares, restricted share units, performance share units, and convertible securities, if applicable. A reconciliation of basic average common shares outstanding to diluted average common shares outstanding is as follows (in millions): Year Ended September 30, 2020 2019 2018 Basic average common shares outstanding 74.0 83.2 87.5 Impact of restricted shares, restricted share units and performance share units 0.8 2.2 2.8 Impact of convertible notes 0.8 0.9 0.9 Diluted average common shares outstanding 75.6 86.3 91.2 In November 2019, the Board of Directors approved a grant of performance share units to all executives eligible to participate in the long-term incentive plan. Each performance share unit represents the right to receive one share of common stock or its cash equivalent upon achievement of certain performance and time vesting criteria. The fair value of each performance share unit was $25.25, which was the company’s share price on the grant date of December 1, 2019. The Board of Directors also approved a grant of 0.3 million restricted share units to these executives. The restricted share units vest at the earlier of three years from the date of grant or upon termination of employment with the company under certain circumstances. The fair value of each restricted share unit was $25.25, which was the company's share price on the grant date of December 1, 2019. The actual number of performance share units that will vest depends upon the company’s performance relative to the established performance metrics for the three-year performance period of October 1, 2019 to September 30, 2022, measured at the end of the performance period. The number of performance share units that vest will depend on adjusted EBITDA margin, new business wins, free cash flow conversion and adjusted diluted earnings per share from continuing operations, each of which is weighted at 25%. The number of performance share units that vest will be between 0% and 200% of the grant date amount of 0.4 million performance share units. In November 2018, the Board of Directors approved a grant of performance share units to all executives eligible to participate in the company's long-term incentive plan. Each performance share unit represents the right to receive one share of common stock or its cash equivalent upon achievement of certain performance and time vesting criteria. The fair value of each performance share unit was $16.50, which was the company’s share price on the grant date of December 1, 2018. The Board of Directors also approved a grant of 0.4 million restricted share units to these executives. The restricted share units vest at the earlier of three years from the date of grant or upon termination of employment with the company under certain circumstances. The fair value of each restricted share unit was $16.50, which was the company's share price on the grant date of December 1, 2018. The actual number of performance share units that will vest depends upon the company’s performance relative to the established performance metrics for the three-year performance period of October 1, 2018 to September 30, 2021, measured at the end of the performance period. The number of performance share units that vest will depend on adjusted EBITDA margin and adjusted diluted earnings per share from continuing operations at the following weights: 50% associated with achieving an adjusted EBITDA margin target and 50% associated with achieving an adjusted diluted earnings per share from continuing operations target. The number of performance share units that vest will be between 0% and 200% of the grant date amount of 0.5 million performance share units. In November 2017, the Board of Directors approved a grant of performance share units to all executives eligible to participate in the long-term incentive plan. Each performance share unit represents the right to receive one share of common stock or its cash equivalent upon achievement of certain performance and time vesting criteria. The fair value of each performance share unit was $24.79, which was the company’s share price on the grant date of December 1, 2017. The Board of Directors also approved a grant of 0.3 million restricted share units to these executives. The restricted share units vest at the earlier of three years from the date of grant or upon termination of employment with the company under certain circumstances. The fair value of each restricted share unit was $24.79, which was the company's share price on the grant date of December 1, 2017. The actual number of performance share units that vested depended upon the company’s performance relative to the established goals for the three-year performance period of October 1, 2017 to September 30, 2020, which was measured at the end of the performance period. Other Other significant accounting policies are included in the related notes, specifically, goodwill (Note 6), inventories (Note 9), property and depreciation (Note 10), product warranties (Note 13), financial instruments (Note 16), equity based compensation (Note 18), retirement medical plans (Note 19), retirement pension plans (Note 20), income taxes (Note 21) and environmental and asbestos-related liabilities (Note 22). Accounting standards implemented during fiscal year 2020 On October 1, 2019, the company implemented Accounting Standards Update ("ASU") 2016-02, Leases (Topic 842). The company elected the practical expedient package, which allowed the company to not reassess whether existing contracts contain a lease and to not reassess classification of existing leases. The company also adopted ASU 2018-11, Leases (Topic 842) Targeted Improvements, electing to not separate lease and non-lease components in contracts that contain both and electing to not restate comparative periods when adopting ASU 2016-02. As a result, the company recognized a right-of-use asset and lease liability as a lessee for substantially all existing operating leases and has included new and expanded disclosures (Note 4). Accounting standards to be implemented The following represent the standards that may result in a significant change in practice and/or have a significant financial impact on the company. In June 2016, the Financial Accounting Standards Board ("FASB") issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments, including accounts receivable. The ASU also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The company expects to adopt this guidance in the first quarter of fiscal year 2021. The guidance is expected to have an impact on the company's accounting policies and procedures related to calculation of allowance for doubtful accounts receivable but is not expected to have a material impact on its Consolidated Financial Statements. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this ASU add, modify, and eliminate certain disclosure requirements on fair value measurements in Topic 820. The amendments in this update are effective for all entities for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Certain amendments should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. Others should be applied retrospectively. The company expects to adopt this guidance in the first quarter of fiscal year 2021. The company is currently evaluating the potential impact of this guidance on its accounting policies and its Consolidated Financial Statements. In August 2020, the FASB issued ASU 2020-06, Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (Subtopic 815-40). The ASU simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. ASC 470-20 outlines five models to allocate the proceeds attributable to the issuance of a convertible debt instrument. This ASU removes from U.S. GAAP the separation models for convertible debt with a cash conversion feature (CCF) and convertible debt with a beneficial conversion feature (BCF). As a result of adopting this ASU, entities are not required to separately present in equity an embedded conversion feature in such debt. Instead, they should account for a convertible debt instrument wholly as debt. Applying the separation models in ASC 470-20 to convertible instruments with a CCF or BCF involved the recognition of a debt discount, which is amortized to interest expense. The elimination of CCF and BCF models will reduce reported interest expense and increase reported net income for convertible instruments issued within the scope of those models before the adoption of ASU 2020-06. The amendments in this update are required to be adopted by public business entities in fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted, but no earlier than fiscal year beginning after December 15, 2020, including interim periods within those fiscal years. Entities are permitted to adopt the guidance through either a modified retrospective method of transition or a fully retrospective method of transition. The company is currently evaluating the potential impact of this guidance on its accounting policies and its Consolidated Financial Statements.

ACQUISITIONS AND DIVESTITURE

ACQUISITIONS AND DIVESTITURE	12 Months Ended
	Sep. 30, 2020
Business Combinations [Abstract]
ACQUISITIONS AND DIVESTITURE	ACQUISITIONS AND DIVESTITURE Acquisition of TransPower Business On January 16, 2020, Meritor acquired 100 percent of the voting equity interest of Transportation Power, Inc. ("TransPower") for a cash purchase price of approximately $15 million, subject to certain purchase price adjustments. Prior to the acquisition, the fair value of the company’s investment in TransPower was $12 million. The TransPower acquisition was accounted for as a business combination. With the addition of TransPower's product portfolio, Meritor advances its strategic priorities through increased investment in next-generation technologies. Pro forma financial information of the company is presented in the following table for the twelve months ended September 30, 2020 and 2019 as if the TransPower acquisition had occurred on October 1, 2018. The pro forma financial information is unaudited and is provided for informational purposes only and does not purport to be indicative of the results which would have actually been attained had the acquisition occurred on October 1, 2018 (in millions). Twelve Months Ended September 30, 2020 2019 Sales $ 3,045 $ 4,394 Net income attributable to Meritor, Inc. 244 282 The purchase price was allocated on a provisional basis as of January 16, 2020. Assets acquired and liabilities assumed were recorded at estimated fair values based on management's estimates, available information, and reasonable and supportable assumptions. Additionally, the company is utilizing a third-party to assist with certain estimates of fair values. The provisional purchase price allocation, which is subject to change and may be subsequently adjusted to reflect final valuation results and other adjustments, is shown below (in millions). The company is reviewing and may record other additional measurement period adjustments in fiscal year 2021. All goodwill resulting from the acquisition of TransPower was assigned to the Commercial Truck reportable segment (see Note 6). Estimated Fair Value As of Measurement Period Adjustments As of Purchase price $ 15 $ — $ 15 Investments in TransPower 12 — 12 $ 27 $ — $ 27 Assets acquired and liabilities assumed: Cash 2 — 2 Receivables, net 5 — 5 Inventories, net 8 — 8 PP&E 10 (1) 9 Identifiable intangible assets — 11 11 Other assets — (1) (1) Accounts payable (3) — (3) Other current liabilities (17) — (17) Total identifiable net assets acquired 5 9 14 Goodwill and other intangible assets resulting from the acquisition of TransPower 22 (9) 13 $ 27 $ — $ 27 Acquisition of AxleTech Business On July 26, 2019, the company acquired 100 percent of the voting equity interest of the AxleTech group companies for approximately $179 million in cash, subject to certain purchase price adjustments. The company funded the acquisition with the term loan under the senior secured revolving credit agreement (see Note 15). The AxleTech acquisition was accounted for as a business combination. The addition of AxleTech enhanced Meritor’s growth platform with the addition of a complementary product portfolio that includes a full line of independent suspensions, axles, braking solutions and drivetrain components across the off-highway, defense, specialty and aftermarket markets. AxleTech operates within Meritor’s Aftermarket and Industrial segment. As of September 30, 2020, the company finalized all measurement period adjustments related to the AxleTech acquisition. Since completion of initial estimates in the fourth quarter of fiscal year 2019, the company recorded a net $5 million measurement period adjustment to decrease the fair value of identifiable net assets acquired in the AxleTech transaction, resulting in a corresponding $5 million increase to goodwill. These adjustments were made to reflect additional available information and updated valuation results, which included valuation of technology and customer relationships. All goodwill resulting from the AxleTech acquisition was assigned to the Aftermarket and Industrial reportable segment (see Note 6). Recorded goodwill consists largely of the synergies and economies of scale expected from combining the operations of the company and AxleTech. The company incurred acquisition related costs of $1 million and $6 million as of September 30, 2020, and September 30, 2019, respectively, which were recorded as incurred and have been classified as either cost of sales or selling, general, and administrative expenses in the Consolidated Statement of Operations for the years ended September 30, 2020 and September 30, 2019. Estimated Fair Value As of Measurement Period Adjustments As of Purchase price $ 179 $ (2) $ 177 Assets acquired and liabilities assumed: Cash 11 — 11 Receivables, net 37 (2) 35 Inventories, net 70 (2) 68 Identifiable intangible assets 46 7 53 Other assets 9 (1) 8 PP&E 26 7 33 Accounts payable (33) 1 (32) Other liabilities (48) (17) (65) Total identifiable net assets acquired 118 (7) 111 Goodwill and other intangible assets resulting from the acquisition of AxleTech 61 5 66 $ 179 $ (2) $ 177 Acquisition of AAG Business On April 30, 2018, the company acquired substantially all of the assets of AA Gear & Manufacturing, Inc. ("AAG") for a cash purchase price of approximately $35 million and the assumption of certain liabilities. AAG provides low-to-medium volume batch manufacturing for complex gear and shaft applications, as well as quick-turnaround prototyping solutions and emergency plant support. The AAG acquisition was accounted for as a business combination. Of the $35 million, $11 million was recorded as various tangible assets acquired and liabilities assumed, $12 million was recorded related to amortizable intangibles and $12 million was recorded as goodwill. Sale of Ownership Interest in Meritor WABCO JV In the fourth quarter of fiscal year 2017, Meritor, Inc. closed on the sale of its interest in Meritor WABCO Vehicle Control Systems ("Meritor WABCO") to a subsidiary of its joint venture partner, WABCO Holdings Inc. ("WABCO"). The total purchase price for the sale was $250 million. The company remained the exclusive distributor of a certain range of WABCO's aftermarket products in the United States and Canada and the non-exclusive distributor of these products in Mexico for a period of up to 10 years following the completion of the transaction. The purchase agreement included a provision regarding certain future options of the parties to terminate the distribution arrangement at certain points during the first three and a half years after the closing at an exercise price of between $225 million and $265 million based on the earnings of the business. On September 13, 2019, the company gave notice of its intention to exercise its option to terminate the aftermarket distribution arrangement with WABCO. On March 13, 2020 the company closed on the transaction and received $265 million, from WABCO in connection with the termination of the arrangement.

LEASES

LEASES	12 Months Ended
	Sep. 30, 2020
Leases [Abstract]
LEASES	LEASES The company’s lease portfolio is comprised of leases of real estate, including manufacturing and office facilities, and leases of personal property, including machinery and other equipment and IT equipment. Operating leases with an initial term of 12 months or less are not recorded in the Consolidated Balance Sheet and related lease expense is recognized on a straight-line basis over the lease term. Short-term lease costs and variable lease costs were insignificant in the twelve months ended September 30, 2020. For all asset classes, the company has elected to adopt the practical expedient under ASC 842 to not separate lease and non-lease components in contracts that contain both. These lease agreements are accounted for as a single lease component for all classes of underlying assets. The company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. As the discount rate implicit in the lease is typically unknown, the discount rate used to determine the lease liability for the majority of our leases is the collateralized incremental borrowing rate in the applicable geographic area for a similar term and amount as the lease agreement. Components of lease expense (in millions) September 30, 2020 Finance lease costs $ 3 Operating lease costs 20 Total lease costs $ 23 The following table provides a summary of the location and amounts related to finance leases recognized in the Consolidated Balance Sheet (in millions). Classification September 30, 2020 Finance lease right-of-use assets Net Property $ 5 Finance lease liabilities Short-term debt 3 Finance lease liabilities Long-term debt 3 The following table provides a summary of the location and amounts related to operating leases recognized in the Consolidated Balance Sheet (in millions). Classification September 30, 2020 Operating lease right-of-use assets Other assets $ 70 Operating lease liabilities Other current liabilities 15 Operating lease liabilities Other liabilities 59 The following tables summarize additional information related to our lease agreements. Supplemental cash flow information related to leases (in millions) September 30, 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 19 Financing cash flows used for finance leases 2 Right-of-use assets obtained in exchange for lease obligations: Operating leases 8 Finance leases 3 Supplemental balance sheet information related to leases September 30, 2020 Weighted-average remaining lease term (years): Operating leases 8.55 Finance leases 2.21 Weighted-average discount rate: Operating leases 4.5 % Finance leases 5.0 % Maturities (in millions) Operating Leases Finance Leases 2021 17 3 2022 14 2 2023 13 1 2024 9 — Thereafter 40 — Total lease payments 93 6 Less: Impact of discounting future lease payments (19) — Present value of lease liabilities $ 74 $ 6 Disclosures related to periods prior to adoption of ASU 2016-02 Cash obligations under future minimum rental commitments under operating leases as of September 30, 2019 are shown in the table below (in millions). 2021 2022 2023 2024 2025 Thereafter Total Lease commitments $ 18 $ 15 $ 14 $ 13 $ 13 $ 25 $ 98
LEASES	LEASES The company’s lease portfolio is comprised of leases of real estate, including manufacturing and office facilities, and leases of personal property, including machinery and other equipment and IT equipment. Operating leases with an initial term of 12 months or less are not recorded in the Consolidated Balance Sheet and related lease expense is recognized on a straight-line basis over the lease term. Short-term lease costs and variable lease costs were insignificant in the twelve months ended September 30, 2020. For all asset classes, the company has elected to adopt the practical expedient under ASC 842 to not separate lease and non-lease components in contracts that contain both. These lease agreements are accounted for as a single lease component for all classes of underlying assets. The company’s lease agreements do not contain any material residual value guarantees or material restrictive covenants. As the discount rate implicit in the lease is typically unknown, the discount rate used to determine the lease liability for the majority of our leases is the collateralized incremental borrowing rate in the applicable geographic area for a similar term and amount as the lease agreement. Components of lease expense (in millions) September 30, 2020 Finance lease costs $ 3 Operating lease costs 20 Total lease costs $ 23 The following table provides a summary of the location and amounts related to finance leases recognized in the Consolidated Balance Sheet (in millions). Classification September 30, 2020 Finance lease right-of-use assets Net Property $ 5 Finance lease liabilities Short-term debt 3 Finance lease liabilities Long-term debt 3 The following table provides a summary of the location and amounts related to operating leases recognized in the Consolidated Balance Sheet (in millions). Classification September 30, 2020 Operating lease right-of-use assets Other assets $ 70 Operating lease liabilities Other current liabilities 15 Operating lease liabilities Other liabilities 59 The following tables summarize additional information related to our lease agreements. Supplemental cash flow information related to leases (in millions) September 30, 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 19 Financing cash flows used for finance leases 2 Right-of-use assets obtained in exchange for lease obligations: Operating leases 8 Finance leases 3 Supplemental balance sheet information related to leases September 30, 2020 Weighted-average remaining lease term (years): Operating leases 8.55 Finance leases 2.21 Weighted-average discount rate: Operating leases 4.5 % Finance leases 5.0 % Maturities (in millions) Operating Leases Finance Leases 2021 17 3 2022 14 2 2023 13 1 2024 9 — Thereafter 40 — Total lease payments 93 6 Less: Impact of discounting future lease payments (19) — Present value of lease liabilities $ 74 $ 6 Disclosures related to periods prior to adoption of ASU 2016-02 Cash obligations under future minimum rental commitments under operating leases as of September 30, 2019 are shown in the table below (in millions). 2021 2022 2023 2024 2025 Thereafter Total Lease commitments $ 18 $ 15 $ 14 $ 13 $ 13 $ 25 $ 98

REVENUE

REVENUE	12 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE Revenue is measured based on the consideration to which the company expects to be entitled, and is presented net of any estimates of customer sales allowances, incentives, rebates, and returns. The company recognizes revenue when it satisfies a performance obligation by transferring control over a product or service to a customer. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the company from a customer, are excluded from revenue. Shipping and handling costs associated with outbound freight after control of a product has transferred to a customer are accounted for as a fulfillment cost, as opposed to a distinct performance obligation, and are included in cost of sales. Nature of goods and services The following is a description of principal activities - separated by reportable segments - from which the company generates its revenue. The Commercial Truck segment supplies drivetrain systems and components, including axles, drivelines and braking and suspension systems, primarily for medium- and heavy-duty trucks and other applications in North America, South America, Europe and Asia Pacific. It also supplies a variety of undercarriage products and systems for trailer applications in North America. This segment also includes the company's aftermarket businesses in Asia Pacific and South America. The Aftermarket and Industrial segment supplies axles, brakes, drivelines, suspension parts and other replacement parts to commercial vehicle and industrial aftermarket customers, primarily in North America and Europe. In addition, this segment supplies drivetrain systems and certain components, including axles, drivelines, brakes and suspension systems for military, construction, bus and coach, fire and emergency and other applications in North America and Europe. Although the company may enter into long-term supply arrangements with its major customers, the prices and volumes are not fixed over the term of the arrangements and a contract does not exist under the scope of Topic 606 until prices and volumes are known. As such, individual customer releases or purchase orders represent the contract with the customer. The company accounts for individual products and services separately if they are distinct (i.e., if a product or service is separately identifiable from other items and if a customer can benefit from it on its own or with other resources that are readily available to the customer). The company has identified certain performance obligations related to brake pad fitting and axle dressing where it is acting as an agent and, therefore, recognizes revenue on a net basis for satisfaction of those performance obligations. The company recognizes revenue for the sale of goods at the point in time when the customer takes control of the goods. As such, revenue is recognized upon shipment of product and transfer of ownership to the customer. The amount of revenue recognized is based on the purchase order price and adjusted for variable consideration (i.e., customer sales allowances, incentives, rebates, and returns). Provisions for customer sales allowances, incentives, rebates, and returns are recorded as a reduction of sales at the time of revenue recognition based primarily on historical experience. The company’s payment terms with customers are customary and vary by customer and geography but typically range from 30 to 90 days. The company provides warranties on some of its products. The company records estimated product warranty costs at the time of shipment of products to customers (see Note 13 and Note 14). Disaggregation of revenue In the following tables, revenue is disaggregated for each of our reportable segments by primary geographical market for the year ended September 30, 2020 and 2019. Year Ended September 30, 2020 Primary Geographical Market Commercial Truck Aftermarket and Industrial Total U.S. $ 1,052 $ 731 $ 1,783 Canada — 54 54 Mexico 129 18 147 Total North America 1,181 803 1,984 Sweden 202 — 202 Italy 153 13 166 United Kingdom 105 9 114 Other Europe 5 134 139 Total Europe 465 156 621 Brazil 170 2 172 China 134 1 135 India 70 2 72 Other Asia-Pacific 60 — 60 Total sales $ 2,080 $ 964 $ 3,044 Year Ended September 30, 2019 (1) Primary Geographical Market Commercial Truck Aftermarket and Industrial Total U.S. $ 1,737 $ 885 $ 2,622 Canada — 69 69 Mexico 229 20 249 Total North America 1,966 974 2,940 Sweden 276 — 276 Italy 218 16 234 United Kingdom 155 10 165 Other Europe 10 81 91 Total Europe 659 107 766 Brazil 248 — 248 China 153 — 153 India 197 — 197 Other Asia-Pacific 84 — 84 Total sales $ 3,307 $ 1,081 $ 4,388 (1) Amounts for the year ended September 30, 2019 have been recast to reflect reportable segment changes. Contract balances As of September 30, 2020 and September 30, 2019, Trade receivables, net, which are included in Receivables, trade and other, net, on the Consolidated Balance Sheet, were $421 million and $517 million, respectively. For the year ended September 30, 2020, the company had no material bad-debt expense and there were no material contract assets, contract liabilities or deferred contract costs recorded on the Consolidated Balance Sheet as of September 30, 2020. Contract costs The company applies the practical expedient provided in Topic 606 and recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that the company otherwise would have recognized is one year or less. The costs which are not capitalized are included in cost of sales.

GOODWILL

GOODWILL	12 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL	GOODWILL In accordance with ASC Topic 350-20, "Intangibles – Goodwill and Other", goodwill is reviewed for impairment annually during the fourth quarter of the fiscal year or more frequently if certain indicators arise. If business conditions or other factors cause the operating results and cash flows of a reporting unit to decline, the company may be required to record impairment charges for goodwill at that time. The company tests goodwill for impairment at a level of reporting referred to as a reporting unit, which is an operating segment or one level below an operating segment (referred to as a component). A component of an operating segment is a reporting unit if the component constitutes a business for which discrete financial information is available and segment management regularly reviews the operating results of that component. When two or more components of an operating segment have similar economic characteristics, the components are aggregated and deemed a single reporting unit. An operating segment is deemed to be a reporting unit if all of its components are similar, if none of its components are a reporting unit, or if the segment comprises only a single component. Annual Impairment Analysis ASC Topic 350 allows entities to perform an initial qualitative evaluation to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount. The results of this qualitative assessment determine whether it is necessary to perform the quantitative impairment test. As allowed by the revised guidance, the company has elected to bypass the qualitative assessment for fiscal year 2020 and proceed directly to the quantitative impairment test. Excluding the qualitative evaluation discussed above, the quantitative goodwill impairment review is a comparison of the fair value of a reporting unit with its carrying amount. Estimates of fair value are primarily determined by using discounted cash flows and market multiples on earnings. If the carrying amount of a reporting unit exceeds its fair value, an impairment charge based on that difference will be recorded. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. The impairment review is highly judgmental and involves the use of significant estimates and assumptions. These estimates and assumptions have a significant impact on the amount of any impairment charge recorded. Discounted cash flow methods are dependent upon assumptions of future sales trends, market conditions and cash flows of each reporting unit over several years. Actual cash flows in the future may differ significantly from those previously forecasted. For fiscal year 2020, the fair value of all of the company’s reporting units exceeded their carrying values. Realignment of Reporting Units As discussed in Note 23, the company realigned its operations in the third quarter of fiscal year 2020, resulting in a change to its reportable segments. As a result of the change in reportable segments, the company’s reporting units changed. The Commercial Truck segment contains one reporting unit. The Aftermarket and Industrial segment contains two reporting units. See Note 3 for goodwill recorded as a result of acquisitions in fiscal year 2020. A summary of the changes in the carrying value of goodwill is presented below (in millions): Commercial Truck Aftermarket and Industrial Total Goodwill (1) $ 289 $ 147 $ 436 Accumulated impairment losses (1) — (15) (15) Balance at September 30, 2018 (1) 289 132 421 AAG measurement period adjustment (see Note 3) 3 — 3 Goodwill acquired from acquisition (see Note 3) — 61 61 Foreign currency translation (5) (2) (7) Balance at September 30, 2019 (1) 287 191 478 AxleTech measurement period adjustment (see Note 3) — 5 5 Goodwill acquired from acquisition (see Note 3) 13 — 13 Foreign currency translation 4 1 5 Balance at September 30, 2020 $ 304 $ 197 $ 501

RESTRUCTURING COSTS

RESTRUCTURING COSTS	12 Months Ended
	Sep. 30, 2020
Restructuring and Related Activities [Abstract]
RESTRUCTURING COSTS	RESTRUCTURING COSTS At September 30, 2020 and 2019, $10 million and $8 million, respectively, of restructuring reserves primarily related to unpaid employee termination benefits remained in the Consolidated Balance Sheet. The following table summarizes changes in restructuring reserves (in millions): Employee Plant Total Balance at September 30, 2017 $ 5 $ 1 $ 6 Activity during the period: Charges to continuing operations 6 — 6 Cash payments – continuing operations (7) (1) (8) Balance at September 30, 2018 4 — 4 Activity during the period: Charges to continuing operations 8 — 8 Cash payments – continuing operations (5) — (5) Other 1 — 1 Balance at September 30, 2019 8 — 8 Activity during the period: Charges to continuing operations 27 — 27 Cash payments – continuing operations (25) — (25) Total restructuring reserves, end of year 10 — 10 Less: non-current restructuring reserves — — — Restructuring reserves – current, at September 30, 2020 $ 10 $ — $ 10 Restructuring costs attributable to the company’s business segments during fiscal years 2020, 2019 and 2018 are as follows (in millions): Commercial Truck Aftermarket and Industrial Corporate Total Fiscal year 2020 Global Restructuring Program 2020 $ 7 $ 3 $ — $ 10 Global Restructuring Program 2019 11 2 — 13 AxleTech — 2 — 2 Other 1 1 — 2 Total restructuring costs $ 19 $ 8 $ — $ 27 Fiscal year 2019 (1) : Global Restructuring Program 2019 6 1 — 7 AxleTech — 3 — 3 Other (1) (1) — (2) Total restructuring costs $ 5 $ 3 $ — $ 8 Fiscal year 2018 (1) : Segment Realignment Program — 3 — 3 Other 1 1 1 3 Total restructuring costs $ 1 $ 4 $ 1 $ 6 (1) Fiscal years 2019 and 2018 have been recast to reflect reportable segment changes. Footprint Actions: On November 11, 2020, the company approved a restructuring plan to close three U.S. manufacturing plants and one European administration office in its Aftermarket and Industrial segment and consolidate their operations into existing facilities. The site closures include: • Chicago, Illinois (acquired through AxleTech acquisition) • Livermore, California (acquired through Fabco acquisition) • Livonia, Michigan (acquired through Fabco acquisition) • Zurich, Switzerland The closures impact approximately 150 hourly and salaried workers. These restructuring plans are intended to optimize the company’s manufacturing footprint, reduce costs and increase efficiencies. With this restructuring plan, the company expects to incur approximately $19 million in restructuring charges in the Aftermarket and Industrial segment, consisting of impairment of long-lived assets of $9 million, severance related costs of $5 million and other associated costs of $5 million. Restructuring actions associated with this plan are expected to be substantially complete by the end of 2021. Global Restructuring Programs: On June 2, 2020, the company approved and began executing a restructuring plan to reduce labor costs and align with current market forecasts. Under this program, the company expects to incur approximately $25 million in employee severance costs in connection with approximately 8 percent of its global salaried positions, and will eliminate certain hourly roles. During fiscal year 2020, the company incurred $10 million in restructuring costs related to this program, of which $7 million was in the Commercial Truck segment and $3 million was in the Aftermarket and Industrial segment. Restructuring actions associated with this plan are expected to be substantially complete by the end of fiscal year 2021. On September 27, 2019, the company approved and began executing a restructuring plan to reduce salaried and hourly headcount globally. This restructuring plan was intended to reduce labor costs in response to an anticipated decline in most global truck and trailer market volumes. With this restructuring plan, the company expected to incur approximately $26 million in employee severance costs in the aggregate across both of its reportable segments. During the fourth quarter of fiscal year 2019, the company incurred $6 million in restructuring costs in the Commercial Truck segment and $1 million in the Aftermarket and Industrial segment. During fiscal year 2020, the company incurred $11 million in restructuring costs in the Commercial Truck segment and $2 million in the Aftermarket and Industrial segment. Restructuring actions associated with this plan are expected to be substantially complete by the end of the first quarter of fiscal year 2021. AxleTech: On July 29, 2019, shortly after acquiring AxleTech, the company approved a restructuring plan related to the integration of the AxleTech business. This restructuring plan was intended to realize certain targeted synergies, primarily from the elimination of cost overlap. With this restructuring plan, the company expected to incur $11 million of total costs in the Aftermarket and Industrial segment with approximately $7 million related to employee severance charges and approximately $4 million related to asset impairment. During the fourth quarter of fiscal year 2019, the company recorded $3 million of severance related restructuring costs in the Aftermarket and Industrial segment. During fiscal year 2020, the company recorded $2 million of severance related restructuring costs in the Aftermarket and Industrial segment. Restructuring associated with severance actions are substantially complete as of the end of fiscal year 2020. Segment Realignment Program: On March 12, 2018, the company announced a realignment of operations to further drive long-term strategic objectives while also assigning new responsibilities as part of its commitment to leadership development. As a part of this program, the company approved various labor restructuring actions in the Aftermarket and Industrial segment. The company recorded $3 million of restructuring costs during fiscal year 2018, in connection with this program. These actions were substantially complete as of fiscal year 2018.

ACCOUNTS RECEIVABLE FACTORING A

ACCOUNTS RECEIVABLE FACTORING AND SECURITIZATION	12 Months Ended
	Sep. 30, 2020
Accounts Receivable Factoring And Securitization [Abstract]
ACCOUNTS RECEIVABLE FACTORING AND SECURITIZATION	ACCOUNTS RECEIVABLE FACTORING AND SECURITIZATION The company has a U.S. accounts receivable securitization facility with PNC Bank and participates in various accounts receivable factoring programs, primarily with Nordea Bank for trade receivables from AB Volvo as follows (in millions): Current Expiration Total Facility Size as of 9/30/20 Utilized as of 9/30/20 Utilized as of 9/30/19 EUR USD EUR USD EUR USD On-balance sheet arrangement: Committed U.S. accounts receivable securitization (1) December 2022 N/A $ 95 N/A $ 3 N/A $ 13 Total on-balance sheet arrangement: (1) N/A $ 95 N/A $ 3 N/A $ 13 Off-balance sheet arrangements: Committed Swedish factoring facility (2)(3) March 2024 € 155 $ 181 € 86 $ 100 € 109 $ 119 Committed U.S. factoring facility (2) February 2023 N/A 75 N/A 30 N/A 58 Uncommitted U.K. factoring facility February 2022 25 29 1 1 6 6 Uncommitted Italy factoring facility June 2022 30 35 8 9 21 23 Other uncommitted factoring facilities (4) None N/A N/A 12 14 18 20 Total off-balance sheet arrangements € 210 $ 320 € 107 $ 154 € 154 $ 226 (1) Availability subject to adequate eligible accounts receivable available for sale. The utilized amount includes $3 million and $4 million of letters of credit as of September 30, 2020 and September 30, 2019, respectively. (2) Actual amounts may exceed the bank's commitment at the bank's discretion. (3) The facility is backed by a 364-day liquidity commitment from Nordea Bank which extends through June 22, 2021. (4) There is no explicit facility size under the factoring agreement, but the counterparty approves the purchase of receivable tranches at its discretion. On-balance sheet arrangement U.S. Securitization Facility: As of September 30, 2019, the U.S. accounts receivables securitization facility with PNC bank had a facility size of $115 million. On April 20, 2020, the company decreased the size of the facility to $95 million. The maximum permitted priority debt-to-EBITDA ratio as of the last day of each fiscal quarter under the facility is 2.25 to 1.00. This program is provided by PNC Bank, National Association, as Administrator and Purchaser, and the other Purchasers and Purchaser Agents party to the agreement from time to time (participating lenders). Under this program, the company has the ability to sell an undivided percentage ownership interest in substantially all of its trade receivables (excluding the receivables due from AB Volvo and subsidiaries eligible for sale under the U.S. accounts receivable factoring facility) of certain U.S. subsidiaries to ArvinMeritor Receivables Corporation ("ARC"), a wholly-owned, special purpose subsidiary. ARC funds these purchases with borrowings from participating lenders under a loan agreement. This program also includes a letter of credit facility pursuant to which ARC may request the issuance of letters of credit issued for the company’s U.S. subsidiaries (originators) or their designees, which when issued will constitute a utilization of the facility for the amount of letters of credit issued. Amounts outstanding under this agreement are collateralized by eligible receivables purchased by ARC and are reported as short-term debt in the Consolidated Balance Sheet. As of September 30, 2020, there were no borrowings outstanding under this program, and $3 million was outstanding under related letters of credit. As of September 30, 2019, $9 million was outstanding under this program, and $4 million was outstanding under related letters of credit. This securitization program contains a cross-default to the revolving credit facility. At certain times during any given month, the company may sell eligible accounts receivable under this program to fund intra-month working capital needs. In such months, the company would then typically utilize the cash received from customers throughout the month to repay the borrowings under the program. Accordingly, during any given month, the company may borrow under this program in amounts exceeding the amounts shown as outstanding at fiscal year ends. Off-balance sheet arrangements Total costs associated with all of the off-balance sheet arrangements described above were $4 million, $6 million and $5 million i n fiscal years 2020, 2019 and 2018, respectively, and are included in selling, general and administrative expenses in the Consolidated Statement of Operations.

INVENTORIES

INVENTORIES	12 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
INVENTORIES	INVENTORIES Inventories are stated at the lower of cost (using FIFO or average methods) or market (determined on the basis of estimated realizable values) and are summarized as follows (in millions): September 30, 2020 2019 Finished goods $ 119 $ 153 Work in process 38 39 Raw materials, parts and supplies 278 334 Total $ 435 $ 526

NET PROPERTY

NET PROPERTY	12 Months Ended
	Sep. 30, 2020
Property, Plant and Equipment [Abstract]
NET PROPERTY	NET PROPERTY Property is stated at cost. Depreciation of property is based on estimated useful lives, generally using the straight-line method. Estimated useful lives for buildings and improvements range from 10 to 50 years and estimated useful lives for machinery and equipment range from 3 to 25 years. Significant improvements are capitalized, and disposed or replaced property is written off. Maintenance and repairs are charged to expense in the period they are incurred. Company-owned tooling is classified as property and depreciated over the shorter of its expected life or the life of the production contract, generally not to exceed three years. In accordance with the FASB guidance on property, plant and equipment, the company reviews the carrying value of long-lived assets, excluding goodwill, to be held and used, for impairment whenever events or changes in circumstances indicate a possible impairment. An impairment loss is recognized when a long-lived asset’s carrying value is not recoverable and exceeds estimated fair value. Net property is summarized as follows (in millions): September 30, 2020 2019 Property at cost: Land and land improvements $ 32 $ 31 Buildings 228 224 Machinery and equipment 1,002 935 Company-owned tooling 151 136 Construction in progress 63 74 Total 1,476 1,400 Less: Accumulated depreciation (961) (885) Net property $ 515 $ 515

OTHER ASSETS

OTHER ASSETS	12 Months Ended
	Sep. 30, 2020
Other Assets, Noncurrent [Abstract]
OTHER ASSETS	OTHER ASSETS Other assets are summarized as follows (in millions): September 30, 2020 2019 Prepaid pension costs (see Note 20) $ 179 $ 149 Deferred income tax assets (see Note 21) 30 122 Investments in non-consolidated joint ventures (see Note 12) 107 110 Other 269 225 Other assets $ 585 $ 606 The company holds a variable interest in a joint venture that is a variable interest entity ("VIE") accounted for under the equity method of accounting. The joint venture manufactures components for commercial vehicle applications primarily on behalf of the company. The variable interest relates to a supply arrangement between the company and the joint venture whereby the company supplies certain components to the joint venture on a cost-plus basis. The company is not the primary beneficiary of the joint venture, as the joint venture partner has shared or absolute control over key manufacturing operations, labor relationships, financing activities and certain other functions of the joint venture. Therefore, the company does not consolidate the joint venture. At September 30, 2020 and September 30, 2019, the company’s investment in the joint venture was $65 million and $69 million

INVESTMENTS IN NON-CONSOLIDATED

INVESTMENTS IN NON-CONSOLIDATED JOINT VENTURES	12 Months Ended
	Sep. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]
INVESTMENTS IN NON-CONSOLIDATED JOINT VENTURES	INVESTMENTS IN NON-CONSOLIDATED JOINT VENTURES The company’s non-consolidated joint ventures and related direct ownership interest are as follows: September 30, 2020 2019 2018 Master Sistemas Automotivos Ltda. 49 % 49 % 49 % Sistemas Automotrices de Mexico S.A. de C.V. 50 % 50 % 50 % Ege Fren Sanayii ve Ticaret A.S. 49 % 49 % 49 % Automotive Axles Limited 36 % 36 % 36 % The company’s investments in non-consolidated joint ventures are $107 million as of September 30, 2020 and $110 million as of September 30, 2019. The company's equity in earnings of non-consolidated joint ventures are $14 million and $31 million for the fiscal years ended September 30, 2020 and September 30, 2019, respectively. The results of the company's non-consolidated joint ventures are included in the Commercial Truck reporting segment. The summarized financial information presented below represents the combined accounts of the company’s non-consolidated joint ventures related to its continuing operations (in millions): September 30, 2020 2019 Current assets $ 308 $ 427 Non-current assets 200 211 Total assets $ 508 $ 638 Current liabilities $ 209 $ 305 Non-current liabilities 87 109 Total liabilities $ 296 $ 414 Year Ended September 30, 2020 2019 2018 Sales $ 696 $ 1,231 $ 1,101 Gross profit 76 147 154 Net income 30 63 59 Dividends received from the company’s non-consolidated joint ventures were $10 million in fiscal year 2020, $23 million in fiscal year 2019 and $17 million in fiscal year 2018. The company had sales to its non-consolidated joint ventures of approximately $9 million, $9 million and $7 million in fiscal years 2020, 2019 and 2018, respectively. These sales exclude sales of $92 million, $193 million and $196 million in fiscal years 2020, 2019 and 2018, respectively, to a joint venture in the company’s Commercial Truck segment, which are eliminated as the company purchases these components back after value add provided by the joint venture. The company had purchases from its non-consolidated joint ventures of approximately $509 million, $940 million and $843 million in fiscal years 2020, 2019 and 2018, respectively. Additionally, the company leases space and provides certain administrative and technical services to various non-consolidated joint ventures. The company collected $14 million, $12 million and $11 million for such leases and services during fiscal years 2020, 2019 and 2018, respectively. Amounts due from the company’s non-consolidated joint ventures were $23 million and $34 million at September 30, 2020 and 2019, respectively, and are included in Receivables, trade and other, net in the Consolidated Balance Sheet. Amounts due to the company’s non-consolidated joint ventures were $56 million and $80 million at September 30, 2020 and 2019, respectively, and are included in Accounts and notes payable in the Consolidated Balance Sheet. The fair value of the company’s investment in its Automotive Axles Limited joint venture was approximately $54 million and $75 million at September 30, 2020 and 2019, respectively, based on quoted market prices, as this joint venture is listed and publicly traded on the Bombay Stock Exchange in India.

OTHER CURRENT LIABILITIES

OTHER CURRENT LIABILITIES	12 Months Ended
	Sep. 30, 2020
Other Current Liabilities Disclosure [Abstract]
OTHER CURRENT LIABILITIES	OTHER CURRENT LIABILITIES Other current liabilities are summarized as follows (in millions): September 30, 2020 2019 Compensation and benefits $ 91 $ 125 Income taxes 6 24 Product warranties 19 18 Other 148 118 Other current liabilities $ 264 $ 285 The company records estimated product warranty costs at the time of shipment of products to customers. Warranty reserves are primarily based on factors that include past claims experience, sales history, product manufacturing and engineering changes and industry developments. Liabilities for product recall campaigns are recorded at the time the company’s obligation is probable and can be reasonably estimated. Policy repair actions to maintain customer relationships are recorded as other liabilities at the time an obligation is probable and can be reasonably estimated. Product warranties, including recall campaigns, not expected to be paid within one year are recorded as a non-current liability. A summary of the changes in product warranties is as follows (in millions): September 30, 2020 2019 2018 Total product warranties – beginning of year $ 50 $ 54 $ 45 Accruals for product warranties 25 23 22 Payments (19) (20) (16) Change in estimates and other (2) (7) 3 Total product warranties – end of year 54 50 54 Less: non-current product warranties (see Note 14) (35) (32) (35) Product warranties – current $ 19 $ 18 $ 19

OTHER LIABILITIES

OTHER LIABILITIES	12 Months Ended
	Sep. 30, 2020
Other Liabilities Disclosure [Abstract]
OTHER LIABILITIES	OTHER LIABILITIES Other liabilities are summarized as follows (in millions): September 30, 2020 2019 Asbestos-related liabilities (see Note 22) $ 67 $ 82 Liabilities for uncertain tax positions (see Note 21) 73 46 Product warranties (see Note 13) 35 32 Other 104 66 Other liabilities $ 279 $ 226

LONG-TERM DEBT

LONG-TERM DEBT	12 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
LONG-TERM DEBT	LONG-TERM DEBT Long-term debt, net of discounts where applicable, is summarized as follows (in millions): September 30, 2020 2019 3.25 percent convertible notes due 2037 (1)(3) $ 320 $ 319 7.875 percent convertible notes due 2026 (1)(4) 23 23 6.25 percent notes due 2025 (2)(5) 295 — Term loan due 2024 166 175 6.25 percent notes due 2024 (2)(6) 446 444 Finance lease obligation 6 7 Borrowings and securitization — 9 Unamortized discount on convertible notes (7) (29) (34) Subtotal 1,227 943 Less: current maturities (39) (41) Long-term debt $ 1,188 $ 902 (1) The 3.25 percent convertible notes due 2037 and 7.875 percent convertible notes due 2026 contain a put and call feature, which allows for early redemption beginning in 2025 and 2020, respectively. (2) The 6.25 percent notes due 2024 and 2025 contain a call option, which allows for early redemption by Meritor. (3) The 3.25 percent convertible notes due 2037 are presented net of $5 million and $6 million unamortized issuance costs as of September 30, 2020 and September 30, 2019, respectively. (4) The 7.875 percent convertible notes due 2026 are presented net of unamortized issuance costs of an insignificant amount as of September 30, 2020 and September 30, 2019, an d an insignificant amount and $1 million original issuance discount as of September 30, 2020 and September 30, 2019, respectively. (5) The 6.25 percent notes due 2025 are presented net of $5 million unamortized issuance costs as of September 30, 2020. (6) The 6.25 percent notes due 2024 are presented net of $4 million and $6 million unamortized issuance costs as of September 30, 2020 and September 30, 2019, respectively (7) The carrying amount of the equity component related to convertible debt. Repurchase of Debt Securities On February 15, 2019, the company redeemed $19 million aggregate principal amount outstanding of its 4.0 percent convertible notes due 2027 (the "4.0 Percent Convertible Notes") at a price of 100 percent of the accreted principal amount, plus accrued and unpaid interest. On June 7, 2019, the company redeemed the remaining $5 million aggregate principal amount outstanding of the 4.0 Percent Convertible Notes at a price equal to 100 percent of the accreted principal amount, plus accrued and unpaid interest. As of September 30, 2019, the 4.0 Percent Convertible notes were fully redeemed. Current Classification of 7.875 Percent Convertible Notes The company's 7.875 percent convertible notes due 2026 (the "7.875 Percent Convertible Notes") were classified as current as of September 30, 2020. On October 16, 2020, the company announced that it had issued a notice of redemption for all of the outstanding $23 million aggregate accreted principal amount of the 7.875 Percent Convertible Notes. The redemption date is December 1, 2020 and the redemption price will be equal to 100% of the accreted principal amount of the 7.875 Percent Convertible Notes to be redeemed, plus accrued and unpaid interest, if any (including additional interest, if any), thereon up to but excluding the redemption date. From and after the redemption date, the 7.875 Percent Convertible Notes will no longer be outstanding, and interest will cease to accrue unless the company defaults in making the redemption payment. As a result of the issuance of the notice of redemption, the 7.875 Percent Convertible Notes are convertible at any time prior to the close of business on November 30, 2020 at a rate of 83.3333 shares of common stock per $1,000 original principal amount of the 7.875 Percent Convertible Notes (which is equivalent to a conversion price of approximately $12.00 per share). The 7.875 Percent Convertible Notes surrendered for conversion will be settled in cash up to the accreted principal amount of the 7.875 Percent Convertible Notes surrendered for conversion and cash, stock or a combination of cash and stock, at the company's election, for the remainder of the conversion obligation, if any, in excess of the accreted principal amount, in accordance with the provisions of the indenture that governs the 7.875 Percent Convertible Notes. The 7.875 Percent Convertible Notes were classified as current as of September 30, 2019 as the holders were entitled to convert all or a portion of their 7.875 Percent Convertible Notes at any time beginning October 1, 2019 and prior to the close of business on December 31, 2019 at a rate of 83.3333 shares of common stock per $1,000 principal amount at maturity of the 7.875 Percent Convertible Notes (representing a conversion price of approximately $12.00 per share). The 7.875 Percent Convertible Notes were convertible as the closing price of shares of the company's common stock for at least 20 trading days during the 30 consecutive trading-day period ending on September 30, 2019 was greater than 120 percent of the $12.00 conversion price associated with the 7.875 Percent Convertible Notes. The 7.875 Percent Convertible Notes surrendered for conversion, if any, would be settled in cash up to the principal amount at maturity of the 7.875 Percent Convertible Notes and cash, stock or a combination of cash and stock, at the company’s election, for the remainder of the conversion value of the 7.875 Percent Convertible Notes in excess of the principal amount at maturity and cash in lieu of any fractional shares, subject to and in accordance with the provisions of the indenture. 6.25 Percent Notes due 2025 On June 8, 2020, the company completed the offering and sale of $300 million aggregate principal amount of its 6.25 percent notes due 2025 (the "6.25 Percent Notes due 2025") to qualified institutional buyers in reliance on Rule 144A under the Securities Act of 1933, as amended (the "Securities Act"), and to non-U.S. persons in offshore transactions in reliance of Regulation S under the Securities Act in a private placement, exempt from the registration requirements of the Securities Act. The 6.25 Percent Notes due 2025 were issued pursuant to the company's indenture dated as of April 1, 1998, as supplemented. The net proceeds from the sale of the 6.25 Percent Notes due 2025 were $295 million and were used to repay approximately $295 million of the outstanding $304 million balance under the company's senior secured revolving credit facility. The 6.25 Percent Notes due 2025 will mature on June 1, 2025 and bear interest at a fixed rate of 6.25 percent per annum. The company will pay interest on the 6.25 Percent Notes due 2025 semi-annually, in arrears, on June 1 and December 1 of each year, beginning December 1, 2020. The 6.25 Percent Notes due 2025 will constitute senior unsecured obligations of the company and will rank equally in right of payment with its existing and future senior unsecured indebtedness, and effectively junior to its existing and future secured indebtedness to the extent of the security therefor. The 6.25 Percent Notes due 2025 provide that, prior to June 1, 2022, the company may redeem, at its option, from time to time, the 6.25 Percent Notes due 2025, in whole or in part, at a redemption price equal to the sum of (i) 100 percent of the principal amount of the 6.25 Percent Notes due 2025 to be redeemed, plus (ii) the applicable premium as of the redemption date on the 6.25 Percent Notes due 2025 to be redeemed, plus (iii) accrued and unpaid interest, if any, to, but not including, the redemption date (subject to the right of holders of record on the relevant regular record date to receive interest due on an interest payment date that is on or prior to the redemption date) on the 6.25 Percent Notes due 2025 to be redeemed. For purposes of such calculation, the “applicable premium” means, with respect to the 6.25 Percent Notes due 2025 at any redemption date, the greater of (i) 1.0 percent of the principal amount of such 6.25 Percent Notes due 2025 and (ii) the excess of (A) the present value at such redemption date of (1) 103.125 percent of the principal amount of such 6.25 Percent Notes due 2025 plus (2) all remaining required interest payments due on such 6.25 Percent Notes due 2025 through June 1, 2022 (excluding accrued and unpaid interest, if any, to the redemption date), computed using a discount rate equal to the treasury rate plus 50 basis points, over (B) 100 percent of the principal amount of such 6.25 Percent Notes due 2025. The 6.25 Percent Notes due 2025 provide that, on or after June 1, 2022, the company may redeem, at its option, from time to time, the 6.25 Percent Notes due 2025, in whole or in part, at the redemption prices (expressed as percentages of the principal amount of the 6.25 Percent Notes due 2025 to be redeemed) set forth below, plus accrued and unpaid interest, if any, to, but not including, the redemption date (subject to the right of holders of record on the relevant regular record date to receive interest due on an interest payment date that is on or prior to the redemption date) on the 6.25 Percent Notes due 2025 to be redeemed, if redeemed during the 12-month period beginning on June 1 of the years indicated below: Year Redemption Price 2022 103.125 % 2023 101.563 % 2024 and thereafter 100.000 % The 6.25 Percent Notes due 2025 provide that, prior to June 1, 2022, the company may redeem, at its option, from time to time, up to 35 percent of the aggregate principal amount of the 6.25 Percent Notes due 2025 with the net cash proceeds of one or more public sales of the company’s common stock at a redemption price equal to 106.25 percent of the principal amount of the 6.25 Percent Notes due 2025 to be redeemed, plus accrued and unpaid interest, if any, to, but not including, the redemption date (subject to the right of holders of record on the relevant regular record date to receive interest due on an interest payment date that is on or prior to the redemption date) on the 6.25 Percent Notes due 2025 to be redeemed so long as at least 65 percent of the aggregate principal amount of the 6.25 Percent Notes due 2025 remains outstanding after each such redemption and notice of any such redemption is mailed within 90 days of any such sale of common stock. If a Change of Control (as defined in the eighth supplemental indenture under which the 6.25 Percent Notes due 2025 were issued) occurs, unless the company has exercised its right to redeem the 6.25 Percent Notes due 2025, each holder of 6.25 Percent Notes due 2025 may require the company to repurchase some or all of such holder’s 6.25 Percent Notes due 2025 at a purchase price equal to 101 percent of the principal amount of the 6.25 Percent Notes due 2025 to be repurchased, plus accrued and unpaid interest, if any, to, but not including, the payment date (subject to the right of holders of record on the relevant regular record date to receive interest due on an interest payment date that is on or prior to the payment date) on the 6.25 Percent Notes due 2025 to be repurchased. Senior Secured Revolving Credit Facility On June 7, 2019, the company amended and restated its senior secured revolving credit facility. Pursuant to the revolving credit agreement, as amended, the company has a $625 million senior secured revolving credit facility and a $175 million term loan facility, which was utilized for the company's acquisition of AxleTech, that mature in June 2024 (with a springing maturity in November 2023 if the outstanding amount of the company's 6.25 percent notes due 2024 is greater than $75 million at that time). The availability under this facility is dependent upon various factors, including performance against certain financial covenants as highlighted below. The availability under the senior secured revolving credit facility is subject to a financial covenant based on the ratio of the company’s priority debt (consisting principally of amounts outstanding under the revolving credit facility, the U.S. accounts receivable securitization and factoring programs, and third-party non-working capital foreign debt) to EBITDA. The company is required to maintain a total priority-debt-to-EBITDA ratio, as defined in the revolving credit agreement, of 2.25 to 1.00 or less as of the last day of each fiscal quarter throughout the term of the agreement. Borrowings under the senior secured revolving credit facility are subject to interest based on quoted LIBOR rates plus a margin and a commitment fee on undrawn amounts, both of which are based upon the company's current corporate credit rating. At September 30, 2020, the margin over LIBOR rate was 200 basis points, and the commitment fee was 30 basis points. Overnight revolving credit loans are at the prime rate plus a margin of 100 basis points. Certain of the company's 100% owned subsidiaries, as defined in the revolving credit agreement (collectively, the "Guarantors") irrevocably and unconditionally guarantee amounts outstanding under the senior secured revolving credit facility on a joint and several basis. Similar subsidiary guarantees are provided for the benefit of the holders of the notes outstanding under the company's indentures. The notes are guaranteed on a senior unsecured basis by each of the company’s subsidiaries from time to time guaranteeing its senior secured revolving credit facility, as it may be amended, extended, replaced or refinanced, or any subsequent credit facility. The guarantees remain in effect until the earlier to occur of payment in full of the notes or termination or release of the applicable corresponding guarantee under the company’s senior secured revolving credit facility, as it may be amended, extended, replaced or refinanced, or any subsequent credit facility. The guarantees rank equally with existing and future senior unsecured indebtedness of the Guarantors and are effectively subordinated to all of the existing and future secured indebtedness of the Guarantors, to the extent of the value of the assets securing such indebtedness. No borrowings were outstanding under the senior secured revolving credit facility at September 30, 2020 and September 30, 2019. The amended and extended senior secured revolving credit facility includes $100 million of availability for the issuance of letters of credit. At September 30, 2020 and September 30, 2019, there were no letters of credit outstanding under the senior secured revolving credit facility. On November 9, 2020, the senior secured revolving credit facility was increased by $60 million to $685 million through the addition of a new lender. Debt Securities In December 2017, the company filed a shelf registration statement with the SEC, registering an indeterminate amount of debt and/or equity securities that the company may offer in one or more offerings on terms to be determined at the time of sale. The December 2017 shelf registration statement superseded and replaced the shelf registration statement filed in December 2014, as amended. 3.25 Percent Convertible Notes The company's 3.25 percent convertible notes due 2037 (the "3.25 Percent Convertible Notes") are fully and unconditionally guaranteed on a senior unsecured basis by the Guarantors. The 3.25 Percent Convertible Notes are the company’s senior unsecured obligations and rank equally in right of payment with all of the company’s existing and future senior unsecured indebtedness and effectively junior to any of the company’s existing and future secured indebtedness, to the extent of the value of the assets securing such indebtedness. The guarantee by each Guarantor ranks equally with existing and future senior unsecured indebtedness of such Guarantor and effectively junior to all of the existing and future secured indebtedness of such Guarantor, to the extent of the value of the assets securing such indebtedness. The 3.25 Percent Convertible Notes will be convertible into cash up to the principal amount of the 3.25 Percent Convertible Notes surrendered for conversion and the company will pay or deliver, as the case may be, cash, shares of the company’s common stock or a combination of cash and shares of the company’s common stock, at the company’s election, in respect of the remainder, if any, of the company’s conversion obligation in excess of the principal amount of the notes being converted. The initial conversion rate, subject to adjustment, is 25.0474 shares of common stock per $1,000 principal amount of the 3.25 Percent Convertible Notes (which represents an initial conversion price of $39.92 per share). Holders may convert their notes, at their option, only under the following circumstances prior to the close of business on the business day immediately preceding July 15, 2037, other than during the period from and including July 15, 2025 to the close of business on the business day immediately preceding October 15, 2025: • during any calendar quarter after the calendar quarter ending on December 31, 2017, if the closing sale price of the company’s common stock for 20 or more trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on and including the last trading day of the immediately preceding calendar quarter equals or exceeds 130 percent of the applicable conversion price on each applicable trading day; • during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount of the 3.25 Percent Convertible Notes for each trading day during such five consecutive trading day period was less than 98 percent of the product of the closing price of the company’s common stock and the conversion rate on each such trading day; • if the company calls any of the 3.25 Percent Convertible Notes for redemption, at any time from the delivery of the redemption notice through the close of business on the scheduled trading day immediately preceding the redemption date; or • upon the occurrence of specified corporate transactions. During the period from and including July 15, 2025 to the close of business on the business day immediately preceding October 15, 2025, and on or after July 15, 2037 until the close of business on the business day immediately preceding the maturity date, holders may convert 3.25 Percent Convertible Notes at any time, regardless of the foregoing circumstances. On or after October 15, 2025, but prior to July 15, 2037, the company may redeem the 3.25 Percent Convertible Notes at the company’s option, in whole or in part, at a redemption price in cash equal to 100 percent of the principal amount of the 3.25 Percent Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. Further, holders may require the company to purchase all or a portion of their 3.25 Percent Convertible Notes at a purchase price in cash equal to 100 percent of the principal amount of the 3.25 Percent Convertible Notes to be purchased, plus accrued and unpaid interest to, but excluding, the repurchase date, on October 15, 2025 or upon certain fundamental changes. The maximum number of shares of common stock into which the 3.25 Percent Convertible Notes are convertible is approximately 8 million shares. 6.25 Percent Notes due 2024 The 6.25 percent notes due 2024 ("6.25 Percent Notes due 2024") constitute senior unsecured obligations of the company and rank equally in right of payment with existing and future senior unsecured indebtedness and effectively junior to existing and future secured indebtedness. The 6.25 Percent Notes due 2024 are guaranteed on a senior unsecured basis by each of the Guarantors. The guarantees rank equally with existing and future senior unsecured indebtedness of the Guarantors and are effectively subordinated to all of the existing and future secured indebtedness of the Guarantors, to the extent of the value of the assets securing such indebtedness. Prior to February 15, 2019, the company could redeem, at its option, from time to time, the 6.25 Percent Notes due 2024, in whole or in part, at a redemption price equal to 100 percent of the principal amount of the 6.25 Percent Notes due 2024 to be redeemed, plus an applicable make-whole premium (as defined in the indenture under which the 6.25 Percent Notes due 2024 were issued) and any accrued and unpaid interest. On or after February 15, 2019, the company may redeem, at its option, from time to time, the 6.25 Percent Notes due 2024, in whole or in part, at the redemption prices (expressed as percentages of the principal amount of the 6.25 Percent Notes due 2024 to be redeemed) set forth below, plus accrued and unpaid interest, if any, if redeemed during the 12-month period beginning on February 15 of the years indicated below: Year Redemption Price 2019 103.125% 2020 102.083% 2021 101.042% 2022 and thereafter 100.000% If a Change of Control (as defined in the indenture under which the 6.25 Percent Notes due 2024 were issued) occurs, unless the company has exercised its right to redeem the 6.25 Percent Notes due 2024, each holder of 6.25 Percent Notes due 2024 may require the company to repurchase some or all of such holder's 6.25 Percent Notes due 2024 at a purchase price equal to 101 percent of the principal amount of the 6.25 Percent Notes due 2024 to be repurchased, plus accrued and unpaid interest, if any. 7.875 Percent Convertible Notes The 7.875 Percent Convertible Notes are fully and unconditionally guaranteed on a senior unsecured basis by each of the Guarantors. The 7.875 Percent Convertible Notes are senior unsecured obligations and rank equally in right of payment with all of the company's existing and future senior unsecured indebtedness and are junior to any of the company's existing and future secured indebtedness. The 7.875 Percent Convertible Notes will be convertible into cash up to the principal amount at maturity of the 7.875 Percent Convertible Note surrendered for conversion and, if applicable, shares of the company's common stock (subject to a conversion share cap as described below), based on an initial conversion rate, subject to adjustment, equivalent to 83.3333 shares per $1,000 principal amount at maturity of 7.875 Percent Convertible Notes (which represents an initial conversion price of $12.00 per share), only under the following circumstances: • prior to June 1, 2025, during any calendar quarter after the calendar quarter ending December 31, 2012, if the closing sale price of the company's common stock for 20 or more trading days in a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter exceeds 120 percent of the applicable conversion price in effect on the last trading day of the immediately preceding calendar quarter; • prior to June 1, 2025, during the five business day period after any five consecutive trading day period in which the trading price per $1,000 principal amount at maturity of 7.875 Percent Convertible Notes was equal to or less than 97 percent of the conversion value of the 7.875 Percent Convertible Notes on each trading day during such five consecutive trading day period; • prior to June 1, 2025, if the company has called the 7.875 Percent Convertible Notes for redemption; • prior to June 1, 2025, upon the occurrence of specified corporate transactions; or • at any time on or after June 1, 2025. On or after December 1, 2020, the company may redeem the 7.875 Percent Convertible Notes at its option, in whole or in part, at a redemption price in cash equal to 100 percent of the principal amount at maturity of the 7.875 Percent Convertible Notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. Further, holders may require the company to purchase all or a portion of their 7.875 Percent Convertible Notes at a purchase price in cash equal to 100 percent of the principal amount at maturity of the 7.875 Percent Convertible Notes to be purchased, plus accrued and unpaid interest, on December 1, 2020 or upon certain fundamental changes. The maximum number of shares of common stock into which the 7.875 Percent Convertible Notes are convertible is approximately 2 million shares. The following table summarizes the principal amounts and related unamortized discount on all convertible notes (in millions): September 30, 2020 2019 Principal amount of convertible notes $ 348 $ 348 Unamortized discount on convertible notes and issuance costs (34) (40) Net carrying value $ 314 $ 308 The following table summarizes other information related to the convertible notes: Convertible Notes 7.875% 3.25% Total amortization period for debt discount (in years): 8 8 Remaining amortization period for debt discount (in years): 0 5 Effective interest rates on convertible notes: 10.9 % 5.6 % The following table summarizes interest costs recognized on convertible notes (in millions): Year Ended September 30, 2020 2019 2018 Contractual interest coupon $ 17 $ 17 $ 17 Amortization of debt discount 2 2 2 Total $ 19 $ 19 $ 19 Debt Maturities As of September 30, 2020, the company is contractually obligated to make payments as follows (in millions): Total 2021 (2) 2022 2023 2024 (3) 2025 (4) Thereafter (5) Total debt (1) $ 1,265 $ 36 $ 18 $ 13 $ 573 $ 300 $ 325 (1) Total debt excludes unamortized discount on convertible notes of $29 million, unamortized issuance costs of $14 million, and original issuance discount of an insignificant amount. (2) Includes the 7.875 Percent Convertible Notes, which will be early redeemed on December 1, 2020 (3) Includes the 6.25 Percent Notes due 2024, which contain a call feature that allows for early redemption (4) Includes the 6.25 Percent Notes due 2025, which contain a call feature that allows for early redemption (5) Includes the 3.25 Percent Convertible Notes which contain a put and call feature that allows for early redemption beginning in 2025 Letter of Credit Facilities On February 21, 2014, the company entered into an arrangement to amend and restate the letter of credit facility with Citicorp USA, Inc., as administrative agent and issuing bank, and the other lenders party thereto. Under the terms of this amended credit agreement, which expired in March 2019, the company had the right to obtain the issuance, renewal, extension and increase of letters of credit up to an aggregate availability of $25 million. This facility contained covenants and events of default generally similar to those existing in the company’s public debt indentures. There were $1 million of letters of credit outstanding under this facility at September 30, 2018. On March 20, 2019, the company allowed this facility to expire. The letters of credit previously provided under this facility were replaced with letters of credit issued under the company's U.S. accounts receivables securitization facility with PNC Bank. The company had $11 million and $12 million of letters of credit outstanding through letter of credit facilities as of September 30, 2020 and 2019, respectively. Other

FINANCIAL INSTRUMENTS

FINANCIAL INSTRUMENTS	12 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
FINANCIAL INSTRUMENTS	FINANCIAL INSTRUMENTS The company’s financial instruments include cash and cash equivalents, short-term debt, long-term debt, and foreign exchange forward and options contracts. The company uses derivatives for hedging and non-trading purposes in order to manage its foreign exchange rate exposures. Foreign Exchange Contracts As a result of the company’s substantial international operations, it is exposed to foreign currency risks that arise from normal business operations, including in connection with transactions that are denominated in foreign currencies. In addition, the company translates sales and financial results denominated in foreign currencies into U.S. dollars for purposes of its Consolidated Financial Statements. As a result, appreciation of the U.S. dollar against these foreign currencies generally will have a negative impact on reported revenues and operating income, while depreciation of the U.S. dollar against these foreign currencies will generally have a positive effect on reported revenues and operating income. The company has a foreign currency cash flow hedging program to reduce the company’s exposure to changes in exchange rates on foreign currency purchases and sales. The company uses foreign currency forward contracts to manage the company’s exposures arising from foreign currency exchange risk. Gains and losses on the underlying foreign currency exposures are partially offset with gains and losses on the foreign currency forward contracts. Under this foreign currency cash flow hedging program, the company has designated the foreign exchange contracts as cash flow hedges of underlying forecasted foreign currency purchases and sales. Changes in the fair value of these contracts are recorded in accumulated other comprehensive income (AOCI) in the Consolidated Balance Sheet and are recognized in operating income when the underlying forecasted transaction impacts earnings. The terms of these contracts generally require the company to place cash on deposit as collateral if the fair value of these contracts represents a liability for the company and exceeds the collateral threshold. The fair values of the foreign exchange derivative instruments and any related collateral cash deposits are presented on a net basis as the derivative contracts are subject to master netting arrangements. At September 30, 2020, 2019 and 2018, the notional amount of the company's foreign exchange contracts outstanding under its foreign currency cash flow hedging program was $65 million, $110 million, and $154 million, respectively. The company classifies the cash flows associated with these contracts in cash flows from operating activities in the Consolidated Statement of Cash Flows. This is consistent with the classification of the cash flows associated with the underlying hedged item. From time to time the company hedges against foreign currency exposure related to translations to U.S. dollars of financial results denominated in foreign currencies. Changes in fair value associated with these contracts are recorded in other income (expense), net, in the Consolidated Statement of Operations. The company also uses option contracts to mitigate foreign currency exposure on expected future foreign currency-denominated purchases. Changes in fair value associated with these contracts are recorded in cost of sales in the Consolidated Statement of Operations. The following table summarizes the impact of the company’s derivatives instruments on comprehensive income for fiscal years ended September 30 (in millions): Location of 2020 2019 2018 Derivatives designated as hedging instruments: Amount of gain recognized in AOCI AOCI $ 4 $ 19 $ 3 Amount of gain (loss) reclassified from AOCI into income Cost of Sales (1) 4 (1) Derivatives not designated as hedging instruments: Cost of Sales — — (2) Derivatives not designated as hedging instruments: Other Income (expense) 1 1 2 Fair Value Fair values of financial instruments are summarized as follows (in millions): September 30, 2020 September 30, 2019 Carrying Fair Carrying Fair Cash and cash equivalents $ 315 $ 315 $ 108 $ 108 Short-term debt 39 58 41 60 Long-term debt 1,188 1,259 902 953 Foreign currency option contracts (other assets) 1 1 — — Foreign exchange forward contracts (other liabilities) 1 1 — — Cross-currency swap (other assets) — — 10 10 Cross-currency swaps (other liabilities) — — 5 5 Cash and cash equivalents — All highly liquid investments purchased with an original maturity of three months or less are considered to be cash equivalents. The carrying value approximates fair value because of the short maturity of these instruments. Short- and long-term debt — Fair values are based on transaction prices at public exchange for publicly traded debt. For debt instruments that are not publicly traded, fair values are based on interest rates that would be currently available to the company for issuance of similar types of debt instruments with similar terms and remaining maturities. Foreign exchange forward contracts — The company uses foreign exchange forward purchase and sale contracts with terms of 18 months or less to hedge its exposure to changes in foreign currency exchange rates. As of September 30, 2020 and September 30, 2019, the notional amount of the company's foreign exchange contracts outstanding under its foreign currency cash flow hedging program was $65 million and $110 million, respectively. The fair value of foreign exchange forward contracts is based on a model which incorporates observable inputs including quoted spot rates, forward exchange rates and discounted future expected cash flows utilizing market interest rates with similar quality and maturity characteristics. For derivative instruments that are designated and qualify as cash flow hedges, changes in the fair value of the contracts are recorded in AOCI in the Consolidated Statement of Shareholders’ Equity and is recognized in operating income when the underlying forecasted transaction impacts earnings. Foreign currency option contracts — The company uses option contracts to mitigate foreign exchange exposure on expected future foreign currency-denominated purchases. As of September 30, 2020 and September 30, 2019, the notional amount of the foreign exchange option contracts outstanding was $39 million and $139 million, respectively. The company did not elect hedge accounting for these derivatives. Changes in fair value associated with these contracts are recorded in cost of sales in the Consolidated Statement of Operations. The company uses option contracts to mitigate the risk of volatility in the translation of foreign currency earnings to U.S. dollars. As of September 30, 2020 and September 30, 2019, the notional amount of the company's option contracts outstanding was $24 million and $28 million, respectively. These option contracts did not qualify for a hedge accounting election. Changes in fair value associated with these contracts are recorded in the Consolidated Statement of Operations in other income, net. The fair value of foreign exchange option contracts is based on third-party proprietary models, which incorporate inputs at varying unobservable weights of quoted spot rates, market volatility, forward rates and time utilizing market instruments with similar quality and maturity characteristics. Cross-currency swap contracts — The company uses cross-currency swap contracts to hedge a portion of its net investment in a foreign subsidiary against volatility in foreign exchange rates. These derivative instruments are designated and qualify as hedges of net investments in foreign operations using the spot method to assess effectiveness. Settlements and changes in fair values of the instruments are recognized in foreign currency translation adjustments, a component of other comprehensive income (loss) on the Consolidated Statement of Comprehensive Income (Loss), to offset the changes in the values of the net investments being hedged. In the third quarter of fiscal year 2019, the company entered into multiple new cross-currency swaps with a combined notional amount of $225 million and maturities in October 2022. As of September 30, 2019, the notional amount of the company's outstanding cross-currency swaps was $225 million. These swaps hedged a portion of the net investment in a certain European subsidiary against volatility in the euro/U.S. dollar foreign exchange rate. In the second quarter of fiscal year 2020, the company settled these cross-currency swap contracts and received proceeds of $11 million, $1 million of which related to net accrued interest receivable. In the third quarter of fiscal year 2018, the company entered into multiple cross-currency swaps with a combined notional amount of $225 million, which were to mature in May 2021. These swaps hedged a portion of the net investment in a certain European subsidiary against volatility in the euro/U.S. dollar foreign exchange rate. In the third quarter of fiscal year 2019, the company unwound the cross-currency swaps and received proceeds of $19 million, $2 million of which related to net accrued interest receivable. The fair value of cross-currency swap contracts is based on a model which incorporates observable inputs, including quoted spot rates, forward exchange rates and discounted future expected cash flows, utilizing market interest rates with similar quality and maturity characteristics. The following table reflects the offsetting of derivative assets and liabilities (in millions): September 30, 2020 September 30, 2019 Gross Gross Amounts Net Amounts Gross Gross Amounts Net Amounts Derivative Asset Foreign currency option contract 1 — 1 — — — Cross-currency swaps — — — 10 — 10 Derivative Liabilities Foreign exchange forward contract 1 — 1 — — — Cross-currency swaps — — — 5 — 5 Fair Value The current FASB guidance provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical instruments (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below: • Level 1 inputs use quoted prices in active markets for identical instruments. • Level 2 inputs use other inputs that are observable, either directly or indirectly. These Level 2 inputs include quoted prices for similar instruments in active markets and other inputs such as interest rates and yield curves that are observable at commonly quoted intervals. • Level 3 inputs are unobservable inputs, including inputs that are available in situations where there is little, if any, market activity for the related instrument. In instances where inputs used to measure fair value fall into different levels in the above fair value hierarchy, fair value measurements in their entirety are categorized based on the lowest priority level input that is significant to the valuation. The company's assessment of the significance of particular inputs to these fair value measurements requires judgment and considers factors specific to each asset or liability. Fair value of financial instruments by the valuation hierarchy at September 30, 2020 is as follows (in millions): Level 1 Level 2 Level 3 Cash and cash equivalents $ 315 $ — $ — Short-term debt — 43 15 Long-term debt — 1,103 156 Foreign exchange forward contracts (asset) — — — Foreign exchange forward contracts (liability) — 1 — Foreign currency option contracts (other assets) — 1 — Cross-currency swaps (other assets) — — — Cross-currency swaps (other liabilities) — — — Fair value of financial instruments by the valuation hierarchy at September 30, 2019 is as follows (in millions): Level 1 Level 2 Level 3 Cash and cash equivalents $ 108 $ — $ — Short-term debt — 49 11 Long-term debt — 782 171 Foreign exchange forward contracts (asset) — — — Foreign exchange forward contracts (liability) — — — Foreign currency option contracts (other assets) — — — Cross-currency swaps (other assets) — 10 — Cross-currency swaps (other liabilities) — 5 — The tables below provide a reconciliation of changes in fair value of the Level 3 financial assets and liabilities measured at fair value in the Consolidated Balance Sheet for the twelve months ended September 30, 2020 and September 30, 2019, respectively. No transfers of assets between any of the Levels occurred during these periods. Twelve months ended September 30, 2020 (in millions) Short-term foreign currency option contracts (asset) Long-term foreign currency option contracts (asset) Total Fair Value as of September 30, 2019 $ — $ — $ — Total unrealized gains: Included in other income — — — Included in cost of sales — — — Total realized gains: Included in other income 1 — 1 Included in cost of sales — — — Purchases, issuances, sales and settlements: Purchases 2 — 2 Settlements (2) — (2) Transfer in and / or out of Level 3 (1) — — — Reclass between short-term and long-term — — — Fair Value as of September 30, 2020 $ 1 $ — $ 1 (1) Transfers as of the last day of the reporting period Twelve months ended September 30, 2019 (in millions) Short-term foreign currency option/collar contracts (asset) Long-term foreign currency option/collar contracts (asset) Total Fair Value as of September 30, 2018 $ — $ — $ — Total unrealized gains: Included in other income (1) — (1) Included in cost of sales 1 — 1 Total realized gains: Included in other income 1 — 1 Included in cost of sales — — — Purchases, issuances, sales and settlements: Purchases — — — Settlements (1) — (1) Transfer in and / or out of Level 3 (1) — — — Reclass between short-term and long-term — — — Fair Value as of September 30, 2019 $ — $ — $ — (1) Transfers as of the last day of the reporting period

SHAREHOLDERS' EQUITY

SHAREHOLDERS' EQUITY	12 Months Ended
	Sep. 30, 2020
Equity [Abstract]
SHAREHOLDERS' EQUITY	SHAREHOLDERS’ EQUITY There were no dividends declared or paid by the company in fiscal years 2020, 2019 or 2018. The payment of cash dividends and the amount of any dividend are subject to review and change at the discretion of the company's Board of Directors. The company is authorized to issue 500 million shares of common stock, with a par value of $1 per share, and 30 million shares of preferred stock, without par value ("Preferred Stock"), of which 2 million shares are designated as Series A Junior Participating Preferred Stock ("Junior Preferred Stock"). No shares of Preferred Stock or Junior Preferred Stock have been issued. In December 2017, the company filed a shelf registration statement with the SEC, registering an indeterminate amount of debt and/or equity securities that may be offered in one or more offerings on terms to be determined at the time of sale. The company has reserved approximately 4 million shares of common stock in connection with its 2020 Long-Term Incentive Plan ("LTIP") for grants of non-qualified stock options, incentive stock options, stock appreciation rights, restricted stock, performance shares, restricted share units and stock awards to key employees and directors. At September 30, 2020, there were 4.1 million shares available for future grants under the LTIP. Repurchase Authorizations On July 26, 2019, the Board of Directors authorized the repurchase of up to $250 million of the company’s common stock from time to time through open market purchases, privately negotiated transactions or otherwise, subject to compliance with legal and regulatory requirements and the company’s debt covenants. This authorization superseded the remaining authority under the prior November 2018 equity repurchase authorization described below. On November 7, 2019, the Board of Directors increased the amount of the repurchase authorization to $325 million. During fiscal year 2020, the company repurchased 10.4 million shares of common stock for $241 million (including commission costs) pursuant to the common stock repurchase authorization. As of September 30, 2020, the amount remaining available for repurchases was $59 million under this common stock repurchase authorization. On November 2, 2018, the Board of Directors authorized the repurchase of up to $200 million of the company's common stock and up to $100 million aggregate principal amount of any of the company's debt securities (including convertible debt securities), in each case from time to time through open market purchases, privately negotiated transactions or otherwise, subject to compliance with legal and regulatory requirements and the company's debt covenants. During fiscal year 2019, the company repurchased 4.0 million shares of common stock for $71 million (including commission costs) pursuant to the common stock repurchase authorization. As of September 30, 2020, the amount remaining available for debt repurchases was $76 million under the debt repurchase authorization. This authorization superseded the remaining authority under the prior July 2016 repurchase authorizations. On July 21, 2016, the Board of Directors authorized the repurchase of up to $100 million of the company’s common stock and up to $150 million aggregate principal amount of any of the company’s debt securities (including convertible debt securities), in each case from time to time through open market purchases, privately negotiated transactions or otherwise, until September 30, 2019, subject to compliance with legal and regulatory requirements and the company's debt covenants. During fiscal year 2018, the company repurchased 4.5 million shares of common stock for $100 million (including commission costs), pursuant to the July 2016 common stock repurchase authorization. The repurchase program under the July 2016 authorization was complete as of September 30, 2018. The amount remaining available for repurchases under the debt repurchase authorization was $50 million as of September 30, 2018. There was an insignificant amount of common stock and $100 million in debt security repurchases that were made under these authorizations during fiscal year 2017. Accumulated Other Comprehensive Income (AOCI) The components of AOCI as reported in the Consolidated Balance Sheet and Statement of Equity, and the changes in AOCI by components, net of tax, are as follows (in millions): Foreign Currency Translation Employee Benefit Related Adjustments Unrealized Income (Loss) on cash flow hedges Total Balance at September 30, 2019 $ (107) $ (572) $ (2) $ (681) Other comprehensive income (loss) before reclassification (22) 79 (1) 56 Amounts reclassified from accumulated other comprehensive income — 10 1 11 Net current-period other comprehensive income (loss) $ (22) $ 89 $ — $ 67 Balance at September 30, 2020 $ (129) $ (483) $ (2) $ (614) Details about Accumulated Other Comprehensive Income Components Amount Reclassified from Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Operations Employee Benefit Related Adjustment Amortization of prior service benefit $ (36) (a) Amortization of actuarial losses 47 (a) 11 Total before tax (1) Tax (benefit) expense Total reclassifications for the period $ 10 Net of tax (a ) These accumulated other comprehensive income components are included in the computation of net periodic pension and retiree medical expense (see Notes 19 and 20 for additional details), which is recorded in other income (expense), net. Foreign Currency Translation Employee Benefit Related Adjustments Unrealized Income (Loss) on cash flow hedges Total Balance at September 30, 2018 $ (90) $ (476) $ — $ (566) Other comprehensive income (loss) before reclassification (17) (100) 2 (115) Amounts reclassified from accumulated other comprehensive income (loss) — 4 (4) — Net current-period other comprehensive loss $ (17) $ (96) $ (2) $ (115) Balance at September 30, 2019 $ (107) $ (572) $ (2) $ (681) Details about Accumulated Other Comprehensive Income Components Amount Reclassified from Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Operations Employee Benefit Related Adjustment Amortization of prior service benefit $ (35) (a) Amortization of actuarial losses 39 (a) 4 Total before tax — Tax (benefit) expense Total reclassifications for the period $ 4 Net of tax (a) These accumulated other comprehensive income components are included in the computation of net periodic pension and retiree medical expense (see Notes 19 and 20 for addi tional details), which is recorded in other income (expense), net. Foreign Currency Translation Employee Benefit Related Adjustments Unrealized Income (Loss) on cash flow hedges Total Balance at September 30, 2017 $ (41) $ (500) $ (4) $ (545) Other comprehensive income (loss) before reclassification (49) 8 3 (38) Amounts reclassified from accumulated other comprehensive income — 16 1 17 Net current-period other comprehensive income (loss) $ (49) $ 24 $ 4 $ (21) Balance at September 30, 2018 $ (90) $ (476) $ — $ (566) Details about Accumulated Other Comprehensive Income Components Amount Reclassified from Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Operations Employee Benefit Related Adjustment Amortization of prior service benefit $ (35) (a) Amortization of actuarial losses 46 (a) Recognized prior service costs due to settlement 6 (a) 17 Total before tax (1) Tax (benefit) expense Total reclassifications for the period $ 16 Net of tax (a) These accumulated other comprehensive income components are included in the computation of net periodic pension and retiree medical expense (see Notes 19 and 20 for additional details), which is recorded in other income (expense), net.

EQUITY BASED COMPENSATION

EQUITY BASED COMPENSATION	12 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
EQUITY BASED COMPENSATION	EQUITY BASED COMPENSATION Restricted Stock and Restricted Share Units The company has granted shares of restricted stock and restricted share units to certain employees and non-employee members of the Board of Directors in accordance with its existing plans. The company measures the grant date fair value of these stock-based awards at the market price of the company’s common stock as of the date of the grant. Employee awards typically vest at the end of three years and are subject to continued employment by the employee. Compensation cost associated with stock-based awards is recognized ratably over the vesting period. Cash dividends on the restricted stock, if any, are reinvested in additional shares of common stock during the vesting period. The following is a rollforward of the company’s non-vested restricted stock and restricted share units as of September 30, 2020, and the activity during fiscal year 2020 is summarized as follows (shares in thousands): Number of Weighted-Average Balance at September 30, 2019 1,320 $ 17.55 Granted 558 23.77 Vested (533) 13.57 Forfeited (170) 21.41 Balance at September 30, 2020 1,175 21.75 In fiscal years 2020, 2019 and 2018, the company granted 0.6 million, 0.5 million, and 0.4 million shares of restricted stock and restricted share units, respectively. The grant date weighted average fair value of these shares of restricted stock and restricted share units was $23.77, $17.24 and $24.93 for shares of restricted stock and restricted share units granted in fiscal years 2020, 2019 and 2018, respectively. As of September 30, 2020, there was $9 million of total unrecognized compensation costs related to non-vested shares of restricted stock and restricted share units. These costs are expected to be recognized over a weighted average period of 1.84 years. Total compensation expense recognized for restricted stock and restricted share units was $8 million in each of fiscal years 2020, 2019 and 2018. Performance Share Units The company has granted performance share units to all executives eligible to participate in the LTIP. The company measures the grant date fair value of these units-based awards at the market price of the company’s common stock as of the date of the grant. Compensation cost associated with these stock-based awards is recognized ratably over the vesting period. Refer to Note 2 for descriptions of the performance share unit awards. The following is a rollforward of the company’s non-vested performance share units as of September 30, 2020, and the activity during fiscal year 2020 is summarized as follows (shares in thousands): Number of Weighted-Average Balance at September 30, 2019 1,325 $ 17.08 Granted 732 19.42 Vested (851) 12.92 Forfeited (170) 20.90 Balance at September 30, 2020 1,036 21.52 There were 0.7 million performance share units granted during fiscal 2020 which includes the performance achievement of 0.3 million performance share units related to the fiscal year 2017 to 2019 LTIP cycle. For the year ended September 30, 2020, compensation costs recognized for the performance share units was $1 million of income due to decreased performance payouts. For the years ended 2019 and 2018, compensation cost recognized related to the performance share units were $10 million and $14 million, respectively. As of September 30, 2020, there were $9 million of total unrecognized compensation costs related to non-vested performance share unit equity compensation arrangements. These costs are expected to be recognized over a weighted average period of 1.86 years.

RETIREMENT MEDICAL PLANS

RETIREMENT MEDICAL PLANS	12 Months Ended
	Sep. 30, 2020
Defined Benefit Plan, Postretirement Medical Plan with Prescription Drug Benefits [Abstract]
RETIREMENT MEDICAL PLANS	RETIREMENT MEDICAL PLANS The company has retirement medical plans that cover certain of its U.S. and non-U.S. employees, including certain employees of divested businesses, and provide for medical payments to eligible employees and dependents upon retirement. These plans are unfunded. On September 17, 2020, the company notified certain medical plan participants that it will further amend the benefits provided to these former union employee retirees. Under these modifications, which may be amended at the company’s discretion at any time, the company reduced the defined contribution to $500 per year until 2024. These benefit modifications generated a $7 million prior service credit in September 2020, which will be amortized over the retirees’ average life expectancy, which is currently estimated to be 9 years. On September 23, 2019, the company notified certain medical plan participants that it will amend the benefits provided to these former union employee retirees. Under these modifications, which may be amended at the company’s discretion at any time, the company reduced the defined contribution to $3,000 in 2020, decreasing by $600 each year thereafter until 2024. These benefit modifications generated a $15 million prior service credit in September 2019, which will be amortized over the retirees’ average life expectancy, which is currently estimated to be 9 years. On September 8, 2017, the company determined to modify the benefits provided to certain former union employee retirees. Under these modifications, which may be amended at the company’s discretion at any time, the company expected to provide (i) each retiree over the age of 65 with a defined contribution of $4,000 annually and (ii) each retiree under the age of 65 with a level of benefits generally equivalent to those currently provided to the company’s active employees, in each case and as currently contemplated, for a period of seven years. These benefit modifications generated a $315 million prior service credit in September 2017, which will be amortized over the retirees’ average life expectancy, which is currently estimated to be 9 years. The mortality assumptions for participants in the company’s U.S. plans incorporates future mortality improvements from tables published by the Society of Actuaries ("SOA"). The company reviewed the new SOA mortality and mortality improvement tables and utilized an actuary to conduct a study based on the company’s plan participants. The company determined that the best representation of the plans' mortality is to utilize the new SOA mortality and mortality improvement tables as the reference table for credibility-weighted mortality rates, blended with company-specific mortality based on the study conducted by the actuary. The company considers improvement scales released annually by the SOA. The company’s retiree medical obligations were measured as of September 30, 2020, 2019 and 2018. The following are the assumptions used in the measurement of the accumulated postretirement benefit obligation ("APBO") and retiree medical expense: 2020 2019 2018 Discount rate 2.56 % 2.98 % 4.05 % Health care cost trend rate 6.07 % 6.36 % 6.18 % Ultimate health care trend rate 4.67 % 4.69 % 4.63 % Year ultimate rate is reached 2028 2028 2024 The assumptions noted above are used to calculate the APBO for each fiscal year end and retiree medical expense for the subsequent fiscal year. The discount rate is used to calculate the present value of the APBO. This rate is determined based on high-quality fixed income investments that match the duration of expected retiree medical benefits. The company has used the corporate AA/Aa bond rate for this assumption. The health care cost trend rate represents the company’s expected annual rates of change in the cost of health care benefits. The company’s projection for fiscal year 2021 health care cost trend rate is 6.07 percent. The APBO as of the September 30, 2020 and 2019 measurement dates are summarized as follows (in millions): 2020 2019 Retirees $ 52 $ 67 Employees eligible to retire — — Total $ 52 $ 67 The following reconciles the change in APBO and the amounts included in the Consolidated Balance Sheet for years ended September 30, 2020 and 2019, respectively (in millions): 2020 2019 APBO — beginning of year $ 67 $ 86 Interest cost 2 3 Actuarial loss (gain) — 4 Plan amendment (7) (15) Benefit payments (1) (10) (11) APBO — end of year 52 67 Retiree medical liability $ 52 $ 67 (1) Net of subsidies and rebates available under Employer Group Waiver Plan ("EGWP"). Actuarial loss (gain) relates to changes in the discount rate and other actuarial assumptions. In accordance with ASC Topic 715, "Compensation – Retirement Benefits", a portion of the actuarial losses is not subject to amortization. The actuarial losses that are subject to amortization are generally amortized over the average lifetime of inactive participants of approximately 11 years. The retiree medical liability is included in the Consolidated Balance Sheet as follows (in millions): September 30, 2020 2019 Current — included in compensation and benefits $ 6 $ 11 Long-term — included in retirement benefits 46 56 Retiree medical liability $ 52 $ 67 The following table summarizes the amounts included in AOCL net of tax related to retiree medical liabilities as of September 30, 2020 and 2019 and changes recognized in Other Comprehensive Income (Loss) net of tax for the years ended September 30, 2020 and 2019. Net Actuarial Prior Total Balance at September 30, 2019 $ 70 $ (165) $ (95) Net actuarial loss for the year — — — Recognized prior service costs due to plan amendment — (7) (7) Amortization for the year (14) 36 22 Deferred tax impact 8 (3) 5 Balance at September 30, 2020 $ 64 $ (139) $ (75) Balance at September 30, 2018 $ 76 $ (178) $ (102) Net actuarial gain for the year 4 — 4 Recognized prior service costs due to plan amendment — (15) (15) Amortization for the year (15) 35 20 Deferred tax impact 5 (7) (2) Balance at September 30, 2019 $ 70 $ (165) $ (95) The net actuarial loss and prior service benefit that are estimated to be amortized from AOCL into net periodic retiree medical income in fiscal year 2021 are $(13) million and $35 million, respectively. The components of retiree medical expense for the years ended September 30 are as follows (in millions): 2020 2019 2018 Service cost $ — $ — $ — Interest cost 2 3 3 Amortization of: Prior service benefit (36) (35) (35) Actuarial losses 14 15 17 Retiree medical income $ (20) $ (17) $ (15) A one-percentage point change in the assumed health care cost trend rate for all years to, and including, the ultimate rate would have the following effects (in millions): 2020 2019 Effect on total service and interest cost 1% Increase $ — $ — 1% Decrease — — Effect on APBO 1% Increase 6 5 1% Decrease (5) (4) The company expects future benefit payments as follows (in millions): Gross Gross Receipts (1) Fiscal 2021 $ 6 $ — Fiscal 2022 5 — Fiscal 2023 5 — Fiscal 2024 4 — Fiscal 2025 4 — Fiscal 2026 – 2029 13 2 (1) Consists of subsidies and rebates available under EGWP.

RETIREMENT PENSION PLANS

RETIREMENT PENSION PLANS	12 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
RETIREMENT PENSION PLANS	RETIREMENT PENSION PLANS The company sponsors defined benefit pension plans that cover certain of its U.S. and non-U.S. employees. Pension benefits for salaried employees are based on years of credited service and compensation. Pension benefits for hourly employees are based on years of service and specified benefit amounts. The company’s funding policy provides that annual contributions to the pension trusts will be at least equal to the minimum amounts required by ERISA in the U.S. and the actuarial recommendations or statutory requirements in other countries. The mortality assumptions for participants in the company’s U.S. plans incorporates future mortality improvements from tables published by the SOA. The company reviewed the new SOA mortality and mortality improvement tables and utilized an actuary to conduct a study based on the company’s plan participants. The company determined that the best representation of the plans' mortality is to utilize the new SOA mortality and mortality improvement tables as the reference table for credibility-weighted mortality rates, blended with company specific mortality based on the study conducted by the actuary. The company's defined benefit pension plan in the United Kingdom was amended to cease the accrual of future benefits for all of its active plan participants. Subsequent to the freeze date, the company began making contributions to its defined contribution savings plan on behalf of the affected employees. The amount of the savings plan contribution is based on a percentage of the employees’ pay. These changes did not affect then-current retirees. Subsequent to the plan freeze, accumulated actuarial losses are being amortized into net periodic pension expense over the average life expectancy of inactive plan participants of approximately 25 years rather than over their remaining average service. The company's defined benefit pension plan for salaried and non-represented employees in the United States is frozen. After the plan was frozen, the company started making additional contributions to its defined contribution savings plan on behalf of the affected employees. These additional contributions have been suspended since May 2020 and are anticipated to be suspended for the foreseeable future. The amount of the savings plan contribution is based on a percentage of the employees’ pay, with the contribution percentage increasing as a function of employees’ age. These changes do not affect plan participants who had retired prior to the freeze dates or represented employees. Accumulated actuarial losses are being amortized into net periodic pension expense over the average life expectancy of inactive plan participants of approximately 16 years. The company's U.S. Retirement Plan includes an additional distribution option in the form of a lump sum benefit from the plan. The majority of plan members are eligible for this distribution option following termination or when making their retirement payment election. The lump sum benefit equals the present value of a member's vested accrued benefit paid in one lump sum payment. The company’s pension obligations are measured as of September 30, 2020, 2019 and 2018. The U.S. plans include qualified and non-qualified pension plans. The company’s only significant remaining non-U.S. plan is located in the United Kingdom. The following are the significant assumptions used in the measurement of the projected benefit obligation ("PBO") and net periodic pension expense: U.S. Plans 2020 2019 2018 Discount rate 2.50% - 2.60% 3.10% - 3.15% 4.30% Assumed return on plan assets (beginning of the year) 7.75% 7.75% 7.75% U.K. Plan 2020 2019 2018 Discount rate 1.70% 1.80% 2.90% Assumed return on plan assets (beginning of the year) 5.75% 6.00% 6.00% The discount rate is used to calculate the present value of the PBO at the balance sheet date and net periodic pension expense for the subsequent fiscal year. The rate used reflects a rate of return on high-quality fixed income investments that match the duration of expected benefit payments. Generally, the company uses a portfolio of long-term corporate AA/Aa bonds that match the duration of the expected benefit payments, except for the company's U.K. pension plan which uses an annualized yield curve, to establish the discount rate for this assumption. The assumed return on plan assets is used to determine net periodic pension expense. The rate of return assumptions are based on projected long-term market returns for the various asset classes in which the plans are invested, weighted by the target asset allocations. An incremental amount for active plan asset management and diversification, where appropriate, is included in the rate of return assumption. The return assumption is reviewed annually. The rate of compensation increase represents the long-term assumption for expected increases to salaries for pay-related plans. The accompanying disclosures include pension obligations associated with businesses classified as discontinued operations. The following table reconciles the change in the PBO, the change in plan assets and amounts included in the Consolidated Balance Sheet for the years ended September 30, 2020 and 2019, respectively (in millions): 2020 2019 U.S. Non- U.S. Total U.S. Non- U.S. Total PBO — beginning of year $ 1,006 $ 621 $ 1,627 $ 922 $ 554 $ 1,476 Interest cost 31 11 42 37 16 53 Actuarial (gain) loss 64 (24) 40 122 111 233 Prior service cost — — — — 8 8 Acquisitions — — — — 1 1 Settlements — — — — (3) (3) Benefit payments (74) (25) (99) (75) (30) (105) Foreign currency rate changes — 19 19 — (36) (36) PBO — end of year $ 1,027 $ 602 $ 1,629 $ 1,006 $ 621 $ 1,627 Change in plan assets Fair value of assets — beginning of year $ 741 $ 764 $ 1,505 $ 744 $ 702 $ 1,446 Actual return on plan assets 221 12 233 67 139 206 Employer contributions 5 — 5 5 — 5 Settlements — — — — (3) (3) Benefit payments (74) (25) (99) (75) (30) (105) Foreign currency rate changes — 25 25 — (44) (44) Fair value of assets — end of year $ 893 $ 776 $ 1,669 $ 741 $ 764 $ 1,505 Funded status - over (under) $ (134) $ 174 $ 40 $ (265) $ 143 $ (122) Amounts included in the Consolidated Balance Sheet at September 30, 2020 and 2019 are comprised of the following (in millions): 2020 2019 U.S. Non-U.S. Total U.S. Non-U.S. Total Non-current assets $ — $ 179 $ 179 $ — $ 149 $ 149 Current liabilities (5) — (5) (5) — (5) Retirement benefits-non-current (129) (5) (134) (260) (6) (266) Net amount recognized $ (134) $ 174 $ 40 $ (265) $ 143 $ (122) The following tables summarize the amounts included in AOCL net of tax related to pension liabilities as of September 30, 2020 and 2019 and changes recognized in Other Comprehensive Income (Loss) net of tax for the year ended September 30, 2020. Net Actuarial Loss U.S. Non-U.S. Total Balance at September 30, 2019 $ 467 $ 200 $ 667 Net actuarial loss for the year (101) 3 (98) Amortization for the year (26) (7) (33) Deferred tax impact 22 — 22 Balance at September 30, 2020 $ 362 $ 196 $ 558 Balance at September 30, 2018 $ 394 $ 184 $ 578 Net actuarial loss for the year 113 20 133 Amortization for the year (20) (4) (24) Deferred tax impact (20) — (20) Balance at September 30, 2019 $ 467 $ 200 $ 667 The company estimates that $31 million of net actuarial losses will be amortized from AOCL into net periodic pension expense during fiscal year 2021. The non-current portion of the pension liability is included in Retirement Benefits in the Consolidated Balance Sheet as follows (in millions): September 30, 2020 2019 Pension liability $ 134 $ 266 Retiree medical liability — long term (see Note 19) 46 56 Other 16 14 Total retirement benefits $ 196 $ 336 In accordance with FASB guidance, the PBO, accumulated benefit obligation ("ABO") and fair value of plan assets are required to be disclosed for all plans where the ABO is in excess of plan assets. The difference between the PBO and ABO is that the PBO includes projected compensation increases. Additional information is as follows (in millions): 2020 2019 ABO Assets Total ABO Assets Total PBO $ 1,032 $ 597 $ 1,629 $ 1,012 $ 615 $ 1,627 ABO 1,032 597 1,629 1,012 615 1,627 Plan Assets 893 776 1,669 741 764 1,505 The components of net periodic pension expense are as follows (in millions): 2020 2019 2018 Service cost $ — $ — $ — Interest cost 42 53 54 Assumed rate of return on plan assets (97) (97) (99) Amortization of actuarial losses 33 24 29 Settlement loss — — 6 Net periodic pension income $ (22) $ (20) $ (10) Disclosures on investment policies and strategies, categories of plan assets, fair value measurements of plan assets, and significant concentrations of risk are included below. Investment Policy and Strategy The company’s primary investment objective for its pension plan assets is to generate a total investment return sufficient to meet present and future benefit payments while minimizing the company’s cash contributions over the life of the plans. In order to accomplish this objective, the company maintains target allocations to identify and manage exposures. The target asset allocation ranges for the U.S. plans are 20–50 percent equity investments, 30–60 percent fixed income investments and 10–25 percent alternative investments. Alternative investments include private equities, real estate, hedge funds, diversified growth funds, and partnership interests. The target asset allocation ranges for the non-U.S. plans are 20–35 percent equity investments, 30–40 percent fixed income investments, 0–15 percent real estate and 15–35 percent alternative investments. Investment strategies and policies for the company’s pension plan assets reflect a balance of risk-reducing and return-seeking considerations. The objective of minimizing the volatility of assets relative to liabilities is addressed primarily through asset diversification. Assets are broadly diversified across several asset classes to achieve risk-adjusted returns that accomplish this objective. The majority of pension plan assets are externally managed through active managers. Managers are only permitted to invest within established asset classes and follow the strategies for which they have been appointed. The company uses investment guidelines and reviews asset returns and investment decisions made by the managers to ensure that they are in accordance with the company’s strategies. Concentration of Risk The company seeks to mitigate risks relative to performance of the plan assets. Assets are invested in various classes with different risk and return characteristics in order to ensure that they are sufficient to pay benefits. The company’s investment strategies incorporate a return-seeking approach through equity and alternative investments, while seeking to minimize the volatility of the plans’ assets relative to its liabilities through investments in fixed income securities. The significant areas of risk related to these strategies include equity, interest rate, and operating risk. A portion of plan assets is allocated to equity and alternative investments that are expected, over time, to earn higher returns. Within this return-seeking portfolio, asset diversification is utilized to reduce uncompensated risk. Plan assets are also allocated to fixed income investments, which seek to minimize interest rate risk volatility relative to pension liabilities. The fixed income portfolio partially matches the long-dated nature of the pension liabilities reducing interest rate risk. Interest rate decreases generally increase the value of fixed income assets, partially offsetting the related increase in the liabilities, while interest rate increases generally result in a decline in the value of fixed income assets while reducing the present value of the liabilities. Operating risks consist of the risks of inadequate diversification and weak controls. The company has established policies and procedures in order to mitigate this risk by monitoring investment manager performance, reviewing periodic compliance information, and ensuring that the plans’ managers invest in accordance with the company’s investment strategies. Fair Value of Investments The current FASB guidance provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below: • Level 1 inputs use quoted prices in active markets for identical assets that the Plan has the ability to access. • Level 2 inputs use other inputs that are observable, either directly or indirectly. These Level 2 inputs include quoted prices for similar assets in active markets and other inputs such as interest rates and yield curves that are observable at commonly quoted intervals. • Level 3 inputs are unobservable inputs, including inputs that are available in situations where there is little, if any, market activity for the related asset. In instances where inputs used to measure fair value fall into different levels in the above fair value hierarchy, fair value measurements in their entirety are categorized based on the lowest priority level input that is significant to the valuation. The company's assessment of the significance of particular inputs to these fair value measurements requires judgment and considers factors specific to each asset or liability. Following are descriptions, valuation methodologies and other information related to plan assets. Cash and cash equivalents : The fair value of cash and cash equivalents is valued at cost. Equity Securities : The overall equity category includes common and preferred stocks issued by U.S. and international companies as well as equity funds that invest in these instruments. All investments generally allow near-term (within 90 days of the measurement date) liquidity and are held in issues that are actively traded to facilitate transactions at minimum cost. The aggregate equity portfolio is diversified to avoid exposure to any investment strategy, single economic sector, industry group, or individual security. The fair value of equity securities is determined by either direct or indirect quoted market prices. When the value of assets held in separate accounts is not published, the value is based on the underlying holdings, which are primarily direct quoted market prices on regulated financial exchanges. Most of the equity investments allow daily redemptions, with some requiring a 30-60 day notice. Fixed Income Securities : The overall fixed income category includes U.S. dollar-denominated and international marketable bonds and convertible debt securities as well as fixed income funds that invest in these instruments. All assets generally allow near-term liquidity and are held in issues which are actively traded to facilitate transactions at minimum cost. The aggregate fixed income portfolio is diversified to avoid exposure to any investment strategy, maturity, issuer or credit quality. The fair value of fixed income securities is determined by either direct or indirect quoted market prices. When the value of assets held in separate accounts is not published, the value is based on the underlying holdings, which are primarily direct quoted market prices on regulated financial exchanges. U.S. fixed income securities typically offer daily liquidity, with only one investment allowing quarterly redemptions. International and emerging fixed income investment vehicles generally provide daily liquidity. Commingled Funds : The fair value of commingled funds is determined by a custodian. The custodian obtains valuations from underlying fund managers based on market quotes for the most liquid assets and alternative methods for assets that do not have sufficient trading activity to derive prices. The company and custodian review the methods used by the underlying managers to value the assets. Real Estate : Real estate provides an indirect investment into a diversified and multi-sector portfolio of property assets. The fair value of real estate investments is valued by the fund managers. The fund managers value the real estate investments via independent third-party appraisals on a periodic basis. Assumptions used to revalue the properties are updated every quarter. For the component of the real estate portfolio under development, the investments are carried at cost, which approximates fair value, until they are completed and valued by a third-party appraiser. Due to the long-term nature of real estate investments, liquidity is provided on a quarterly basis. Insurance Contract : The plan entered into a pensioner buy-in insurance contract which reimburses the plan for specified benefit payment streams. The valuation for the buy-in contract is calculated on an insurer pricing basis and is estimated using observable inputs, by adjusting the premium paid for cash flows and movements in gilt yields during the reporting period. Futures Contracts : The plan enters into futures contracts in the normal course of its investing activities to manage market risk and to achieve overall investment portfolio objectives. The credit risk associated with these contracts is minimal as they are traded on organized exchanges and settled daily. The fair value of futures contracts is determined by direct quoted market prices. Cash margin for these futures contracts is included in Cash and Cash Equivalents in the leveling table. Alternatives/Partnerships/Private Equity : This category includes investments in private equity and hedge funds in addition to entering into futures contracts across various asset classes. Such investments may be made directly or through pooled funds, including fund of funds structures. The fair market value of the company’s interest in partnerships and private equity is valued by the fund managers. The valuation is based on the net present value of observable inputs (dividends, cash flows, earnings, etc.), which are discounted at applicable discount rates. The company and custodian review the methods used by the underlying managers to value the assets. Most of these investments offer quarterly redemption opportunities while some offer daily liquidity. Some partnerships and private equity investments, due to the nature of their investment strategy and underlying holdings, offer less frequent liquidity. When available, liquidity events are closely evaluated. The valuation methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the company believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date. The fair value of plan assets at September 30, 2020 by asset category is as follows (in millions): U.S. Plans 2020 Asset Category Level 1 Level 2 Level 3 Total Equity investments U.S. – Large cap $ 209 $ — $ — $ 209 U.S. – Small cap 15 — — 15 International equity 12 — — 12 Equity investments measured at net asset value (1) — — — 189 Total equity investments $ 236 $ — $ — $ 425 Fixed income investments U.S. fixed income $ 9 $ 270 $ — $ 279 Emerging fixed income — 13 — 13 Partnerships fixed income — — — — Fixed income investments measured at net asset value (1) — — — 26 Total fixed income $ 9 $ 283 $ — $ 318 Alternatives 9 — — 9 Alternatives – Partnerships — — 5 5 Alternatives – Partnerships measured at net asset value (1) — — — 74 Cash and cash equivalents — 62 — 62 Total assets at fair value $ 254 $ 345 $ 5 $ 893 Non-U.S. Plans 2020 Asset Category Level 1 Level 2 Level 3 Total Equity investments International equity $ 180 $ — $ — $ 180 Total equity investments $ 180 $ — $ — $ 180 Fixed income investments Other fixed income investments $ 5 $ 214 $ — $ 219 Fixed income investments measured at net asset value (1) — — — 71 Total fixed income $ 5 $ 214 $ — $ 290 Commingled funds — 2 — 2 Alternative investments measured at net asset value (1) — — — 127 Real estate measured at net asset value (1) — — — 37 Cash and cash equivalents — 9 — 9 Insurance contract — 131 — 131 Total assets at fair value $ 185 $ 356 $ — $ 776 (1) In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. The fair value of plan assets at September 30, 2019 by asset category is as follows (in millions): U.S. Plans 2019 Asset Category Level 1 Level 2 Level 3 Total Equity investments U.S. – Large cap $ 38 $ — $ — $ 38 U.S. – Small cap 15 — — 15 Private equity — — 19 19 International equity 21 — — 21 Equity investments measured at net asset value (1) — — — 154 Total equity investments $ 74 $ — $ 19 $ 247 Fixed income investments U.S. fixed income $ 3 $ 233 $ — $ 236 Emerging fixed income — 16 — 16 Partnerships fixed income 12 — — 12 Fixed income investments measured at net asset value (1) — — — 27 Total fixed income $ 15 $ 249 $ — $ 291 Alternatives – Partnerships — — 86 86 Alternatives – Partnerships measured at net asset value (1) — — — 78 Cash and cash equivalents — 39 — 39 Total assets at fair value $ 89 $ 288 $ 105 $ 741 Non-U.S. Plans 2019 Asset Category Level 1 Level 2 Level 3 Total Equity investments International equity $ 170 $ — $ — $ 170 Total equity investments $ 170 $ — $ — $ 170 Fixed income investments Other fixed income investments $ 6 $ 222 $ — $ 228 Fixed income investments measured at net asset value (1) — — — 189 Total fixed income $ 6 $ 222 $ — $ 417 Commingled funds — 3 — 3 Alternative investments measured at net asset value (1) — — — 124 Real estate measured at net asset value (1) — — — 38 Cash and cash equivalents — 12 — 12 Total assets at fair value $ 176 $ 237 $ — $ 764 (1) In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. Unfunded Commitment As of September 30, 2020, the U.S. plan had $1 million of unfunded investment commitments related to plan assets. The majority of this amount is attributed to partnership investments that the plan will invest in gradually over the course of several years. Non-U.S. plans currently do not have any unfunded commitments. The following table summarizes the changes in Level 3 pension plan assets measured at fair value on a recurring basis for the year ended September 30, 2020 (in millions): U.S. Plans 2020 Fair Value at October 1, 2019 Return on Plan Assets: Attributable to Assets Held at September 30, 2020 Purchases Settlements Net Transfers Into (Out of) Level 3 Fair Value at September 30, 2020 Asset Category Private equity $ 19 $ — $ — $ — $ (19) $ — Alternatives – Partnerships 86 1 — (1) (81) 5 Total Level 3 fair value $ 105 $ 1 $ — $ (1) $ (100) $ 5 The following table summarizes the changes in Level 3 pension plan assets measured at fair value on a recurring basis for the year ended September 30, 2019 (in millions): U.S. Plans 2019 Fair Value at October 1, 2018 Return on Plan Assets: Attributable to Assets Held at September 30, 2019 Purchases Settlements Net Transfers Into (Out of) Level 3 Fair Value at September 30, 2019 Asset Category Private equity $ 17 $ 2 $ — $ — $ — $ 19 Alternatives – Partnerships 83 4 — (1) — 86 Total Level 3 fair value $ 100 $ 6 $ — $ (1) $ — $ 105 Information about the expected cash flows for the U.S. and non-U.S. pension plans is as follows (in millions): U.S. Non U.S. Total Expected employer contributions: Fiscal 2021 $ 5 $ 1 $ 6 Expected benefit payments: Fiscal 2021 70 25 95 Fiscal 2022 70 25 95 Fiscal 2023 68 25 93 Fiscal 2024 67 25 92 Fiscal 2025 66 25 91 Fiscal 2026-2030 302 124 426
Schedule Of US Pension Liability Expense Assumptions	The following are the significant assumptions used in the measurement of the projected benefit obligation ("PBO") and net periodic pension expense: U.S. Plans 2020 2019 2018 Discount rate 2.50% - 2.60% 3.10% - 3.15% 4.30% Assumed return on plan assets (beginning of the year) 7.75% 7.75% 7.75%

INCOME TAXES

INCOME TAXES	12 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The income tax provisions were calculated based upon the following components of income before income taxes (in millions): 2020 2019 2018 U.S. income $ 268 $ 194 $ 85 Foreign income 58 183 193 Total $ 326 $ 377 $ 278 The components of the provision (benefit) for income taxes are summarized as follows (in millions): 2020 2019 2018 Current tax expense: U.S. $ 20 $ 1 $ 24 Foreign 16 40 51 State and local 4 1 — Total current tax expense 40 42 75 Deferred tax expense (benefit): U.S. 40 34 76 Foreign (5) 6 (5) State and local 3 — 3 Total deferred tax expense 38 40 74 Income tax expense $ 78 $ 82 $ 149 The deferred tax expense or benefit represents tax effects of current year deductions or items of income that will be recognized in future periods for tax purposes. The fiscal year 2018 deferred income tax expense in the U.S. was primarily attributable to the revaluation of deferred tax assets for the new effective tax rate and the utilization of the foreign tax credit related to the transition tax. Net deferred income tax assets (liabilities) included in the Consolidated Balance Sheet consist of the tax effects of temporary differences related to the following (in millions): September 30, 2020 2019 Accrued compensation and benefits $ 13 $ 19 Accrued product warranties 11 11 Inventory costs 12 7 Receivables 8 8 Asbestos and environmental 5 8 Accrued retiree healthcare benefits 13 16 Retirement pension plans 25 59 Property 9 7 Lease liabilities 18 — Loss and credit carryforwards 215 230 Other 16 18 Sub-total 345 383 Less: Valuation allowances (226) (207) Deferred income taxes - asset $ 119 $ 176 Taxes on undistributed income $ (11) $ (10) Intangible assets (65) (51) Lease assets (17) — Debt basis difference (7) (8) Deferred income taxes - liability $ (100) $ (69) Net deferred income tax assets $ 19 $ 107 Net deferred income tax assets (liabilities) are included in the Consolidated Balance Sheet as follows (in millions): September 30, 2020 2019 Other assets (see Note 11) $ 30 $ 122 Other liabilities (see Note 14) (11) (15) Net deferred income taxes — asset $ 19 $ 107 Valuation Allowances In prior years, the company established valuation allowances against the net deferred tax assets of its 100%-owned subsidiaries in France, Germany, Brazil, the U.K. and certain other countries. In evaluating its ability to recover these net deferred tax assets, the company utilizes a consistent approach which considers its historical operating results, including an assessment of the degree to which any gains or losses are driven by items that are unusual in nature and tax planning strategies. In addition, the company reviews changes in near-term market conditions and other factors that impact future operating results. As of September 30, 2020, the company continues to maintain the valuation allowances in France, Germany, the U.K. and certain other jurisdictions, as the company believes the negative evidence continues to outweigh the positive evidence that it will be able to recover these net deferred tax assets. If, in the future, the company generates taxable income on a sustained basis, its conclusion regarding the need for valuation allowances in these jurisdictions could change. The expiration periods for deferred tax assets related to net operating losses and tax credit carryforwards as of September 30, 2020 are included below (in millions). Also included are the associated valuation allowances on these deferred tax assets (in millions). Fiscal Year Expiration Periods 2021-2025 2026-2035 2036-2040 Indefinite Total Net Operating Losses and Tax Credit Carryforwards $ 7 $ 15 $ — $ 193 $ 215 Valuation Allowances on these Deferred Tax Assets $ 6 $ 13 $ — $ 188 $ 207 Realization of deferred tax assets representing net operating loss and tax credit carryforwards for which a valuation allowance has not been provided is dependent on generating sufficient taxable income prior to expiration of the loss carryforwards. Although realization is not assured, management believes it is more likely than not that such deferred tax assets will be realized. The amount of the deferred tax assets considered realizable, however, could be reduced in the near term if the company is unable to generate sufficient future taxable income during the carryforward period. The company’s provision (benefit) for income taxes was different from the provision for income taxes calculated at the U.S. statutory rate for the reasons set forth below (in millions): 2020 2019 2018 Expense for income taxes at statutory tax rate $ 68 $ 79 $ 68 State and local income taxes 5 3 2 Foreign income taxed at rates other than statutory 2 11 4 Legislative changes (10) 1 126 Joint venture equity income (3) (6) (6) U.S. tax impact on non-U.S. earnings — — 4 Nondeductible expenses 11 16 8 Tax credits (8) (11) (9) Valuation allowances 10 (7) (40) Tax audit adjustments 5 — — Other (2) (4) (8) Income tax expense $ 78 $ 82 $ 149 On December 22, 2017, the U.S. government enacted the U.S. tax reform. The U.S. tax reform made broad and complex changes to the U.S. tax code that affected the company's fiscal year ended September 30, 2018, including, but not limited to, reducing the U.S. federal corporate tax rate from 35 percent to 21 percent and requiring a one-time transition tax on deemed repatriated earnings of foreign subsidiaries. Staff Accounting Bulletin ("SAB") 118, which provides guidance on accounting for the tax effects of the U.S. tax reform, provides a measurement period that should not extend beyond one year from the U.S. tax reform enactment date for companies to complete the accounting under ASC 740. The company completed its accounting for the enactment date income tax effects of U.S. tax reform as of December 31, 2018. As reflected in the company's fiscal year 2019 Consolidated Financial Statements, the results of this accounting were a reduction to the estimated tax expense at September 30, 2018 from $89 million to $87 million for the refinement of the U.S. tax reform items. At September 30, 2020 and 2019, $1,161 million and $1,163 million, respectively, of non-U.S. earnings were considered indefinitely reinvested in operations outside the U.S., for which deferred taxes have not been provided. Quantification of the deferred tax liability, if any, associated with permanently reinvested earnings is not practicable. Additionally, the company has accounted for the tax impacts related to the Global Intangible Low Tax Income ("GILTI"), Base Erosion Anti Abuse Tax ("BEAT") and Foreign Derived Intangible Income ("FDII") regimes as well as all other provisions of the U.S. tax reform that are effective in fiscal year 2020. The company has elected to treat GILTI as a period cost and, therefore, has not recognized deferred taxes for basis differences that may reverse as GILTI tax in future periods. The total amount of gross unrecognized tax benefits the company recorded in accordance with ASC Topic 740 as of September 30, 2020 was $283 million, of which $234 million represents the amount that, if recognized, would favorably affect the effective income tax rate in future periods. A reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period is as follows (in millions): 2020 2019 2018 Balance at beginning of the period $ 276 $ 261 $ 269 Additions to tax positions recorded during the current year 4 11 — Additions to tax positions recorded during the prior year 5 9 — Reductions to tax position recorded in prior years (1) — (6) Reductions to tax positions due to lapse of statutory limits (4) (4) (1) Translation, other 3 (1) (1) Balance at end of the period $ 283 $ 276 $ 261 The company’s continuing practice is to recognize interest and penalties on uncertain tax positions in the provision for income taxes in the Consolidated Statement of Operations. At September 30, 2020 and 2019, the company recorded assets of $13 million and $12 million, respectively, of interest on uncertain tax positions in the Consolidated Balance Sheet. In addition, penalties of $2 million a nd $1 million were recorded as of September 30, 2020 and 2019, respectively. The income tax benefit related to interest was $1 million, for the fiscal years ended September 30, 2020 and 2019. The income tax benefit related to interest was $4 million for the fiscal year ended September 30, 2018. The income tax expense related to penalties was $1 million for fiscal year ended September 30, 2020. The income tax expense related to penalties was immaterial for fiscal years ended September 30, 2019 and 2018. The company files tax returns in multiple jurisdictions and is subject to examination by taxing authorities throughout the world. The company’s Canadian federal income tax returns for fiscal years 2015 and 2016 are currently under audit. The company's Indian subsidiary is currently under audit for fiscal years 2015 and 2016. The company's U.K. subsidiaries are under audit for fiscal years 2015 and 2016. In addition, the company is under audit in various state tax jurisdictions for various years. It is reasonably possible that audit settlements, the conclusion of current examinations or the expiration of the statute of limitations in several jurisdictions could change the company’s unrecognized tax benefits during the next twelve months. It is not possible to reasonably estimate the expected change to the total amount of unrecognized tax benefit in the next twelve months. In addition to the audits listed above, the company has open tax years primarily from 2001-2019 with various significant taxing jurisdictions, including the U.S., Brazil, Canada, China, Italy, Mexico, Sweden and the U.K. These open years contain matters that could be subject to differing interpretations of applicable tax laws and regulations as they relate to the amount, timing or inclusion of revenue and expenses or the sustainability of income tax credits for a given audit cycle. The company has recorded a tax benefit only for those positions that meet the more-likely-than-not standard. On March 27, 2020, the Coronavirus Aid, Relief and Economic Security Act, which includes various income and payroll tax provisions, was signed into law by the U.S. government. In addition, various other coronavirus tax relief initiatives have been implemented around the world. These tax initiatives did not have a material impact on the Consolidated Financial Statements for the fiscal year ended September 30, 2020.

CONTINGENCIES

CONTINGENCIES	12 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
CONTINGENCIES	CONTINGENCIES Environmental Federal, state and local requirements relating to the discharge of substances into the environment, the disposal of hazardous wastes and other activities affecting the environment have, and will continue to have, an impact on the operations of the company. The process of estimating environmental liabilities is complex and dependent upon evolving physical and scientific data at the sites, uncertainties as to remedies and technologies to be used and the outcome of discussions with regulatory agencies. The company records liabilities for environmental issues in the accounting period in which they are considered to be probable and the cost can be reasonably estimated. At environmental sites in which more than one potentially responsible party has been identified, the company records a liability for its allocable share of costs related to its involvement with the site, as well as an allocable share of costs related to insolvent parties or unidentified shares. At environmental sites at which the company is the only potentially responsible party, the company records a liability for the total probable and estimable costs of remediation before consideration of recovery from insurers or other third parties. The company has been designated as a potentially responsible party at ten Superfund sites, excluding sites as to which the company’s records disclose no involvement or as to which the company’s liability has been finally determined. Management estimates the total reasonably possible costs the company could incur for the remediation of Superfund sites at September 30, 2020 to be approximately $24 million, of which $11 million is probable and recorded as a liability. Included in reasonably possible amounts are estimates for certain remediation actions that may be required if current actions are deemed inadequate by the regulators. Environmental remediation costs recorded with respect to the Superfund sites were $4 million in fiscal year 2020, $2 million in fiscal year 2019 and $12 million in fiscal year 2018. In addition to the Superfund sites, various other lawsuits, claims and proceedings have been asserted against the company, alleging violations of federal, state and local environmental protection requirements, or seeking remediation of alleged environmental impairments, principally at previously disposed-of properties. For these matters, management has estimated the total reasonably possible costs the company could incur at September 30, 2020 to be approximately $14 million, of which $5 million is probable and recorded as a liability. During each of fiscal years 2020, 2019 and 2018, the company recorded environmental remediation costs of $2 million with respect to these matters, resulting from revised estimates to remediate these sites. Included in the company’s environmental liabilities are costs for on-going operation, maintenance and monitoring at environmental sites in which remediation has been put into place. This liability is discounted using discount rates in the range of 1.50 to 2.25 percent and is approximately $13 million at September 30, 2020. The undiscounted estimate of these costs is approximately $15 million. The following are the components of the Superfund and non-Superfund environmental reserves (in millions): Superfund Non-Superfund Total Balance at September 30, 2019 $ 11 $ 4 $ 15 Payments and other (4) (1) (5) Accruals 4 2 6 Balance at September 30, 2020 $ 11 $ 5 $ 16 There were $6 million, $3 million, and $12 million of environmental remediation costs recognized in other operating expense in the Consolidated Statement of Operations in fiscal years 2020, 2019 and 2018, respectively. Environmental reserves are included in Other Current Liabilitie s (see Note 13) and Other Liabilities (see Note 14 ) in the Consolidated Balance Sheet. The actual amount of costs or damages for which the company may be held responsible could materially exceed the foregoing estimates because of uncertainties, including the financial condition of other potentially responsible parties, the success of the remediation, discovery of new contamination and other factors that make it difficult to predict actual costs accurately. However, based on management’s assessment, after consulting with outside advisors that specialize in environmental matters, and subject to the difficulties inherent in estimating these future costs, the company believes that its expenditures for environmental capital investment and remediation necessary to comply with present regulations governing environmental protection and other expenditures for the resolution of environmental claims will not have a material effect on the company’s business, financial condition or results of operations. In addition, in future periods, new laws and regulations, changes in remediation plans, advances in technology and additional information about the ultimate clean-up remedies could significantly change the company’s estimates. Management cannot assess the possible effect of compliance with future requirements. In April 2016, the company was served with several complaints filed against the company and other defendants in the United States District Court for the Northern District of Mississippi. The complaints were amended in July 2016. These complaints allege damages, including diminution of property value, concealment/fraud and emotional distress resulting from alleged environmental pollution in and around a neighborhood in Grenada, Mississippi. Rockwell owned and operated a facility near the neighborhood from 1965 to 1985. The company filed answers to the complaints in July 2016. In May 2017, the company was served with a complaint filed against the company and other defendants by the Mississippi Attorney General in the Chancery Court of Grenada County, Mississippi. The complaint alleged that operations at the above-referenced Grenada facility caused contamination of off-site groundwater and surface waters. Subsequently, the company removed this action to the United States District Court for the Northern District of Mississippi. However, plaintiffs’ motion to remand the case to the Chancery Court was granted in March 2018. In April, May and July 2018, the company was served with additional property damage, personal injury and wrongful death lawsuits naming the company and others as defendants, which were brought by current and former residents of the same neighborhood. The company has reached settlements with some, but not all of the plaintiffs, and continues to vigorously defend itself while continuing settlement discussions in the unresolved matters. The company recorded an accrual in the second quarter of fiscal year 2019. Asbestos Maremont Corporation ("Maremont"), a subsidiary of Meritor, manufactured friction products containing asbestos from 1953 through 1977, when it sold its friction product business. Arvin Industries, Inc., a predecessor of the company, acquired Maremont in 1986. In the first quarter of fiscal year 2019, Maremont and its three wholly-owned subsidiaries, Maremont Exhaust Products, Inc., AVM, Inc., and Former Ride Control Operating Company, Inc., began to solicit votes from asbestos claimants in favor of a Joint Pre-Packaged Plan of Reorganization (the "Plan"). On January 18, 2019, the Plan was approved by voting asbestos claimants and, on January 22, 2019, Maremont and its subsidiaries voluntarily filed cases under Chapter 11 of the U.S. Bankruptcy Code in the U.S. Bankruptcy Court for the District of Delaware (the "Bankruptcy Court") seeking to implement the Plan through the Chapter 11 cases. Among other things, the Plan was intended to permanently resolve all current and future asbestos claims related to Maremont's historical asbestos-related activities through the creation of a trust pursuant to Section 524(g) of the U.S. Bankruptcy Code (the "524(g) Trust"). Meritor determined that the net amount of $51 million Maremont would be required to contribute to the 524(g) Trust according to the Plan represented Meritor's best estimate of Maremont's net asbestos liability. As a result, Meritor recognized $31 million of income related to remeasuring the Maremont net asbestos liability based on the terms of the Plan. As of January 22, 2019, Maremont and its subsidiaries were deconsolidated from the Consolidated Balance Sheet and the results of Maremont’s operations were eliminated from the company’s consolidated results of operations as Maremont became subject to the control of a court. Deconsolidation had an insignificant impact on the Consolidated Statement of Operations. The Plan was confirmed by the Bankruptcy Court on May 17, 2019 and approved by the United States District Court for the District of Delaware on June 27, 2019. On July 9, 2019, the company contributed $48 million, consisting of cash and repayment of a loan, to Maremont, and Maremont funded the 524(g) Trust with such cash and its other assets, including its existing insurance policies. As a result, all current and future asbestos claims related to the Maremont’s historical asbestos-related activities have been channeled to the 524(g) Trust, which will process and satisfy all such claims going forward pursuant to its resolution and payment procedures. Rockwell — ArvinMeritor, Inc. ("AM"), a predecessor of Meritor, along with many other companies, has also been named as a defendant in lawsuits alleging personal injury as a result of exposure to asbestos used in certain components of Rockwell products many years ago. Liability for these claims was transferred at the time of the spin-off of the automotive business from Rockwell in 1997. Rockwell had approximately 1,200 and 1,400 pending active asbestos claims in lawsuits that name AM as a defendant at September 30, 2020 and 2019, respectively. A significant portion of the claims do not identify any of Rockwell’s products or specify which of the claimants, if any, were exposed to asbestos attributable to Rockwell’s products, and past experience has shown that the vast majority of the claimants will likely never identify any of Rockwell’s products. Historically, AM has been dismissed from the vast majority of similar claims filed in the past with no payment to claimants. For those claimants who do show that they worked with Rockwell’s products, management nevertheless believes it has meritorious defenses, in substantial part due to the integrity of the products involved and the lack of any impairing medical condition on the part of many claimants. Pending and Future Claims : The company engaged a third-party advisor with extensive experience in assessing asbestos-related liabilities to conduct a study to estimate its potential undiscounted liability for pending and future asbestos-related claims as of September 30, 2020. On a continual basis, management monitors the underlying claims data and experience, for the purpose of assessing the appropriateness of the assumptions used to estimate the liability. As of September 30, 2020, the best estimate of the company’s obligation for asbestos-related claims over the next 38 years is $78 million. The company recognized a liability for pending and future claims of $78 million as of September 30, 2020 and $91 million as of September 30, 2019. The ultimate cost of resolving pending and future claims is estimated based on the history of claims and expenses for plaintiffs represented by law firms in jurisdictions with an established history with Rockwell. Recoveries: Rockwell has insurance coverage that management believes covers indemnity and defense costs, over and above self-insurance retentions, for a significant portion of these claims. In 2004, the company initiated litigation against certain of these carriers to enforce the insurance policies. During the fourth quarter of fiscal year 2016, the company executed settlement agreements with two of these carriers, thereby resolving the litigation against those particular carriers. Pursuant to the terms of one of those settlement agreements, in the fourth quarter of fiscal year 2016 the company received $32 million in cash from an insurer, of which $10 million was recognized as a reduction in asbestos expense, and $22 million was recorded as a liability to the insurance carrier as it is required to be returned to the carrier if additional asbestos liability is not ultimately incurred. During fiscal years 2018 and 2017, Rockwell recognized an additional $12 million and $10 million, respectively, of the cash settlement proceeds as a reduction in asbestos expense. Pursuant to the terms of a second settlement agreement, in the fourth quarter of fiscal year 2016 the company recorded a $12 million receivable to reflect expected reimbursement of future defense and indemnity payments under a coverage-in-place arrangement with that insurer. During the fourth quarter of fiscal year 2018, the company entered into a settlement agreement to resolve additional disputed coverage resulting from asbestos claims. On September 15, 2018, the company received $3 million in cash and recorded $28 million as an insurance receivable related to this settlement. The insurance receivables for Rockwell’s asbestos-related liabilities totaled $62 million and $61 million as of September 30, 2020 and 2019, respectively. The amounts recorded for the asbestos-related reserves and recoveries from insurance companies are based upon assumptions and estimates derived from currently known facts. All such estimates of liabilities and recoveries for asbestos-related claims are subject to considerable uncertainty because such liabilities and recoveries are influenced by variables that are difficult to predict. The future litigation environment for Rockwell could change significantly from its past experience, due, for example, to changes in the mix of claims filed against Rockwell in terms of plaintiffs’ law firm, jurisdiction and disease; legislative or regulatory developments; the company’s approach to defending claims; or payments to plaintiffs from other defendants. Estimated recoveries are influenced by coverage issues among insurers and the continuing solvency of various insurance companies. If the assumptions with respect to the estimation period, the nature of pending claims, the cost to resolve claims and the amount of available insurance prove to be incorrect, the actual amount of liability for Rockwell asbestos-related claims, and the effect on the company, could differ materially from current estimates and, therefore, could have a material impact on the company’s financial condition and results of operations. The Rockwell legacy asbestos-related reserves and corresponding asbestos-related recoveries are summarized as follows (in millions): September 30, 2020 2019 Pending and future claims $ 78 $ 91 Billed but unpaid claims 1 2 Asbestos-related liabilities $ 79 $ 93 Asbestos-related insurance recoveries $ 62 $ 61 Assumptions: The following assumptions were made by the company after consultation with consultants and are included in the study: • Pending and future claims were estimated for a 38 year period ending in fiscal year 2058; • The litigation environment remains consistent throughout the forecast horizon; • On a per claim basis, defense and indemnity costs for pending and future claims will be at the level consistent with the company’s recent experience. Indemnification The company has agreed to indemnify others in conjunction with certain transactions, primarily divestitures. These indemnities address a variety of matters, which may include environmental, tax, asbestos and employment-related matters, and the periods of indemnification vary in duration. The company is not aware of any other claims or other information that would give rise to material payments under such indemnities. Other

BUSINESS SEGMENT INFORMATION

BUSINESS SEGMENT INFORMATION	12 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
BUSINESS SEGMENT INFORMATION	BUSINESS SEGMENT INFORMATION The company defines its operating segments as components of its business where separate financial information is available and is evaluated regularly by the chief operating decision maker in deciding how to allocate resources and in assessing performance. The company’s Chief Operating Decision Maker ("CODM") is the Chief Executive Officer. In the third quarter of fiscal year 2020, the company realigned its operations resulting in a change to its operating and reportable segments. As of the third quarter of fiscal year 2020, the reportable segments are (1) Commercial Truck and (2) Aftermarket and Industrial. Prior year reportable segment financial results have been recast for these changes. The company has two reportable segments at September 30, 2020, as follows: • The Commercial Truck segment supplies drivetrain systems and components, including axles, drivelines and braking and suspension systems, primarily for medium- and heavy-duty trucks and other applications in North America, South America, Europe and Asia Pacific. It also supplies a variety of undercarriage products and systems for trailer applications in North America. This segment also includes the company's aftermarket businesses in Asia Pacific and South America. • The Aftermarket and Industrial segment supplies axles, brakes, drivelines, suspension parts and other replacement parts to commercial vehicle and industrial aftermarket customers, primarily in North America and Europe. In addition, this segment supplies drivetrain systems and certain components, including axles, drivelines, brakes and suspension systems for military, construction, bus and coach, fire and emergency and other applications in North America and Europe. Segment adjusted EBITDA is defined as income (loss) from continuing operations before interest expense, income taxes, depreciation and amortization, non-controlling interests in consolidated joint ventures, loss on sale of receivables, restructuring expense, asset impairment charges and other special items as determined by management. Segment adjusted EBITDA excludes unallocated legacy and corporate income (expense), net. The company uses segment adjusted EBITDA as the primary basis for the CODM to evaluate the performance of each of its reportable segments. The accounting policies of the segments are the same as those applied in the Consolidated Financial Statements, except for the use of segment adjusted EBITDA. The company may allocate certain common costs, primarily corporate functions, between the segments differently than the company would for stand alone financial information prepared in accordance with GAAP. These allocated costs include expenses for shared services such as information technology, finance, communications, legal and human resources. The company does not allocate interest expense and certain legacy and other corporate costs not directly associated with the segment. Segment information is summarized as follows (in millions): Commercial Truck Aftermarket and Industrial Elims Total Fiscal year 2020 Sales: External Sales $ 2,080 $ 964 $ — $ 3,044 Intersegment Sales 110 17 (127) — Total Sales $ 2,190 $ 981 $ (127) $ 3,044 Fiscal year 2019 Sales (1) : External Sales $ 3,307 $ 1,081 $ — $ 4,388 Intersegment Sales 149 19 (168) — Total Sales $ 3,456 $ 1,100 $ (168) $ 4,388 Fiscal year 2018 Sales (1) : External Sales $ 3,171 $ 1,007 $ — $ 4,178 Intersegment Sales 154 17 (171) — Total Sales $ 3,325 $ 1,024 $ (171) $ 4,178 (1) Fiscal years 2019 and 2018 have been recast to reflect reportable segment changes. Year Ended September 30, 2020 2019 2018 Segment adjusted EBITDA: Commercial Truck (1) $ 116 $ 342 $ 345 Aftermarket and Industrial (1) 150 175 142 Segment adjusted EBITDA 266 517 487 Unallocated legacy and corporate income (expense), net (2) 6 3 (13) Interest expense, net (66) (57) (67) Gain on sale of equity investment — — — Provision for income taxes (78) (82) (149) Depreciation and amortization (101) (87) (84) Loss on sale of receivables (4) (6) (5) Restructuring costs (27) (8) (6) Transaction costs (5) (6) — Asbestos related items (3) — 31 (25) Pension settlement loss (4) — — (6) Asset impairment charges (8) (10) (3) Income from WABCO distribution termination 265 — — Noncontrolling interests (4) (5) (9) Income from continuing operations attributable to Meritor, Inc. $ 244 $ 290 $ 120 (1) Fiscal years 2019 and 2018 have been rec ast to reflect reportable segment changes. (2) Unallocated legacy and corporate income (expense), net represents items that are not directly related to the company's business segments. These items primarily include asbestos-related charges and settlements, pension and retiree medical costs associated with sold businesses, and other legacy costs for environmental and product liability. (3) The year ended September 30, 2019 includes $31 million related to the remeasurement of the Maremont net asbestos liability based on the Plan. The year ended September 30, 2018 includes $25 million related to the change in estimate resulting from change in estimated forecast horizon and an asbestos insurance settlement. (4) The year ended September 30, 2018 includes $6 million related to the U.K. pension settlement loss. Year ended September 30, 2020 2019 (1) 2018 (1) Depreciation and Amortization: Commercial Truck $ 76 $ 73 $ 72 Aftermarket and Industrial 25 14 12 Total depreciation and amortization $ 101 $ 87 $ 84 Capital Expenditures: Commercial Truck $ 68 $ 88 $ 88 Aftermarket and Industrial 17 15 16 Total capital expenditures $ 85 $ 103 $ 104 September 30, 2020 2019 (2) Segment Assets: Commercial Truck $ 1,666 $ 1,745 Aftermarket and Industrial 658 729 Total segment assets 2,324 2,474 Corporate (3) 714 567 Less: Accounts receivable sold under off-balance sheet factoring programs (4) (154) (226) Total assets $ 2,884 $ 2,815 (1) Fiscal years 2019 and 2018 have been recast to reflect reportable segment changes. (2) Amounts as of September 30, 2019 have been recast to reflect reportable segment changes, including the reallocation of goodwill. (3) Corporate assets consist primarily of cash, deferred income taxes and prepaid pension costs. (4) At September 30, 2020 and September 30, 2019, segments assets include $154 million and $226 million, respectively, of accounts receivable sold under off-balance sheet accounts receivable factoring programs (see Note 8). These sold receivables are included in segment assets as the CODM reviews segment assets inclusive of these balances. Sales by geographic area are based on the location of the selling unit. Information on the company’s geographic areas is summarized as follows (in millions): Year ended September 30, 2020 2019 2018 Sales by Geographic Area: U.S. $ 1,783 $ 2,622 $ 2,289 Canada 54 69 72 Mexico 147 249 221 Total North America 1,984 2,940 2,582 Sweden 202 276 311 Italy 166 234 243 United Kingdom 114 165 179 Other Europe 139 91 103 Total Europe 621 766 836 Brazil 172 248 224 China 135 153 196 India 72 197 231 Other Asia-Pacific 60 84 109 Total sales $ 3,044 $ 4,388 $ 4,178 September 30, 2020 2019 Assets by Geographic Area: U.S. $ 1,458 $ 1,504 Canada 35 39 Mexico 190 197 Total North America 1,683 1,740 Sweden 136 130 Italy 111 81 United Kingdom 270 241 Other Europe 269 173 Total Europe 786 625 Brazil 132 187 China 130 124 India 76 84 Other Asia-Pacific 77 55 Total $ 2,884 $ 2,815 Sales to AB Volvo represented approximately 21 percent, 22 percent and 23 percent of the company’s sales in fiscal years 2020, 2019 and 2018, respectively. Sales to Daimler AG represented approximately 17 percent, 19 percent and 17 percent of the company’s sales in fiscal years 2020, 2019 and 2018, respectively. Sales to PACCAR represented approximately 12 percent, 13 percent and 12 percent of the company's sales in fiscal years 2020, 2019 and 2018, respectively. Sales to Navistar represented approximately 8 percent, 10 percent and 9 percent of the company’s sales in fiscal years 2020, 2019 and 2018, respectively. No other customer comprised 10 percent or more of the company’s total sales in any of the three fiscal years ended September 30, 2020.

QUARTERLY FINANCIAL INFORMATION

QUARTERLY FINANCIAL INFORMATION (UNAUDITED)	12 Months Ended
	Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract]
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)	QUARTERLY FINANCIAL INFORMATION (UNAUDITED) The following is a condensed summary of the company’s unaudited quarterly results of continuing operations for fiscal years 2020 and 2019. Per share amounts are based on the weighted average shares outstanding for that quarter. Earnings per share for the year may not equal the sum of the four fiscal quarters’ earnings per share due to changes in basic and diluted shares outstanding. 2020 Fiscal Quarters (Unaudited) First Second Third Fourth 2020 (In millions, except share related data) Sales $ 901 $ 871 $ 514 $ 758 $ 3,044 Cost of sales (774) (757) (486) (699) (2,716) Gross margin 127 114 28 59 328 Benefit (provision) for income taxes (13) (73) 13 (5) (78) Net income (loss) 41 242 (34) — 249 Net income (loss) from continuing operations attributable to Meritor, Inc. 39 240 (36) 1 244 Net income (loss) attributable to Meritor, Inc. 39 241 (36) 1 245 Basic earnings (loss) per share from continuing operations $ 0.50 $ 3.27 $ (0.50) $ 0.01 $ 3.30 Diluted earnings (loss) per share from continuing operations $ 0.48 $ 3.19 $ (0.50) $ 0.01 $ 3.23 The company recognized restructuring income and costs in its continuing operations during fiscal year 2020 as follows: $5 million of costs in the first quarter, $10 million of costs in the second quarter, $12 million of costs in the third quarter and an insignificant amount in the fourth quarter (see Note 7). In the second quarter of fiscal year 2020, the company exercised the option to terminate its aftermarket distribution arrangement with WABCO and received $265 million from WABCO in connection with the termination of the arrangement (see Note 3). 2019 Fiscal Quarters (Unaudited) First Second Third Fourth 2019 (In millions, except share related data) Sales $ 1,038 $ 1,156 $ 1,166 $ 1,028 $ 4,388 Cost of sales (897) (982) (987) (882) (3,748) Gross margin 141 174 179 146 640 Provision for income taxes (21) (27) (21) (13) (82) Net income 92 74 89 41 296 Net income from continuing operations attributable to Meritor, Inc. 90 73 85 42 290 Net income attributable to Meritor, Inc. 90 72 86 43 291 Basic earnings per share from continuing operations $ 1.06 $ 0.88 $ 1.02 $ 0.51 $ 3.49 Diluted earnings per share from continuing operations $ 1.03 $ 0.85 $ 0.99 $ 0.50 $ 3.36 The company recognized restructuring income and costs in its continuing operations during fiscal year 2019 as follows: an insignificant amount in the first quarter, $1 million of income in the second quarter, $1 million of income in the third quarter and $10 million of restructuring costs in the fourth quarter (see Note 7). During the first quarter of fiscal year 2019 a $31 million adjustment was made relating to the remeasurement of the Maremont asbestos liability based on the Plan. The year ended September 30, 2019 includes $12 million of non-cash tax benefit related to the one-time deemed repatriation of accumulated foreign earnings and a one-time net charge of $9 million recorded for an election made that will allow for a future tax-free repatriation of cash to the United States.

OPERATING CASH FLOWS AND OTHER

OPERATING CASH FLOWS AND OTHER SUPPLEMENTAL FINANCIAL INFORMATION	12 Months Ended
	Sep. 30, 2020
Operating Cash Flow Disclosure [Abstract]
OPERATING CASH FLOWS AND OTHER SUPPLEMENTAL FINANCIAL INFORMATION	OPERATING CASH FLOWS AND OTHER SUPPLEMENTAL FINANCIAL INFORMATION Year Ended September 30, 2020 2019 2018 (in millions) OPERATING ACTIVITIES Net income $ 249 $ 296 $ 126 Less: Income (loss) from discontinued operations, net of tax 1 1 (3) Income from continuing operations 248 295 129 Adjustments to income from continuing operations to arrive at cash provided by operating activities: Depreciation and amortization 101 87 84 Deferred income tax expense 38 40 74 Restructuring costs 27 8 6 Loss on debt extinguishment — — 8 Asset impairment 8 10 3 Equity in earnings of affiliates (14) (31) (27) Stock compensation expense 7 18 20 Provision for doubtful accounts — — (1) Pension and retiree medical income (42) (37) (31) Pension settlement loss — — 6 Asbestos related liability remeasurement — (31) — Contribution to Maremont trust — (48) — Dividends received from equity method investments 10 23 17 Pension and retiree medical contributions (15) (16) (21) Restructuring payments (25) (5) (8) Changes in off-balance sheet receivable securitization and factoring programs (77) (18) 11 Changes in assets and liabilities, excluding effects of acquisitions, divestitures, foreign currency adjustments and discontinued operations: Receivables 147 80 (98) Inventories 100 9 (112) Accounts payable (186) (103) 97 Other current assets and liabilities (64) (3) 36 Other assets and liabilities 2 (22) 59 Operating cash flows provided by continuing operations 265 256 252 Operating cash flows used for discontinued operations — — (1) CASH PROVIDED BY OPERATING ACTIVITIES $ 265 $ 256 $ 251 September 30, 2020 2019 2018 (In millions) Balance sheet data: Allowance for doubtful accounts $ 3 $ 3 $ 4 Statement of operations data: Maintenance and repairs expense 47 55 52 Research, development and engineering expense 74 75 73 Depreciation expense 87 76 74 Rental expense 19 19 18 Interest income 4 4 3 Interest expense (70) (61) (70) Statement of cash flows data: Interest payments, net of receipts 48 41 49 Income tax payments, net of refunds 55 64 33 Non-cash investing activities - capital asset additions from finance leases — — 4

SIGNIFICANT ACCOUNTING POLICI_2

SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America (GAAP) requires the use of estimates and assumptions related to the reporting of assets, liabilities, revenues, expenses and related disclosures. Actual results could differ from these estimates. Significant estimates and assumptions were used to review goodwill and other long-lived assets for impairment (see Notes 6 and 10), environmental liabilities (see Notes 13, 14 and 22), product warranty liabilities (see Note 13), long-term incentive compensation plan obligations (see Note 18), retiree medical and pension obligations (see Notes 19 and 20), income taxes (see Note 21), and contingencies, including asbestos (see Note 22).
Concentration of Credit Risk	Concentration of Credit RiskIn the normal course of business, the company provides credit to customers. The company limits its credit risk by performing ongoing credit evaluations of its customers and maintaining reserves for potential credit losses and through accounts receivable factoring programs. The company’s accounts receivables are generally due from medium- and heavy-duty truck OEMs, specialty vehicle manufacturers, aftermarket customers, and trailer producers.
Consolidation and Joint Ventures	Consolidation and Joint Ventures The Consolidated Financial Statements include the accounts of the company and those subsidiaries in which the company has control. All intercompany balances and transactions are eliminated in consolidation. The results of operations of controlled subsidiaries are included in the Consolidated Financial Statements and are offset by a related noncontrolling interest recorded for the noncontrolling partners’ ownership. Investments in affiliates that are not controlled are reported using the equity method of accounting (see Note 12).
Foreign Currency	Foreign Currency
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets Long-lived assets, excluding goodwill, to be held and used are reviewed for impairment whenever adverse events or changes in circumstances indicate a possible impairment. An impairment loss is recognized when a long-lived asset group is not recoverable, based on undiscounted cash flows over the remaining useful life of the primary asset of the group, and the long lived asset group's carrying value exceeds the fair value.
Allowance for Doubtful Accounts	Allowance for Doubtful Accounts
Earnings per Share	Earnings per Share
Other	Other  Other significant accounting policies are included in the related notes, specifically, goodwill (Note 6), inventories (Note 9), property and depreciation (Note 10), product warranties (Note 13), financial instruments (Note 16), equity based compensation (Note 18), retirement medical plans (Note 19), retirement pension plans (Note 20), income taxes (Note 21) and environmental and asbestos-related liabilities (Note 22).
Accounting Standards Implemented and to be Implemented	Accounting standards implemented during fiscal year 2020 On October 1, 2019, the company implemented Accounting Standards Update ("ASU") 2016-02, Leases (Topic 842). The company elected the practical expedient package, which allowed the company to not reassess whether existing contracts contain a lease and to not reassess classification of existing leases. The company also adopted ASU 2018-11, Leases (Topic 842) Targeted Improvements, electing to not separate lease and non-lease components in contracts that contain both and electing to not restate comparative periods when adopting ASU 2016-02. As a result, the company recognized a right-of-use asset and lease liability as a lessee for substantially all existing operating leases and has included new and expanded disclosures (Note 4). Accounting standards to be implemented The following represent the standards that may result in a significant change in practice and/or have a significant financial impact on the company. In June 2016, the Financial Accounting Standards Board ("FASB") issued ASU 2016-13, Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The ASU introduces an approach based on expected losses to estimate credit losses on certain types of financial instruments, including accounts receivable. The ASU also modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The company expects to adopt this guidance in the first quarter of fiscal year 2021. The guidance is expected to have an impact on the company's accounting policies and procedures related to calculation of allowance for doubtful accounts receivable but is not expected to have a material impact on its Consolidated Financial Statements. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework—Changes to the Disclosure Requirements for Fair Value Measurement. The amendments in this ASU add, modify, and eliminate certain disclosure requirements on fair value measurements in Topic 820. The amendments in this update are effective for all entities for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Certain amendments should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. Others should be applied retrospectively. The company expects to adopt this guidance in the first quarter of fiscal year 2021. The company is currently evaluating the potential impact of this guidance on its accounting policies and its Consolidated Financial Statements. In August 2020, the FASB issued ASU 2020-06, Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (Subtopic 815-40). The ASU simplifies the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. ASC 470-20 outlines five models to allocate the proceeds attributable to the issuance of a convertible debt instrument. This ASU removes from U.S. GAAP the separation models for convertible debt with a cash conversion feature (CCF) and convertible debt with a beneficial conversion feature (BCF). As a result of adopting this ASU, entities are not required to separately present in equity an embedded conversion feature in such debt. Instead, they should account for a convertible debt instrument wholly as debt. Applying the separation models in ASC 470-20 to convertible instruments with a CCF or BCF involved the recognition of a debt discount, which is amortized to interest expense. The elimination of CCF and BCF models will reduce reported interest expense and increase reported net income for convertible instruments issued within the scope of those models before the adoption of ASU 2020-06. The amendments in this update are required to be adopted by public business entities in fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted, but no earlier than fiscal year beginning after December 15, 2020, including interim periods within those fiscal years. Entities are permitted to adopt the guidance through either a modified retrospective method of transition or a fully retrospective method of transition. The company is currently evaluating the potential impact of this guidance on its accounting policies and its Consolidated Financial Statements.
Revenue and Contract Costs	Revenue is measured based on the consideration to which the company expects to be entitled, and is presented net of any estimates of customer sales allowances, incentives, rebates, and returns. The company recognizes revenue when it satisfies a performance obligation by transferring control over a product or service to a customer. Taxes assessed by a governmental authority that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the company from a customer, are excluded from revenue. Shipping and handling costs associated with outbound freight after control of a product has transferred to a customer are accounted for as a fulfillment cost, as opposed to a distinct performance obligation, and are included in cost of sales. Nature of goods and services The following is a description of principal activities - separated by reportable segments - from which the company generates its revenue. The Commercial Truck segment supplies drivetrain systems and components, including axles, drivelines and braking and suspension systems, primarily for medium- and heavy-duty trucks and other applications in North America, South America, Europe and Asia Pacific. It also supplies a variety of undercarriage products and systems for trailer applications in North America. This segment also includes the company's aftermarket businesses in Asia Pacific and South America. The Aftermarket and Industrial segment supplies axles, brakes, drivelines, suspension parts and other replacement parts to commercial vehicle and industrial aftermarket customers, primarily in North America and Europe. In addition, this segment supplies drivetrain systems and certain components, including axles, drivelines, brakes and suspension systems for military, construction, bus and coach, fire and emergency and other applications in North America and Europe. Although the company may enter into long-term supply arrangements with its major customers, the prices and volumes are not fixed over the term of the arrangements and a contract does not exist under the scope of Topic 606 until prices and volumes are known. As such, individual customer releases or purchase orders represent the contract with the customer. The company accounts for individual products and services separately if they are distinct (i.e., if a product or service is separately identifiable from other items and if a customer can benefit from it on its own or with other resources that are readily available to the customer). The company has identified certain performance obligations related to brake pad fitting and axle dressing where it is acting as an agent and, therefore, recognizes revenue on a net basis for satisfaction of those performance obligations. The company recognizes revenue for the sale of goods at the point in time when the customer takes control of the goods. As such, revenue is recognized upon shipment of product and transfer of ownership to the customer. The amount of revenue recognized is based on the purchase order price and adjusted for variable consideration (i.e., customer sales allowances, incentives, rebates, and returns). Provisions for customer sales allowances, incentives, rebates, and returns are recorded as a reduction of sales at the time of revenue recognition based primarily on historical experience. The company’s payment terms with customers are customary and vary by customer and geography but typically range from 30 to 90 days. The company provides warranties on some of its products. The company records estimated product warranty costs at the time of shipment of products to customers (see Note 13 and Note 14). Contract costs The company applies the practical expedient provided in Topic 606 and recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that the company otherwise would have recognized is one year or less. The costs which are not capitalized are included in cost of sales.
Inventories	Inventories are stated at the lower of cost (using FIFO or average methods) or market (determined on the basis of estimated realizable values)
Net Property	Property is stated at cost. Depreciation of property is based on estimated useful lives, generally using the straight-line method. Estimated useful lives for buildings and improvements range from 10 to 50 years and estimated useful lives for machinery and equipment range from 3 to 25 years. Significant improvements are capitalized, and disposed or replaced property is written off. Maintenance and repairs are charged to expense in the period they are incurred. Company-owned tooling is classified as property and depreciated over the shorter of its expected life or the life of the production contract, generally not to exceed three years. In accordance with the FASB guidance on property, plant and equipment, the company reviews the carrying value of long-lived assets, excluding goodwill, to be held and used, for impairment whenever events or changes in circumstances indicate a possible impairment. An impairment loss is recognized when a long-lived asset’s carrying value is not recoverable and exceeds estimated fair value.
Product Warranty	The company records estimated product warranty costs at the time of shipment of products to customers. Warranty reserves are primarily based on factors that include past claims experience, sales history, product manufacturing and engineering changes and industry developments. Liabilities for product recall campaigns are recorded at the time the company’s obligation is probable and can be reasonably estimated. Policy repair actions to maintain customer relationships are recorded as other liabilities at the time an obligation is probable and can be reasonably estimated. Product warranties, including recall campaigns, not expected to be paid within one year are recorded as a non-current liability.
Fair Value Measurement	Fair Value of Investments The current FASB guidance provides a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets (Level 1) and the lowest priority to unobservable inputs (Level 3). The three levels of the fair value hierarchy are described below: • Level 1 inputs use quoted prices in active markets for identical assets that the Plan has the ability to access. • Level 2 inputs use other inputs that are observable, either directly or indirectly. These Level 2 inputs include quoted prices for similar assets in active markets and other inputs such as interest rates and yield curves that are observable at commonly quoted intervals. • Level 3 inputs are unobservable inputs, including inputs that are available in situations where there is little, if any, market activity for the related asset. In instances where inputs used to measure fair value fall into different levels in the above fair value hierarchy, fair value measurements in their entirety are categorized based on the lowest priority level input that is significant to the valuation. The company's assessment of the significance of particular inputs to these fair value measurements requires judgment and considers factors specific to each asset or liability. Following are descriptions, valuation methodologies and other information related to plan assets. Cash and cash equivalents : The fair value of cash and cash equivalents is valued at cost. Equity Securities : The overall equity category includes common and preferred stocks issued by U.S. and international companies as well as equity funds that invest in these instruments. All investments generally allow near-term (within 90 days of the measurement date) liquidity and are held in issues that are actively traded to facilitate transactions at minimum cost. The aggregate equity portfolio is diversified to avoid exposure to any investment strategy, single economic sector, industry group, or individual security. The fair value of equity securities is determined by either direct or indirect quoted market prices. When the value of assets held in separate accounts is not published, the value is based on the underlying holdings, which are primarily direct quoted market prices on regulated financial exchanges. Most of the equity investments allow daily redemptions, with some requiring a 30-60 day notice. Fixed Income Securities : The overall fixed income category includes U.S. dollar-denominated and international marketable bonds and convertible debt securities as well as fixed income funds that invest in these instruments. All assets generally allow near-term liquidity and are held in issues which are actively traded to facilitate transactions at minimum cost. The aggregate fixed income portfolio is diversified to avoid exposure to any investment strategy, maturity, issuer or credit quality. The fair value of fixed income securities is determined by either direct or indirect quoted market prices. When the value of assets held in separate accounts is not published, the value is based on the underlying holdings, which are primarily direct quoted market prices on regulated financial exchanges. U.S. fixed income securities typically offer daily liquidity, with only one investment allowing quarterly redemptions. International and emerging fixed income investment vehicles generally provide daily liquidity. Commingled Funds : The fair value of commingled funds is determined by a custodian. The custodian obtains valuations from underlying fund managers based on market quotes for the most liquid assets and alternative methods for assets that do not have sufficient trading activity to derive prices. The company and custodian review the methods used by the underlying managers to value the assets. Real Estate : Real estate provides an indirect investment into a diversified and multi-sector portfolio of property assets. The fair value of real estate investments is valued by the fund managers. The fund managers value the real estate investments via independent third-party appraisals on a periodic basis. Assumptions used to revalue the properties are updated every quarter. For the component of the real estate portfolio under development, the investments are carried at cost, which approximates fair value, until they are completed and valued by a third-party appraiser. Due to the long-term nature of real estate investments, liquidity is provided on a quarterly basis. Insurance Contract : The plan entered into a pensioner buy-in insurance contract which reimburses the plan for specified benefit payment streams. The valuation for the buy-in contract is calculated on an insurer pricing basis and is estimated using observable inputs, by adjusting the premium paid for cash flows and movements in gilt yields during the reporting period. Futures Contracts : The plan enters into futures contracts in the normal course of its investing activities to manage market risk and to achieve overall investment portfolio objectives. The credit risk associated with these contracts is minimal as they are traded on organized exchanges and settled daily. The fair value of futures contracts is determined by direct quoted market prices. Cash margin for these futures contracts is included in Cash and Cash Equivalents in the leveling table. Alternatives/Partnerships/Private Equity : This category includes investments in private equity and hedge funds in addition to entering into futures contracts across various asset classes. Such investments may be made directly or through pooled funds, including fund of funds structures. The fair market value of the company’s interest in partnerships and private equity is valued by the fund managers. The valuation is based on the net present value of observable inputs (dividends, cash flows, earnings, etc.), which are discounted at applicable discount rates. The company and custodian review the methods used by the underlying managers to value the assets. Most of these investments offer quarterly redemption opportunities while some offer daily liquidity. Some partnerships and private equity investments, due to the nature of their investment strategy and underlying holdings, offer less frequent liquidity. When available, liquidity events are closely evaluated. The valuation methods described above may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Furthermore, while the company believes its valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement at the reporting date.
Environmental	Environmental Federal, state and local requirements relating to the discharge of substances into the environment, the disposal of hazardous wastes and other activities affecting the environment have, and will continue to have, an impact on the operations of the company. The process of estimating environmental liabilities is complex and dependent upon evolving physical and scientific data at the sites, uncertainties as to remedies and technologies to be used and the outcome of discussions with regulatory agencies. The company records liabilities for environmental issues in the accounting period in which they are considered to be probable and the cost can be reasonably estimated. At environmental sites in which more than one potentially responsible party has been identified, the company records a liability for its allocable share of costs related to its involvement with the site, as well as an allocable share of costs related to insolvent parties or unidentified shares. At environmental sites at which the

SIGNIFICANT ACCOUNTING POLICI_3

SIGNIFICANT ACCOUNTING POLICIES (Tables)	12 Months Ended
	Sep. 30, 2020
Accounting Policies [Abstract]
Schedule of Reconciliation of Basic Average Common Shares Outstanding to Diluted Average Common Shares Outstanding	A reconciliation of basic average common shares outstanding to diluted average common shares outstanding is as follows (in millions): Year Ended September 30, 2020 2019 2018 Basic average common shares outstanding 74.0 83.2 87.5 Impact of restricted shares, restricted share units and performance share units 0.8 2.2 2.8 Impact of convertible notes 0.8 0.9 0.9 Diluted average common shares outstanding 75.6 86.3 91.2

ACQUISITIONS AND DIVESTITURE (T

ACQUISITIONS AND DIVESTITURE (Tables)	12 Months Ended
	Sep. 30, 2020
Business Combinations [Abstract]
Schedule of Pro Forma Financial Information	Pro forma financial information of the company is presented in the following table for the twelve months ended September 30, 2020 and 2019 as if the TransPower acquisition had occurred on October 1, 2018. The pro forma financial information is unaudited and is provided for informational purposes only and does not purport to be indicative of the results which would have actually been attained had the acquisition occurred on October 1, 2018 (in millions). Twelve Months Ended September 30, 2020 2019 Sales $ 3,045 $ 4,394 Net income attributable to Meritor, Inc. 244 282
Schedule of Purchase Price Allocation	Estimated Fair Value As of Measurement Period Adjustments As of Purchase price $ 15 $ — $ 15 Investments in TransPower 12 — 12 $ 27 $ — $ 27 Assets acquired and liabilities assumed: Cash 2 — 2 Receivables, net 5 — 5 Inventories, net 8 — 8 PP&E 10 (1) 9 Identifiable intangible assets — 11 11 Other assets — (1) (1) Accounts payable (3) — (3) Other current liabilities (17) — (17) Total identifiable net assets acquired 5 9 14 Goodwill and other intangible assets resulting from the acquisition of TransPower 22 (9) 13 $ 27 $ — $ 27 Estimated Fair Value As of Measurement Period Adjustments As of Purchase price $ 179 $ (2) $ 177 Assets acquired and liabilities assumed: Cash 11 — 11 Receivables, net 37 (2) 35 Inventories, net 70 (2) 68 Identifiable intangible assets 46 7 53 Other assets 9 (1) 8 PP&E 26 7 33 Accounts payable (33) 1 (32) Other liabilities (48) (17) (65) Total identifiable net assets acquired 118 (7) 111 Goodwill and other intangible assets resulting from the acquisition of AxleTech 61 5 66 $ 179 $ (2) $ 177

LEASES (Tables)

LEASES (Tables)	12 Months Ended
	Sep. 30, 2020
Leases [Abstract]
Schedule of Lease Cost	Components of lease expense (in millions) September 30, 2020 Finance lease costs $ 3 Operating lease costs 20 Total lease costs $ 23 Supplemental cash flow information related to leases (in millions) September 30, 2020 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows used for operating leases $ 19 Financing cash flows used for finance leases 2 Right-of-use assets obtained in exchange for lease obligations: Operating leases 8 Finance leases 3 Supplemental balance sheet information related to leases September 30, 2020 Weighted-average remaining lease term (years): Operating leases 8.55 Finance leases 2.21 Weighted-average discount rate: Operating leases 4.5 % Finance leases 5.0 %
Schedule of Lease Assets and Liabilities	The following table provides a summary of the location and amounts related to finance leases recognized in the Consolidated Balance Sheet (in millions). Classification September 30, 2020 Finance lease right-of-use assets Net Property $ 5 Finance lease liabilities Short-term debt 3 Finance lease liabilities Long-term debt 3 The following table provides a summary of the location and amounts related to operating leases recognized in the Consolidated Balance Sheet (in millions). Classification September 30, 2020 Operating lease right-of-use assets Other assets $ 70 Operating lease liabilities Other current liabilities 15 Operating lease liabilities Other liabilities 59
Schedule of Maturities of Operating Lease Liabilities	Maturities (in millions) Operating Leases Finance Leases 2021 17 3 2022 14 2 2023 13 1 2024 9 — Thereafter 40 — Total lease payments 93 6 Less: Impact of discounting future lease payments (19) — Present value of lease liabilities $ 74 $ 6
Schedule of Maturities of Finance Lease Liabilities	Maturities (in millions) Operating Leases Finance Leases 2021 17 3 2022 14 2 2023 13 1 2024 9 — Thereafter 40 — Total lease payments 93 6 Less: Impact of discounting future lease payments (19) — Present value of lease liabilities $ 74 $ 6
Schedule of Future Minimum Rental Commitments Under Operating Leases	Cash obligations under future minimum rental commitments under operating leases as of September 30, 2019 are shown in the table below (in millions). 2021 2022 2023 2024 2025 Thereafter Total Lease commitments $ 18 $ 15 $ 14 $ 13 $ 13 $ 25 $ 98

REVENUE (Tables)

REVENUE (Tables)	12 Months Ended
	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue by Operating Segment	In the following tables, revenue is disaggregated for each of our reportable segments by primary geographical market for the year ended September 30, 2020 and 2019. Year Ended September 30, 2020 Primary Geographical Market Commercial Truck Aftermarket and Industrial Total U.S. $ 1,052 $ 731 $ 1,783 Canada — 54 54 Mexico 129 18 147 Total North America 1,181 803 1,984 Sweden 202 — 202 Italy 153 13 166 United Kingdom 105 9 114 Other Europe 5 134 139 Total Europe 465 156 621 Brazil 170 2 172 China 134 1 135 India 70 2 72 Other Asia-Pacific 60 — 60 Total sales $ 2,080 $ 964 $ 3,044 Year Ended September 30, 2019 (1) Primary Geographical Market Commercial Truck Aftermarket and Industrial Total U.S. $ 1,737 $ 885 $ 2,622 Canada — 69 69 Mexico 229 20 249 Total North America 1,966 974 2,940 Sweden 276 — 276 Italy 218 16 234 United Kingdom 155 10 165 Other Europe 10 81 91 Total Europe 659 107 766 Brazil 248 — 248 China 153 — 153 India 197 — 197 Other Asia-Pacific 84 — 84 Total sales $ 3,307 $ 1,081 $ 4,388 (1) Amounts for the year ended September 30, 2019 have been recast to reflect reportable segment changes.

GOODWILL (Tables)

GOODWILL (Tables)	12 Months Ended
	Sep. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of the Changes in the Carrying Value of Goodwill	A summary of the changes in the carrying value of goodwill is presented below (in millions): Commercial Truck Aftermarket and Industrial Total Goodwill (1) $ 289 $ 147 $ 436 Accumulated impairment losses (1) — (15) (15) Balance at September 30, 2018 (1) 289 132 421 AAG measurement period adjustment (see Note 3) 3 — 3 Goodwill acquired from acquisition (see Note 3) — 61 61 Foreign currency translation (5) (2) (7) Balance at September 30, 2019 (1) 287 191 478 AxleTech measurement period adjustment (see Note 3) — 5 5 Goodwill acquired from acquisition (see Note 3) 13 — 13 Foreign currency translation 4 1 5 Balance at September 30, 2020 $ 304 $ 197 $ 501

RESTRUCTURING COSTS (Tables)

RESTRUCTURING COSTS (Tables)	12 Months Ended
	Sep. 30, 2020
Restructuring and Related Activities [Abstract]
Schedule of Changes in Restructuring Reserves	The following table summarizes changes in restructuring reserves (in millions): Employee Plant Total Balance at September 30, 2017 $ 5 $ 1 $ 6 Activity during the period: Charges to continuing operations 6 — 6 Cash payments – continuing operations (7) (1) (8) Balance at September 30, 2018 4 — 4 Activity during the period: Charges to continuing operations 8 — 8 Cash payments – continuing operations (5) — (5) Other 1 — 1 Balance at September 30, 2019 8 — 8 Activity during the period: Charges to continuing operations 27 — 27 Cash payments – continuing operations (25) — (25) Total restructuring reserves, end of year 10 — 10 Less: non-current restructuring reserves — — — Restructuring reserves – current, at September 30, 2020 $ 10 $ — $ 10
Schedule of Restructuring Expense Recognized By Segment	Restructuring costs attributable to the company’s business segments during fiscal years 2020, 2019 and 2018 are as follows (in millions): Commercial Truck Aftermarket and Industrial Corporate Total Fiscal year 2020 Global Restructuring Program 2020 $ 7 $ 3 $ — $ 10 Global Restructuring Program 2019 11 2 — 13 AxleTech — 2 — 2 Other 1 1 — 2 Total restructuring costs $ 19 $ 8 $ — $ 27 Fiscal year 2019 (1) : Global Restructuring Program 2019 6 1 — 7 AxleTech — 3 — 3 Other (1) (1) — (2) Total restructuring costs $ 5 $ 3 $ — $ 8 Fiscal year 2018 (1) : Segment Realignment Program — 3 — 3 Other 1 1 1 3 Total restructuring costs $ 1 $ 4 $ 1 $ 6 (1) Fiscal years 2019 and 2018 have been recast to reflect reportable segment changes.

ACCOUNTS RECEIVABLE FACTORING_2

ACCOUNTS RECEIVABLE FACTORING AND SECURITIZATION (Tables)	12 Months Ended
	Sep. 30, 2020
Accounts Receivable Factoring And Securitization [Abstract]
Schedule of Accounts Receivable Factoring and Securitization	The company has a U.S. accounts receivable securitization facility with PNC Bank and participates in various accounts receivable factoring programs, primarily with Nordea Bank for trade receivables from AB Volvo as follows (in millions): Current Expiration Total Facility Size as of 9/30/20 Utilized as of 9/30/20 Utilized as of 9/30/19 EUR USD EUR USD EUR USD On-balance sheet arrangement: Committed U.S. accounts receivable securitization (1) December 2022 N/A $ 95 N/A $ 3 N/A $ 13 Total on-balance sheet arrangement: (1) N/A $ 95 N/A $ 3 N/A $ 13 Off-balance sheet arrangements: Committed Swedish factoring facility (2)(3) March 2024 € 155 $ 181 € 86 $ 100 € 109 $ 119 Committed U.S. factoring facility (2) February 2023 N/A 75 N/A 30 N/A 58 Uncommitted U.K. factoring facility February 2022 25 29 1 1 6 6 Uncommitted Italy factoring facility June 2022 30 35 8 9 21 23 Other uncommitted factoring facilities (4) None N/A N/A 12 14 18 20 Total off-balance sheet arrangements € 210 $ 320 € 107 $ 154 € 154 $ 226 (1) Availability subject to adequate eligible accounts receivable available for sale. The utilized amount includes $3 million and $4 million of letters of credit as of September 30, 2020 and September 30, 2019, respectively. (2) Actual amounts may exceed the bank's commitment at the bank's discretion. (3) The facility is backed by a 364-day liquidity commitment from Nordea Bank which extends through June 22, 2021. (4) There is no explicit facility size under the factoring agreement, but the counterparty approves the purchase of receivable tranches at its discretion.

INVENTORIES (Tables)

INVENTORIES (Tables)	12 Months Ended
	Sep. 30, 2020
Inventory Disclosure [Abstract]
Schedule of Inventory	Inventories are stated at the lower of cost (using FIFO or average methods) or market (determined on the basis of estimated realizable values) and are summarized as follows (in millions): September 30, 2020 2019 Finished goods $ 119 $ 153 Work in process 38 39 Raw materials, parts and supplies 278 334 Total $ 435 $ 526

NET PROPERTY (Tables)

NET PROPERTY (Tables)	12 Months Ended
	Sep. 30, 2020
Property, Plant and Equipment [Abstract]
Schedule of Net Property	Net property is summarized as follows (in millions): September 30, 2020 2019 Property at cost: Land and land improvements $ 32 $ 31 Buildings 228 224 Machinery and equipment 1,002 935 Company-owned tooling 151 136 Construction in progress 63 74 Total 1,476 1,400 Less: Accumulated depreciation (961) (885) Net property $ 515 $ 515

OTHER ASSETS (Tables)

OTHER ASSETS (Tables)	12 Months Ended
	Sep. 30, 2020
Other Assets, Noncurrent [Abstract]
Schedule of Other Assets	Other assets are summarized as follows (in millions): September 30, 2020 2019 Prepaid pension costs (see Note 20) $ 179 $ 149 Deferred income tax assets (see Note 21) 30 122 Investments in non-consolidated joint ventures (see Note 12) 107 110 Other 269 225 Other assets $ 585 $ 606

INVESTMENTS IN NON-CONSOLIDAT_2

INVESTMENTS IN NON-CONSOLIDATED JOINT VENTURES (Tables)	12 Months Ended
	Sep. 30, 2020
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Non-Consolidated Joint Ventures and Direct Ownership Interests	The company’s non-consolidated joint ventures and related direct ownership interest are as follows: September 30, 2020 2019 2018 Master Sistemas Automotivos Ltda. 49 % 49 % 49 % Sistemas Automotrices de Mexico S.A. de C.V. 50 % 50 % 50 % Ege Fren Sanayii ve Ticaret A.S. 49 % 49 % 49 % Automotive Axles Limited 36 % 36 % 36 %
Summarized Balance Sheet Information of Non-Consolidated Joint Ventures	The summarized financial information presented below represents the combined accounts of the company’s non-consolidated joint ventures related to its continuing operations (in millions): September 30, 2020 2019 Current assets $ 308 $ 427 Non-current assets 200 211 Total assets $ 508 $ 638 Current liabilities $ 209 $ 305 Non-current liabilities 87 109 Total liabilities $ 296 $ 414
Summarized Income Statement Information of Non-Consolidated Joint Ventures	Year Ended September 30, 2020 2019 2018 Sales $ 696 $ 1,231 $ 1,101 Gross profit 76 147 154 Net income 30 63 59

OTHER CURRENT LIABILITIES (Tabl

OTHER CURRENT LIABILITIES (Tables)	12 Months Ended
	Sep. 30, 2020
Other Current Liabilities Disclosure [Abstract]
Schedule of Other Current Liabilities	Other current liabilities are summarized as follows (in millions): September 30, 2020 2019 Compensation and benefits $ 91 $ 125 Income taxes 6 24 Product warranties 19 18 Other 148 118 Other current liabilities $ 264 $ 285
Schedule of Product Warranties	A summary of the changes in product warranties is as follows (in millions): September 30, 2020 2019 2018 Total product warranties – beginning of year $ 50 $ 54 $ 45 Accruals for product warranties 25 23 22 Payments (19) (20) (16) Change in estimates and other (2) (7) 3 Total product warranties – end of year 54 50 54 Less: non-current product warranties (see Note 14) (35) (32) (35) Product warranties – current $ 19 $ 18 $ 19

OTHER LIABILITIES (Tables)

OTHER LIABILITIES (Tables)	12 Months Ended
	Sep. 30, 2020
Other Liabilities Disclosure [Abstract]
Schedule Of Other Liabilities	Other liabilities are summarized as follows (in millions): September 30, 2020 2019 Asbestos-related liabilities (see Note 22) $ 67 $ 82 Liabilities for uncertain tax positions (see Note 21) 73 46 Product warranties (see Note 13) 35 32 Other 104 66 Other liabilities $ 279 $ 226

LONG-TERM DEBT (Tables)

LONG-TERM DEBT (Tables)	12 Months Ended
	Sep. 30, 2020
Debt Disclosure [Abstract]
Schedule of Long-term Debt Instruments	Long-term debt, net of discounts where applicable, is summarized as follows (in millions): September 30, 2020 2019 3.25 percent convertible notes due 2037 (1)(3) $ 320 $ 319 7.875 percent convertible notes due 2026 (1)(4) 23 23 6.25 percent notes due 2025 (2)(5) 295 — Term loan due 2024 166 175 6.25 percent notes due 2024 (2)(6) 446 444 Finance lease obligation 6 7 Borrowings and securitization — 9 Unamortized discount on convertible notes (7) (29) (34) Subtotal 1,227 943 Less: current maturities (39) (41) Long-term debt $ 1,188 $ 902 (1) The 3.25 percent convertible notes due 2037 and 7.875 percent convertible notes due 2026 contain a put and call feature, which allows for early redemption beginning in 2025 and 2020, respectively. (2) The 6.25 percent notes due 2024 and 2025 contain a call option, which allows for early redemption by Meritor. (3) The 3.25 percent convertible notes due 2037 are presented net of $5 million and $6 million unamortized issuance costs as of September 30, 2020 and September 30, 2019, respectively. (4) The 7.875 percent convertible notes due 2026 are presented net of unamortized issuance costs of an insignificant amount as of September 30, 2020 and September 30, 2019, an d an insignificant amount and $1 million original issuance discount as of September 30, 2020 and September 30, 2019, respectively. (5) The 6.25 percent notes due 2025 are presented net of $5 million unamortized issuance costs as of September 30, 2020. (6) The 6.25 percent notes due 2024 are presented net of $4 million and $6 million unamortized issuance costs as of September 30, 2020 and September 30, 2019, respectively (7) The carrying amount of the equity component related to convertible debt.
Debt Instrument Redemption Summary	Year Redemption Price 2022 103.125 % 2023 101.563 % 2024 and thereafter 100.000 % Year Redemption Price 2019 103.125% 2020 102.083% 2021 101.042% 2022 and thereafter 100.000%
Schedule of Principle and Unamortized Discount on Convertible Notes	The following table summarizes the principal amounts and related unamortized discount on all convertible notes (in millions): September 30, 2020 2019 Principal amount of convertible notes $ 348 $ 348 Unamortized discount on convertible notes and issuance costs (34) (40) Net carrying value $ 314 $ 308
Summary of Convertible Notes	The following table summarizes other information related to the convertible notes: Convertible Notes 7.875% 3.25% Total amortization period for debt discount (in years): 8 8 Remaining amortization period for debt discount (in years): 0 5 Effective interest rates on convertible notes: 10.9 % 5.6 %
Schedule of Interest Costs on Convertible Notes	The following table summarizes interest costs recognized on convertible notes (in millions): Year Ended September 30, 2020 2019 2018 Contractual interest coupon $ 17 $ 17 $ 17 Amortization of debt discount 2 2 2 Total $ 19 $ 19 $ 19
Schedule of Long-term Debt Maturities	As of September 30, 2020, the company is contractually obligated to make payments as follows (in millions): Total 2021 (2) 2022 2023 2024 (3) 2025 (4) Thereafter (5) Total debt (1) $ 1,265 $ 36 $ 18 $ 13 $ 573 $ 300 $ 325 (1) Total debt excludes unamortized discount on convertible notes of $29 million, unamortized issuance costs of $14 million, and original issuance discount of an insignificant amount. (2) Includes the 7.875 Percent Convertible Notes, which will be early redeemed on December 1, 2020 (3) Includes the 6.25 Percent Notes due 2024, which contain a call feature that allows for early redemption (4) Includes the 6.25 Percent Notes due 2025, which contain a call feature that allows for early redemption

FINANCIAL INSTRUMENTS (Tables)

FINANCIAL INSTRUMENTS (Tables)	12 Months Ended
	Sep. 30, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of the Impact of Derivatives on Comprehensive Income	The following table summarizes the impact of the company’s derivatives instruments on comprehensive income for fiscal years ended September 30 (in millions): Location of 2020 2019 2018 Derivatives designated as hedging instruments: Amount of gain recognized in AOCI AOCI $ 4 $ 19 $ 3 Amount of gain (loss) reclassified from AOCI into income Cost of Sales (1) 4 (1) Derivatives not designated as hedging instruments: Cost of Sales — — (2) Derivatives not designated as hedging instruments: Other Income (expense) 1 1 2
Summary of Fair Value of Financial Instruments	Fair values of financial instruments are summarized as follows (in millions): September 30, 2020 September 30, 2019 Carrying Fair Carrying Fair Cash and cash equivalents $ 315 $ 315 $ 108 $ 108 Short-term debt 39 58 41 60 Long-term debt 1,188 1,259 902 953 Foreign currency option contracts (other assets) 1 1 — — Foreign exchange forward contracts (other liabilities) 1 1 — — Cross-currency swap (other assets) — — 10 10 Cross-currency swaps (other liabilities) — — 5 5
Schedule of Offsetting of Derivative Assets and Liabilities	The following table reflects the offsetting of derivative assets and liabilities (in millions): September 30, 2020 September 30, 2019 Gross Gross Amounts Net Amounts Gross Gross Amounts Net Amounts Derivative Asset Foreign currency option contract 1 — 1 — — — Cross-currency swaps — — — 10 — 10 Derivative Liabilities Foreign exchange forward contract 1 — 1 — — — Cross-currency swaps — — — 5 — 5
Fair Value of Financial Instruments by the Valuation Hierarchy	Fair value of financial instruments by the valuation hierarchy at September 30, 2020 is as follows (in millions): Level 1 Level 2 Level 3 Cash and cash equivalents $ 315 $ — $ — Short-term debt — 43 15 Long-term debt — 1,103 156 Foreign exchange forward contracts (asset) — — — Foreign exchange forward contracts (liability) — 1 — Foreign currency option contracts (other assets) — 1 — Cross-currency swaps (other assets) — — — Cross-currency swaps (other liabilities) — — — Fair value of financial instruments by the valuation hierarchy at September 30, 2019 is as follows (in millions): Level 1 Level 2 Level 3 Cash and cash equivalents $ 108 $ — $ — Short-term debt — 49 11 Long-term debt — 782 171 Foreign exchange forward contracts (asset) — — — Foreign exchange forward contracts (liability) — — — Foreign currency option contracts (other assets) — — — Cross-currency swaps (other assets) — 10 — Cross-currency swaps (other liabilities) — 5 —
Reconciliation of Changes in Fair Value of Level 3 Financial Assets and Liabilities	The tables below provide a reconciliation of changes in fair value of the Level 3 financial assets and liabilities measured at fair value in the Consolidated Balance Sheet for the twelve months ended September 30, 2020 and September 30, 2019, respectively. No transfers of assets between any of the Levels occurred during these periods. Twelve months ended September 30, 2020 (in millions) Short-term foreign currency option contracts (asset) Long-term foreign currency option contracts (asset) Total Fair Value as of September 30, 2019 $ — $ — $ — Total unrealized gains: Included in other income — — — Included in cost of sales — — — Total realized gains: Included in other income 1 — 1 Included in cost of sales — — — Purchases, issuances, sales and settlements: Purchases 2 — 2 Settlements (2) — (2) Transfer in and / or out of Level 3 (1) — — — Reclass between short-term and long-term — — — Fair Value as of September 30, 2020 $ 1 $ — $ 1 (1) Transfers as of the last day of the reporting period Twelve months ended September 30, 2019 (in millions) Short-term foreign currency option/collar contracts (asset) Long-term foreign currency option/collar contracts (asset) Total Fair Value as of September 30, 2018 $ — $ — $ — Total unrealized gains: Included in other income (1) — (1) Included in cost of sales 1 — 1 Total realized gains: Included in other income 1 — 1 Included in cost of sales — — — Purchases, issuances, sales and settlements: Purchases — — — Settlements (1) — (1) Transfer in and / or out of Level 3 (1) — — — Reclass between short-term and long-term — — — Fair Value as of September 30, 2019 $ — $ — $ — (1) Transfers as of the last day of the reporting period

SHAREHOLDERS' EQUITY (Tables)

SHAREHOLDERS' EQUITY (Tables)	12 Months Ended
	Sep. 30, 2020
Equity [Abstract]
Components of Accumulated Other Comprehensive Loss	The components of AOCI as reported in the Consolidated Balance Sheet and Statement of Equity, and the changes in AOCI by components, net of tax, are as follows (in millions): Foreign Currency Translation Employee Benefit Related Adjustments Unrealized Income (Loss) on cash flow hedges Total Balance at September 30, 2019 $ (107) $ (572) $ (2) $ (681) Other comprehensive income (loss) before reclassification (22) 79 (1) 56 Amounts reclassified from accumulated other comprehensive income — 10 1 11 Net current-period other comprehensive income (loss) $ (22) $ 89 $ — $ 67 Balance at September 30, 2020 $ (129) $ (483) $ (2) $ (614) Foreign Currency Translation Employee Benefit Related Adjustments Unrealized Income (Loss) on cash flow hedges Total Balance at September 30, 2018 $ (90) $ (476) $ — $ (566) Other comprehensive income (loss) before reclassification (17) (100) 2 (115) Amounts reclassified from accumulated other comprehensive income (loss) — 4 (4) — Net current-period other comprehensive loss $ (17) $ (96) $ (2) $ (115) Balance at September 30, 2019 $ (107) $ (572) $ (2) $ (681) Foreign Currency Translation Employee Benefit Related Adjustments Unrealized Income (Loss) on cash flow hedges Total Balance at September 30, 2017 $ (41) $ (500) $ (4) $ (545) Other comprehensive income (loss) before reclassification (49) 8 3 (38) Amounts reclassified from accumulated other comprehensive income — 16 1 17 Net current-period other comprehensive income (loss) $ (49) $ 24 $ 4 $ (21) Balance at September 30, 2018 $ (90) $ (476) $ — $ (566)
Changes in Accumulated Other Comprehensive Income	Details about Accumulated Other Comprehensive Income Components Amount Reclassified from Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Operations Employee Benefit Related Adjustment Amortization of prior service benefit $ (36) (a) Amortization of actuarial losses 47 (a) 11 Total before tax (1) Tax (benefit) expense Total reclassifications for the period $ 10 Net of tax (a ) These accumulated other comprehensive income components are included in the computation of net periodic pension and retiree medical expense (see Notes 19 and 20 for additional details), which is recorded in other income (expense), net. Details about Accumulated Other Comprehensive Income Components Amount Reclassified from Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Operations Employee Benefit Related Adjustment Amortization of prior service benefit $ (35) (a) Amortization of actuarial losses 39 (a) 4 Total before tax — Tax (benefit) expense Total reclassifications for the period $ 4 Net of tax (a) These accumulated other comprehensive income components are included in the computation of net periodic pension and retiree medical expense (see Notes 19 and 20 for addi tional details), which is recorded in other income (expense), net. Details about Accumulated Other Comprehensive Income Components Amount Reclassified from Accumulated Other Comprehensive Income Affected Line Item in the Consolidated Statement of Operations Employee Benefit Related Adjustment Amortization of prior service benefit $ (35) (a) Amortization of actuarial losses 46 (a) Recognized prior service costs due to settlement 6 (a) 17 Total before tax (1) Tax (benefit) expense Total reclassifications for the period $ 16 Net of tax (a) These accumulated other comprehensive income components are included in the computation of net periodic pension and retiree medical expense (see Notes 19 and 20 for additional details), which is recorded in other income (expense), net.

EQUITY BASED COMPENSATION (Tabl

EQUITY BASED COMPENSATION (Tables)	12 Months Ended
	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Roll forward of Non-vested Restricted Stock, Restricted Share and Performance Share Units and Activity	The following is a rollforward of the company’s non-vested restricted stock and restricted share units as of September 30, 2020, and the activity during fiscal year 2020 is summarized as follows (shares in thousands): Number of Weighted-Average Balance at September 30, 2019 1,320 $ 17.55 Granted 558 23.77 Vested (533) 13.57 Forfeited (170) 21.41 Balance at September 30, 2020 1,175 21.75 The following is a rollforward of the company’s non-vested performance share units as of September 30, 2020, and the activity during fiscal year 2020 is summarized as follows (shares in thousands): Number of Weighted-Average Balance at September 30, 2019 1,325 $ 17.08 Granted 732 19.42 Vested (851) 12.92 Forfeited (170) 20.90 Balance at September 30, 2020 1,036 21.52

RETIREMENT MEDICAL PLANS (Table

RETIREMENT MEDICAL PLANS (Tables)	12 Months Ended
	Sep. 30, 2020
Defined Benefit Plan, Postretirement Medical Plan with Prescription Drug Benefits [Abstract]
Schedule of Retiree Medical Liability Expense Assumptions	The following are the assumptions used in the measurement of the accumulated postretirement benefit obligation ("APBO") and retiree medical expense: 2020 2019 2018 Discount rate 2.56 % 2.98 % 4.05 % Health care cost trend rate 6.07 % 6.36 % 6.18 % Ultimate health care trend rate 4.67 % 4.69 % 4.63 % Year ultimate rate is reached 2028 2028 2024
Retiree Medical Liability Components as of Balance Sheet Date	The APBO as of the September 30, 2020 and 2019 measurement dates are summarized as follows (in millions): 2020 2019 Retirees $ 52 $ 67 Employees eligible to retire — — Total $ 52 $ 67
Rollforward of Retiree Medical Liability	The following reconciles the change in APBO and the amounts included in the Consolidated Balance Sheet for years ended September 30, 2020 and 2019, respectively (in millions): 2020 2019 APBO — beginning of year $ 67 $ 86 Interest cost 2 3 Actuarial loss (gain) — 4 Plan amendment (7) (15) Benefit payments (1) (10) (11) APBO — end of year 52 67 Retiree medical liability $ 52 $ 67 (1) Net of subsidies and rebates available under Employer Group Waiver Plan ("EGWP").
Schedule of Retiree Medical Liability Current and Long Term Components	The retiree medical liability is included in the Consolidated Balance Sheet as follows (in millions): September 30, 2020 2019 Current — included in compensation and benefits $ 6 $ 11 Long-term — included in retirement benefits 46 56 Retiree medical liability $ 52 $ 67
Retiree Medical Obligations Recorded in Accumulated Other Comprehensive Loss Net of Tax	The following table summarizes the amounts included in AOCL net of tax related to retiree medical liabilities as of September 30, 2020 and 2019 and changes recognized in Other Comprehensive Income (Loss) net of tax for the years ended September 30, 2020 and 2019. Net Actuarial Prior Total Balance at September 30, 2019 $ 70 $ (165) $ (95) Net actuarial loss for the year — — — Recognized prior service costs due to plan amendment — (7) (7) Amortization for the year (14) 36 22 Deferred tax impact 8 (3) 5 Balance at September 30, 2020 $ 64 $ (139) $ (75) Balance at September 30, 2018 $ 76 $ (178) $ (102) Net actuarial gain for the year 4 — 4 Recognized prior service costs due to plan amendment — (15) (15) Amortization for the year (15) 35 20 Deferred tax impact 5 (7) (2) Balance at September 30, 2019 $ 70 $ (165) $ (95)
Components of Retiree Medical Expense	The components of retiree medical expense for the years ended September 30 are as follows (in millions): 2020 2019 2018 Service cost $ — $ — $ — Interest cost 2 3 3 Amortization of: Prior service benefit (36) (35) (35) Actuarial losses 14 15 17 Retiree medical income $ (20) $ (17) $ (15)
Retiree Medical Plan Effect of One Percentage Point Change in Assumed Health Care Cost Trend Rates	A one-percentage point change in the assumed health care cost trend rate for all years to, and including, the ultimate rate would have the following effects (in millions): 2020 2019 Effect on total service and interest cost 1% Increase $ — $ — 1% Decrease — — Effect on APBO 1% Increase 6 5 1% Decrease (5) (4)
Retiree Medical Plan Estimated Future Benefit Payments	The company expects future benefit payments as follows (in millions): Gross Gross Receipts (1) Fiscal 2021 $ 6 $ — Fiscal 2022 5 — Fiscal 2023 5 — Fiscal 2024 4 — Fiscal 2025 4 — Fiscal 2026 – 2029 13 2 (1) Consists of subsidies and rebates available under EGWP.

RETIREMENT PENSION PLANS (Table

RETIREMENT PENSION PLANS (Tables)	12 Months Ended
	Sep. 30, 2020
Retirement Benefits [Abstract]
Schedule of US Pension Benefit Obligation Expense and Net Expense Assumptions	The following are the significant assumptions used in the measurement of the projected benefit obligation ("PBO") and net periodic pension expense: U.S. Plans 2020 2019 2018 Discount rate 2.50% - 2.60% 3.10% - 3.15% 4.30% Assumed return on plan assets (beginning of the year) 7.75% 7.75% 7.75%
Schedule of Non-US Pension Benefit Obligation Expense and Net Expense Assumptions	U.K. Plan 2020 2019 2018 Discount rate 1.70% 1.80% 2.90% Assumed return on plan assets (beginning of the year) 5.75% 6.00% 6.00%
Rollforward of Pension Liability and Pension Plan Assets	The following table reconciles the change in the PBO, the change in plan assets and amounts included in the Consolidated Balance Sheet for the years ended September 30, 2020 and 2019, respectively (in millions): 2020 2019 U.S. Non- U.S. Total U.S. Non- U.S. Total PBO — beginning of year $ 1,006 $ 621 $ 1,627 $ 922 $ 554 $ 1,476 Interest cost 31 11 42 37 16 53 Actuarial (gain) loss 64 (24) 40 122 111 233 Prior service cost — — — — 8 8 Acquisitions — — — — 1 1 Settlements — — — — (3) (3) Benefit payments (74) (25) (99) (75) (30) (105) Foreign currency rate changes — 19 19 — (36) (36) PBO — end of year $ 1,027 $ 602 $ 1,629 $ 1,006 $ 621 $ 1,627 Change in plan assets Fair value of assets — beginning of year $ 741 $ 764 $ 1,505 $ 744 $ 702 $ 1,446 Actual return on plan assets 221 12 233 67 139 206 Employer contributions 5 — 5 5 — 5 Settlements — — — — (3) (3) Benefit payments (74) (25) (99) (75) (30) (105) Foreign currency rate changes — 25 25 — (44) (44) Fair value of assets — end of year $ 893 $ 776 $ 1,669 $ 741 $ 764 $ 1,505 Funded status - over (under) $ (134) $ 174 $ 40 $ (265) $ 143 $ (122)
Schedule of Balance Sheet Classification of Net Pension Liability	Amounts included in the Consolidated Balance Sheet at September 30, 2020 and 2019 are comprised of the following (in millions): 2020 2019 U.S. Non-U.S. Total U.S. Non-U.S. Total Non-current assets $ — $ 179 $ 179 $ — $ 149 $ 149 Current liabilities (5) — (5) (5) — (5) Retirement benefits-non-current (129) (5) (134) (260) (6) (266) Net amount recognized $ (134) $ 174 $ 40 $ (265) $ 143 $ (122)
Schedule of Pension Costs Recognized in Other Comprehensive Loss	The following tables summarize the amounts included in AOCL net of tax related to pension liabilities as of September 30, 2020 and 2019 and changes recognized in Other Comprehensive Income (Loss) net of tax for the year ended September 30, 2020. Net Actuarial Loss U.S. Non-U.S. Total Balance at September 30, 2019 $ 467 $ 200 $ 667 Net actuarial loss for the year (101) 3 (98) Amortization for the year (26) (7) (33) Deferred tax impact 22 — 22 Balance at September 30, 2020 $ 362 $ 196 $ 558 Balance at September 30, 2018 $ 394 $ 184 $ 578 Net actuarial loss for the year 113 20 133 Amortization for the year (20) (4) (24) Deferred tax impact (20) — (20) Balance at September 30, 2019 $ 467 $ 200 $ 667
Pension and Other Postretirement Benefits	The non-current portion of the pension liability is included in Retirement Benefits in the Consolidated Balance Sheet as follows (in millions): September 30, 2020 2019 Pension liability $ 134 $ 266 Retiree medical liability — long term (see Note 19) 46 56 Other 16 14 Total retirement benefits $ 196 $ 336
Schedule of Projected Benefit Obligation Accumulated Benefit Obligation and Plan Assets	Additional information is as follows (in millions): 2020 2019 ABO Assets Total ABO Assets Total PBO $ 1,032 $ 597 $ 1,629 $ 1,012 $ 615 $ 1,627 ABO 1,032 597 1,629 1,012 615 1,627 Plan Assets 893 776 1,669 741 764 1,505
Schedule of Net Periodic Pension Benefit Costs	The components of net periodic pension expense are as follows (in millions): 2020 2019 2018 Service cost $ — $ — $ — Interest cost 42 53 54 Assumed rate of return on plan assets (97) (97) (99) Amortization of actuarial losses 33 24 29 Settlement loss — — 6 Net periodic pension income $ (22) $ (20) $ (10)
Pension Plan Investments Measured at Fair Value by Level Within Fair Value Hierarchy	The fair value of plan assets at September 30, 2020 by asset category is as follows (in millions): U.S. Plans 2020 Asset Category Level 1 Level 2 Level 3 Total Equity investments U.S. – Large cap $ 209 $ — $ — $ 209 U.S. – Small cap 15 — — 15 International equity 12 — — 12 Equity investments measured at net asset value (1) — — — 189 Total equity investments $ 236 $ — $ — $ 425 Fixed income investments U.S. fixed income $ 9 $ 270 $ — $ 279 Emerging fixed income — 13 — 13 Partnerships fixed income — — — — Fixed income investments measured at net asset value (1) — — — 26 Total fixed income $ 9 $ 283 $ — $ 318 Alternatives 9 — — 9 Alternatives – Partnerships — — 5 5 Alternatives – Partnerships measured at net asset value (1) — — — 74 Cash and cash equivalents — 62 — 62 Total assets at fair value $ 254 $ 345 $ 5 $ 893 Non-U.S. Plans 2020 Asset Category Level 1 Level 2 Level 3 Total Equity investments International equity $ 180 $ — $ — $ 180 Total equity investments $ 180 $ — $ — $ 180 Fixed income investments Other fixed income investments $ 5 $ 214 $ — $ 219 Fixed income investments measured at net asset value (1) — — — 71 Total fixed income $ 5 $ 214 $ — $ 290 Commingled funds — 2 — 2 Alternative investments measured at net asset value (1) — — — 127 Real estate measured at net asset value (1) — — — 37 Cash and cash equivalents — 9 — 9 Insurance contract — 131 — 131 Total assets at fair value $ 185 $ 356 $ — $ 776 (1) In accordance with Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the statement of financial position. The fair value of plan assets at September 30, 2019 by asset category is as follows (in millions): U.S. Plans 2019 Asset Category Level 1 Level 2 Level 3 Total Equity investments U.S. – Large cap $ 38 $ — $ — $ 38 U.S. – Small cap 15 — — 15 Private equity — — 19 19 International equity 21 — — 21 Equity investments measured at net asset value (1) — — — 154 Total equity investments $ 74 $ — $ 19 $ 247 Fixed income investments U.S. fixed income $ 3 $ 233 $ — $ 236 Emerging fixed income — 16 — 16 Partnerships fixed income 12 — — 12 Fixed income investments measured at net asset value (1) — — — 27 Total fixed income $ 15 $ 249 $ — $ 291 Alternatives – Partnerships — — 86 86 Alternatives – Partnerships measured at net asset value (1) — — — 78 Cash and cash equivalents — 39 — 39 Total assets at fair value $ 89 $ 288 $ 105 $ 741 Non-U.S. Plans 2019 Asset Category Level 1 Level 2 Level 3 Total Equity investments International equity $ 170 $ — $ — $ 170 Total equity investments $ 170 $ — $ — $ 170 Fixed income investments Other fixed income investments $ 6 $ 222 $ — $ 228 Fixed income investments measured at net asset value (1) — — — 189 Total fixed income $ 6 $ 222 $ — $ 417 Commingled funds — 3 — 3 Alternative investments measured at net asset value (1) — — — 124 Real estate measured at net asset value (1) — — — 38 Cash and cash equivalents — 12 — 12 Total assets at fair value $ 176 $ 237 $ — $ 764 (1)
Changes in Level 3, Pension Plan Investments	The following table summarizes the changes in Level 3 pension plan assets measured at fair value on a recurring basis for the year ended September 30, 2020 (in millions): U.S. Plans 2020 Fair Value at October 1, 2019 Return on Plan Assets: Attributable to Assets Held at September 30, 2020 Purchases Settlements Net Transfers Into (Out of) Level 3 Fair Value at September 30, 2020 Asset Category Private equity $ 19 $ — $ — $ — $ (19) $ — Alternatives – Partnerships 86 1 — (1) (81) 5 Total Level 3 fair value $ 105 $ 1 $ — $ (1) $ (100) $ 5 The following table summarizes the changes in Level 3 pension plan assets measured at fair value on a recurring basis for the year ended September 30, 2019 (in millions): U.S. Plans 2019 Fair Value at October 1, 2018 Return on Plan Assets: Attributable to Assets Held at September 30, 2019 Purchases Settlements Net Transfers Into (Out of) Level 3 Fair Value at September 30, 2019 Asset Category Private equity $ 17 $ 2 $ — $ — $ — $ 19 Alternatives – Partnerships 83 4 — (1) — 86 Total Level 3 fair value $ 100 $ 6 $ — $ (1) $ — $ 105
Pension Plan Estimated Future Contributions and Benefit Payments	Information about the expected cash flows for the U.S. and non-U.S. pension plans is as follows (in millions): U.S. Non U.S. Total Expected employer contributions: Fiscal 2021 $ 5 $ 1 $ 6 Expected benefit payments: Fiscal 2021 70 25 95 Fiscal 2022 70 25 95 Fiscal 2023 68 25 93 Fiscal 2024 67 25 92 Fiscal 2025 66 25 91 Fiscal 2026-2030 302 124 426

INCOME TAXES (Tables)

INCOME TAXES (Tables)	12 Months Ended
	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Components of Income Before Income Tax	The income tax provisions were calculated based upon the following components of income before income taxes (in millions): 2020 2019 2018 U.S. income $ 268 $ 194 $ 85 Foreign income 58 183 193 Total $ 326 $ 377 $ 278
Summary of Components of the Benefit (Provision) for Income Taxes	The components of the provision (benefit) for income taxes are summarized as follows (in millions): 2020 2019 2018 Current tax expense: U.S. $ 20 $ 1 $ 24 Foreign 16 40 51 State and local 4 1 — Total current tax expense 40 42 75 Deferred tax expense (benefit): U.S. 40 34 76 Foreign (5) 6 (5) State and local 3 — 3 Total deferred tax expense 38 40 74 Income tax expense $ 78 $ 82 $ 149
Summary of the Tax Effects of Temporary Differences	Net deferred income tax assets (liabilities) included in the Consolidated Balance Sheet consist of the tax effects of temporary differences related to the following (in millions): September 30, 2020 2019 Accrued compensation and benefits $ 13 $ 19 Accrued product warranties 11 11 Inventory costs 12 7 Receivables 8 8 Asbestos and environmental 5 8 Accrued retiree healthcare benefits 13 16 Retirement pension plans 25 59 Property 9 7 Lease liabilities 18 — Loss and credit carryforwards 215 230 Other 16 18 Sub-total 345 383 Less: Valuation allowances (226) (207) Deferred income taxes - asset $ 119 $ 176 Taxes on undistributed income $ (11) $ (10) Intangible assets (65) (51) Lease assets (17) — Debt basis difference (7) (8) Deferred income taxes - liability $ (100) $ (69) Net deferred income tax assets $ 19 $ 107
Schedule of Net Current and Non-Current Deferred Income Tax Assets (Liabilities)	Net deferred income tax assets (liabilities) are included in the Consolidated Balance Sheet as follows (in millions): September 30, 2020 2019 Other assets (see Note 11) $ 30 $ 122 Other liabilities (see Note 14) (11) (15) Net deferred income taxes — asset $ 19 $ 107
Summary of Tax Credit Carryforwards and Deferred Tax Assets	The expiration periods for deferred tax assets related to net operating losses and tax credit carryforwards as of September 30, 2020 are included below (in millions). Also included are the associated valuation allowances on these deferred tax assets (in millions). Fiscal Year Expiration Periods 2021-2025 2026-2035 2036-2040 Indefinite Total Net Operating Losses and Tax Credit Carryforwards $ 7 $ 15 $ — $ 193 $ 215 Valuation Allowances on these Deferred Tax Assets $ 6 $ 13 $ — $ 188 $ 207
Reconciliation of Income Tax (Benefit) Provision at the U.S Statutory Rate	The company’s provision (benefit) for income taxes was different from the provision for income taxes calculated at the U.S. statutory rate for the reasons set forth below (in millions): 2020 2019 2018 Expense for income taxes at statutory tax rate $ 68 $ 79 $ 68 State and local income taxes 5 3 2 Foreign income taxed at rates other than statutory 2 11 4 Legislative changes (10) 1 126 Joint venture equity income (3) (6) (6) U.S. tax impact on non-U.S. earnings — — 4 Nondeductible expenses 11 16 8 Tax credits (8) (11) (9) Valuation allowances 10 (7) (40) Tax audit adjustments 5 — — Other (2) (4) (8) Income tax expense $ 78 $ 82 $ 149
Reconciliation of Unrecognized Tax Benefits	A reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period is as follows (in millions): 2020 2019 2018 Balance at beginning of the period $ 276 $ 261 $ 269 Additions to tax positions recorded during the current year 4 11 — Additions to tax positions recorded during the prior year 5 9 — Reductions to tax position recorded in prior years (1) — (6) Reductions to tax positions due to lapse of statutory limits (4) (4) (1) Translation, other 3 (1) (1) Balance at end of the period $ 283 $ 276 $ 261

CONTINGENCIES (Tables)

CONTINGENCIES (Tables)	12 Months Ended
	Sep. 30, 2020
Commitments and Contingencies Disclosure [Abstract]
Schedule of Environmental Loss Contingencies by Site	The following are the components of the Superfund and non-Superfund environmental reserves (in millions): Superfund Non-Superfund Total Balance at September 30, 2019 $ 11 $ 4 $ 15 Payments and other (4) (1) (5) Accruals 4 2 6 Balance at September 30, 2020 $ 11 $ 5 $ 16
Asbestos Related Reserves and Recoveries	The Rockwell legacy asbestos-related reserves and corresponding asbestos-related recoveries are summarized as follows (in millions): September 30, 2020 2019 Pending and future claims $ 78 $ 91 Billed but unpaid claims 1 2 Asbestos-related liabilities $ 79 $ 93 Asbestos-related insurance recoveries $ 62 $ 61

BUSINESS SEGMENT INFORMATION (T

BUSINESS SEGMENT INFORMATION (Tables)	12 Months Ended
	Sep. 30, 2020
Segment Reporting [Abstract]
Summary of Segment Information	Segment information is summarized as follows (in millions): Commercial Truck Aftermarket and Industrial Elims Total Fiscal year 2020 Sales: External Sales $ 2,080 $ 964 $ — $ 3,044 Intersegment Sales 110 17 (127) — Total Sales $ 2,190 $ 981 $ (127) $ 3,044 Fiscal year 2019 Sales (1) : External Sales $ 3,307 $ 1,081 $ — $ 4,388 Intersegment Sales 149 19 (168) — Total Sales $ 3,456 $ 1,100 $ (168) $ 4,388 Fiscal year 2018 Sales (1) : External Sales $ 3,171 $ 1,007 $ — $ 4,178 Intersegment Sales 154 17 (171) — Total Sales $ 3,325 $ 1,024 $ (171) $ 4,178 (1) Fiscal years 2019 and 2018 have been recast to reflect reportable segment changes.
Segment Income Attributable to Parent	Year Ended September 30, 2020 2019 2018 Segment adjusted EBITDA: Commercial Truck (1) $ 116 $ 342 $ 345 Aftermarket and Industrial (1) 150 175 142 Segment adjusted EBITDA 266 517 487 Unallocated legacy and corporate income (expense), net (2) 6 3 (13) Interest expense, net (66) (57) (67) Gain on sale of equity investment — — — Provision for income taxes (78) (82) (149) Depreciation and amortization (101) (87) (84) Loss on sale of receivables (4) (6) (5) Restructuring costs (27) (8) (6) Transaction costs (5) (6) — Asbestos related items (3) — 31 (25) Pension settlement loss (4) — — (6) Asset impairment charges (8) (10) (3) Income from WABCO distribution termination 265 — — Noncontrolling interests (4) (5) (9) Income from continuing operations attributable to Meritor, Inc. $ 244 $ 290 $ 120 (1) Fiscal years 2019 and 2018 have been rec ast to reflect reportable segment changes. (2) Unallocated legacy and corporate income (expense), net represents items that are not directly related to the company's business segments. These items primarily include asbestos-related charges and settlements, pension and retiree medical costs associated with sold businesses, and other legacy costs for environmental and product liability. (3) The year ended September 30, 2019 includes $31 million related to the remeasurement of the Maremont net asbestos liability based on the Plan. The year ended September 30, 2018 includes $25 million related to the change in estimate resulting from change in estimated forecast horizon and an asbestos insurance settlement. (4) The year ended September 30, 2018 includes $6 million related to the U.K. pension settlement loss.
Schedule of Segment Assets	Year ended September 30, 2020 2019 (1) 2018 (1) Depreciation and Amortization: Commercial Truck $ 76 $ 73 $ 72 Aftermarket and Industrial 25 14 12 Total depreciation and amortization $ 101 $ 87 $ 84 Capital Expenditures: Commercial Truck $ 68 $ 88 $ 88 Aftermarket and Industrial 17 15 16 Total capital expenditures $ 85 $ 103 $ 104 September 30, 2020 2019 (2) Segment Assets: Commercial Truck $ 1,666 $ 1,745 Aftermarket and Industrial 658 729 Total segment assets 2,324 2,474 Corporate (3) 714 567 Less: Accounts receivable sold under off-balance sheet factoring programs (4) (154) (226) Total assets $ 2,884 $ 2,815 (1) Fiscal years 2019 and 2018 have been recast to reflect reportable segment changes. (2) Amounts as of September 30, 2019 have been recast to reflect reportable segment changes, including the reallocation of goodwill. (3) Corporate assets consist primarily of cash, deferred income taxes and prepaid pension costs.
Schedule of Revenues and Assets by Geographical Areas	Sales by geographic area are based on the location of the selling unit. Information on the company’s geographic areas is summarized as follows (in millions): Year ended September 30, 2020 2019 2018 Sales by Geographic Area: U.S. $ 1,783 $ 2,622 $ 2,289 Canada 54 69 72 Mexico 147 249 221 Total North America 1,984 2,940 2,582 Sweden 202 276 311 Italy 166 234 243 United Kingdom 114 165 179 Other Europe 139 91 103 Total Europe 621 766 836 Brazil 172 248 224 China 135 153 196 India 72 197 231 Other Asia-Pacific 60 84 109 Total sales $ 3,044 $ 4,388 $ 4,178 September 30, 2020 2019 Assets by Geographic Area: U.S. $ 1,458 $ 1,504 Canada 35 39 Mexico 190 197 Total North America 1,683 1,740 Sweden 136 130 Italy 111 81 United Kingdom 270 241 Other Europe 269 173 Total Europe 786 625 Brazil 132 187 China 130 124 India 76 84 Other Asia-Pacific 77 55 Total $ 2,884 $ 2,815

QUARTERLY FINANCIAL INFORMATI_2

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Tables)	12 Months Ended
	Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract]
Summary of Unaudited Quarterly Results	The following is a condensed summary of the company’s unaudited quarterly results of continuing operations for fiscal years 2020 and 2019. Per share amounts are based on the weighted average shares outstanding for that quarter. Earnings per share for the year may not equal the sum of the four fiscal quarters’ earnings per share due to changes in basic and diluted shares outstanding. 2020 Fiscal Quarters (Unaudited) First Second Third Fourth 2020 (In millions, except share related data) Sales $ 901 $ 871 $ 514 $ 758 $ 3,044 Cost of sales (774) (757) (486) (699) (2,716) Gross margin 127 114 28 59 328 Benefit (provision) for income taxes (13) (73) 13 (5) (78) Net income (loss) 41 242 (34) — 249 Net income (loss) from continuing operations attributable to Meritor, Inc. 39 240 (36) 1 244 Net income (loss) attributable to Meritor, Inc. 39 241 (36) 1 245 Basic earnings (loss) per share from continuing operations $ 0.50 $ 3.27 $ (0.50) $ 0.01 $ 3.30 Diluted earnings (loss) per share from continuing operations $ 0.48 $ 3.19 $ (0.50) $ 0.01 $ 3.23 2019 Fiscal Quarters (Unaudited) First Second Third Fourth 2019 (In millions, except share related data) Sales $ 1,038 $ 1,156 $ 1,166 $ 1,028 $ 4,388 Cost of sales (897) (982) (987) (882) (3,748) Gross margin 141 174 179 146 640 Provision for income taxes (21) (27) (21) (13) (82) Net income 92 74 89 41 296 Net income from continuing operations attributable to Meritor, Inc. 90 73 85 42 290 Net income attributable to Meritor, Inc. 90 72 86 43 291 Basic earnings per share from continuing operations $ 1.06 $ 0.88 $ 1.02 $ 0.51 $ 3.49 Diluted earnings per share from continuing operations $ 1.03 $ 0.85 $ 0.99 $ 0.50 $ 3.36

OPERATING CASH FLOWS AND OTHE_2

OPERATING CASH FLOWS AND OTHER SUPPLEMENTAL FINANCIAL INFORMATION (Tables)	12 Months Ended
	Sep. 30, 2020
Operating Cash Flow Disclosure [Abstract]
Schedule of Operating Cash Flows	Year Ended September 30, 2020 2019 2018 (in millions) OPERATING ACTIVITIES Net income $ 249 $ 296 $ 126 Less: Income (loss) from discontinued operations, net of tax 1 1 (3) Income from continuing operations 248 295 129 Adjustments to income from continuing operations to arrive at cash provided by operating activities: Depreciation and amortization 101 87 84 Deferred income tax expense 38 40 74 Restructuring costs 27 8 6 Loss on debt extinguishment — — 8 Asset impairment 8 10 3 Equity in earnings of affiliates (14) (31) (27) Stock compensation expense 7 18 20 Provision for doubtful accounts — — (1) Pension and retiree medical income (42) (37) (31) Pension settlement loss — — 6 Asbestos related liability remeasurement — (31) — Contribution to Maremont trust — (48) — Dividends received from equity method investments 10 23 17 Pension and retiree medical contributions (15) (16) (21) Restructuring payments (25) (5) (8) Changes in off-balance sheet receivable securitization and factoring programs (77) (18) 11 Changes in assets and liabilities, excluding effects of acquisitions, divestitures, foreign currency adjustments and discontinued operations: Receivables 147 80 (98) Inventories 100 9 (112) Accounts payable (186) (103) 97 Other current assets and liabilities (64) (3) 36 Other assets and liabilities 2 (22) 59 Operating cash flows provided by continuing operations 265 256 252 Operating cash flows used for discontinued operations — — (1) CASH PROVIDED BY OPERATING ACTIVITIES $ 265 $ 256 $ 251
Schedule of Supplemental Disclosures	September 30, 2020 2019 2018 (In millions) Balance sheet data: Allowance for doubtful accounts $ 3 $ 3 $ 4 Statement of operations data: Maintenance and repairs expense 47 55 52 Research, development and engineering expense 74 75 73 Depreciation expense 87 76 74 Rental expense 19 19 18 Interest income 4 4 3 Interest expense (70) (61) (70) Statement of cash flows data: Interest payments, net of receipts 48 41 49 Income tax payments, net of refunds 55 64 33 Non-cash investing activities - capital asset additions from finance leases — — 4
Schedule of Cash Flow, Supplemental Disclosures	OPERATING CASH FLOWS AND OTHER SUPPLEMENTAL FINANCIAL INFORMATION Year Ended September 30, 2020 2019 2018 (in millions) OPERATING ACTIVITIES Net income $ 249 $ 296 $ 126 Less: Income (loss) from discontinued operations, net of tax 1 1 (3) Income from continuing operations 248 295 129 Adjustments to income from continuing operations to arrive at cash provided by operating activities: Depreciation and amortization 101 87 84 Deferred income tax expense 38 40 74 Restructuring costs 27 8 6 Loss on debt extinguishment — — 8 Asset impairment 8 10 3 Equity in earnings of affiliates (14) (31) (27) Stock compensation expense 7 18 20 Provision for doubtful accounts — — (1) Pension and retiree medical income (42) (37) (31) Pension settlement loss — — 6 Asbestos related liability remeasurement — (31) — Contribution to Maremont trust — (48) — Dividends received from equity method investments 10 23 17 Pension and retiree medical contributions (15) (16) (21) Restructuring payments (25) (5) (8) Changes in off-balance sheet receivable securitization and factoring programs (77) (18) 11 Changes in assets and liabilities, excluding effects of acquisitions, divestitures, foreign currency adjustments and discontinued operations: Receivables 147 80 (98) Inventories 100 9 (112) Accounts payable (186) (103) 97 Other current assets and liabilities (64) (3) 36 Other assets and liabilities 2 (22) 59 Operating cash flows provided by continuing operations 265 256 252 Operating cash flows used for discontinued operations — — (1) CASH PROVIDED BY OPERATING ACTIVITIES $ 265 $ 256 $ 251 September 30, 2020 2019 2018 (In millions) Balance sheet data: Allowance for doubtful accounts $ 3 $ 3 $ 4 Statement of operations data: Maintenance and repairs expense 47 55 52 Research, development and engineering expense 74 75 73 Depreciation expense 87 76 74 Rental expense 19 19 18 Interest income 4 4 3 Interest expense (70) (61) (70) Statement of cash flows data: Interest payments, net of receipts 48 41 49 Income tax payments, net of refunds 55 64 33 Non-cash investing activities - capital asset additions from finance leases — — 4

SIGNIFICANT ACCOUNTING POLICI_4

SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details) - $ / shares	Dec. 01, 2019	Dec. 01, 2018	Dec. 01, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Nov. 30, 2019	Nov. 30, 2018	Nov. 30, 2017
Restricted Stock Units (RSUs)
Significant Accounting Policies [Line Items]
Shares granted in period (in shares)				600,000	500,000	400,000
Vesting term				3 years
Executive Officer
Significant Accounting Policies [Line Items]
Number of shares issuable per performance share unit (in shares)									1
Executive Officer | Performance Shares
Significant Accounting Policies [Line Items]
Number of shares issuable per performance share unit (in shares)							1	1
Exercise price (in dollars per share)	$ 25.25	$ 16.50	$ 24.79
Executive Officer | Performance Shares | Performance period of October 1, 2019 to September 30, 2022
Significant Accounting Policies [Line Items]
Performance period	3 years
Shares authorized for grant (in shares)	400,000
Executive Officer | Performance Shares | Performance period of October 1, 2019 to September 30, 2022 | Minimum
Significant Accounting Policies [Line Items]
Performance-based vesting percentage	0.00%
Executive Officer | Performance Shares | Performance period of October 1, 2019 to September 30, 2022 | Maximum
Significant Accounting Policies [Line Items]
Performance-based vesting percentage	200.00%
Executive Officer | Performance Shares | Performance period of October 1, 2019 to September 30, 2022 | Performance Objective One
Significant Accounting Policies [Line Items]
Award vesting rights percentage	25.00%
Executive Officer | Performance Shares | Performance period of October 1, 2018 to September 30, 2021
Significant Accounting Policies [Line Items]
Performance period		3 years
Shares authorized for grant (in shares)		500,000
Executive Officer | Performance Shares | Performance period of October 1, 2018 to September 30, 2021 | Minimum
Significant Accounting Policies [Line Items]
Performance-based vesting percentage		0.00%
Executive Officer | Performance Shares | Performance period of October 1, 2018 to September 30, 2021 | Maximum
Significant Accounting Policies [Line Items]
Performance-based vesting percentage		200.00%
Executive Officer | Performance Shares | Performance period of October 1, 2018 to September 30, 2021 | Performance Objective One
Significant Accounting Policies [Line Items]
Award vesting rights percentage		50.00%
Executive Officer | Performance Shares | Performance period of October 1, 2018 to September 30, 2021 | Performance Objective Two
Significant Accounting Policies [Line Items]
Award vesting rights percentage		50.00%
Executive Officer | Performance Shares | Performance period of October 1, 2017 to September 30, 2020
Significant Accounting Policies [Line Items]
Performance period			3 years
Executive Officer | Restricted Stock Units (RSUs)
Significant Accounting Policies [Line Items]
Exercise price (in dollars per share)			$ 24.79
Shares granted in period (in shares)	300,000	400,000	300,000
Vesting term	3 years	3 years	3 years
Ten Customers | Customer Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Concentration risk from significant customers, percentage				69.00%	77.00%	75.00%
Three Customers | Customer Concentration Risk | Sales
Significant Accounting Policies [Line Items]
Concentration risk from significant customers, percentage				50.00%	54.00%	52.00%
Three Customers | Customer Concentration Risk | Trade Accounts Receivable
Significant Accounting Policies [Line Items]
Concentration risk from significant customers, percentage				25.00%	26.00%

SIGNIFICANT ACCOUNTING POLICI_5

SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of Average Common Shares (Details) - shares shares in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Accounting Policies [Abstract]
Basic average common shares outstanding (in shares)	74	83.2	87.5
Impact of restricted shares, restricted share units and performance share units (in shares)	0.8	2.2	2.8
Impact of convertible notes (in shares)	0.8	0.9	0.9
Diluted average common shares outstanding (in shares)	75.6	86.3	91.2

ACQUISITIONS AND DIVESTITURE -

ACQUISITIONS AND DIVESTITURE - Additional Information (Details) - USD ($) $ in Millions	Sep. 30, 2020	Mar. 13, 2020	Jan. 16, 2020	Sep. 30, 2019	Jul. 26, 2019	Apr. 30, 2018	Mar. 31, 2020	Sep. 30, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Increase to goodwill									$ 5	$ 3
Goodwill	$ 501			$ 478					501	478	$ 421
Purchase price of sale									0	0	250
Income from WABCO distribution termination									265	0	$ 0
Meritor WABCO JV | WABCO Holdings Inc.
Business Acquisition [Line Items]
Purchase price of sale								$ 250
Distribution rights, term (up to)								10 years
Income from WABCO distribution termination		$ 265					$ 265
Meritor WABCO JV | WABCO Holdings Inc. | Minimum
Business Acquisition [Line Items]
WABCO termination period (in years)								3 years 6 months
Contract termination expense								$ 225
Meritor WABCO JV | WABCO Holdings Inc. | Maximum
Business Acquisition [Line Items]
Contract termination expense								$ 265
TransPower
Business Acquisition [Line Items]
Percentage of voting equity interest acquired			100.00%
Purchase price			$ 15						15
Investments in TransPower			12						12
Various tangible assets acquired and liabilities assumed	9		$ 10						9
AxleTech
Business Acquisition [Line Items]
Percentage of voting equity interest acquired					100.00%
Purchase price	177			179	$ 179
Measurement period adjustments to decrease in fair value									5
Increase to goodwill									5
Acquisition related costs incurred									1	6
Various tangible assets acquired and liabilities assumed	$ 33			$ 26					$ 33	$ 26
AAG
Business Acquisition [Line Items]
Purchase price						$ 35
Various tangible assets acquired and liabilities assumed						11
Amortizable intangibles acquired						12
Goodwill						$ 12

ACQUISITIONS AND DIVESTITURE _2

ACQUISITIONS AND DIVESTITURE - Pro Forma Financial Information (Details) - TransPower - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Business Acquisition [Line Items]
Sales	$ 3,045	$ 4,394
Net income attributable to Meritor, Inc.	$ 244	$ 282

ACQUISITIONS AND DIVESTITURE _3

ACQUISITIONS AND DIVESTITURE - Purchase Price Allocation (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jan. 16, 2020	Sep. 30, 2019	Jul. 26, 2019	Sep. 30, 2020	Sep. 30, 2020
TransPower
Business Acquisition [Line Items]
Purchase price		$ 15				$ 15
Investments in TransPower		12				12
Total		27				27
Assets acquired and liabilities assumed:
Cash	$ 2	2			$ 2	2
Receivables, net	5	5			5	5
Inventories, net	8	8			8	8
Identifiable intangible assets	11	0			11	11
Other assets	(1)	0			(1)	(1)
PP&E	9	10			9	9
Accounts payable	(3)	(3)			(3)	(3)
Other current liabilities	(17)	(17)			(17)	(17)
Total identifiable net assets acquired	14	5			14	14
Goodwill and other intangible assets resulting from the acquisition	13	22			13	13
Identifiable net assets and goodwill acquired	27	$ 27			27	27
Measurement Period Adjustments
Purchase price					0
Investments in TransPower					0
Total					0
Cash					0
Receivables, net					0
Inventories, net					0
PP&E					(1)
Identifiable intangible assets					11
Other assets					(1)
Accounts payable					0
Other current liabilities					0
Total identifiable net assets acquired					9
Goodwill and other intangible assets resulting from the acquisition					(9)
Identifiable net assets and goodwill acquired					0
AxleTech
Business Acquisition [Line Items]
Purchase price	177		$ 179	$ 179
Assets acquired and liabilities assumed:
Cash	11		11		11	11
Receivables, net	35		37		35	35
Inventories, net	68		70		68	68
Identifiable intangible assets	53		46		53	53
Other assets	8		9		8	8
PP&E	33		26		33	33
Accounts payable	(32)		(33)		(32)	(32)
Other current liabilities	(65)		(48)		(65)	(65)
Total identifiable net assets acquired	111		118		111	111
Goodwill and other intangible assets resulting from the acquisition	66		61		66	66
Identifiable net assets and goodwill acquired	$ 177		$ 179		$ 177	177
Measurement Period Adjustments
Purchase price						(2)
Cash						0
Receivables, net						(2)
Inventories, net						(2)
PP&E						7
Identifiable intangible assets						7
Other assets						(1)
Accounts payable						1
Other current liabilities						(17)
Total identifiable net assets acquired						(7)
Goodwill and other intangible assets resulting from the acquisition						5
Identifiable net assets and goodwill acquired						$ (2)

LEASES - Schedule of Lease Cost

LEASES - Schedule of Lease Cost (Details) $ in Millions	12 Months Ended
	Sep. 30, 2020USD ($)
Leases [Abstract]
Finance lease costs	$ 3
Operating lease costs	20
Total lease costs	$ 23

LEASES - Leases in Condensed Co

LEASES - Leases in Condensed Consolidated Balance Sheet (Details) $ in Millions	Sep. 30, 2020USD ($)
Finance Lease Assets And Liabilities Lessee
Finance lease right-of-use assets, Net Property	$ 5
Finance lease right-of-use assets, Balance Sheet [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Finance lease liabilities, Short-term debt	$ 3
Finance lease liabilities, current, Balance Sheet [Extensible List]	us-gaap:DebtCurrent
Finance lease liabilities, Long-term debt	$ 3
Finance lease liabilities, noncurrent, Balance Sheet [Extensible List]	us-gaap:LongTermDebtAndCapitalLeaseObligations
Operating Lease Assets And Liabilities Lessee
Operating lease right-of-use assets, Other assets	$ 70
Operating lease right-of-use assets, Balance Sheet [Extensible List]	us-gaap:OtherAssetsNoncurrent
Operating lease liabilities, Other current liabilities	$ 15
Operating lease liabilities, current, Balance Sheet [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Operating lease liabilities, Other liabilities	$ 59
Operating lease liabilities, noncurrent, Balance Sheet [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent

LEASES - Supplemental Cash Flow

LEASES - Supplemental Cash Flow Information (Details) $ in Millions	12 Months Ended
	Sep. 30, 2020USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used for operating leases	$ 19
Financing cash flows used for finance leases	2
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	8
Finance leases	$ 3

LEASES - Supplemental Balance S

LEASES - Supplemental Balance Sheet Information (Details)	Sep. 30, 2020
Weighted-average remaining lease term (years):
Operating leases	8 years 6 months 18 days
Finance leases	2 years 2 months 15 days
Weighted-average discount rate:
Operating leases	4.50%
Finance leases	5.00%

LEASES - Maturities of Operatin

LEASES - Maturities of Operating and Finance Lease Liabilities (Details) $ in Millions	Sep. 30, 2020USD ($)
Operating Leases
2021	$ 17
2022	14
2023	13
2024	9
Thereafter	40
Total lease payments	93
Less: Impact of discounting future lease payments	(19)
Present value of lease liabilities	74
Finance Leases
2021	3
2022	2
2023	1
2024	0
Thereafter	0
Total lease payments	6
Less: Impact of discounting future lease payments	0
Present value of lease liabilities	$ 6

LEASES - Future Minimum Rental

LEASES - Future Minimum Rental Commitments Prior to Adoption of ASU 2016-02 (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201602Member
2021		$ 18
2022		15
2023		14
2024		13
2025		13
Thereafter		25
Total		$ 98

REVENUE (Details)

REVENUE (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Sales	$ 758	$ 514	$ 871	$ 901	$ 1,028	$ 1,166	$ 1,156	$ 1,038	$ 3,044	$ 4,388	$ 4,178
Trade receivables, net	$ 421				$ 517				421	517
U.S.
Disaggregation of Revenue [Line Items]
Sales									1,783	2,622	2,289
Canada
Disaggregation of Revenue [Line Items]
Sales									54	69	72
Mexico
Disaggregation of Revenue [Line Items]
Sales									147	249	221
Total North America
Disaggregation of Revenue [Line Items]
Sales									1,984	2,940	2,582
Sweden
Disaggregation of Revenue [Line Items]
Sales									202	276	311
Italy
Disaggregation of Revenue [Line Items]
Sales									166	234	243
United Kingdom
Disaggregation of Revenue [Line Items]
Sales									114	165	179
Other Europe
Disaggregation of Revenue [Line Items]
Sales									139	91
Total Europe
Disaggregation of Revenue [Line Items]
Sales									621	766	836
Brazil
Disaggregation of Revenue [Line Items]
Sales									172	248	224
China
Disaggregation of Revenue [Line Items]
Sales									135	153	196
India
Disaggregation of Revenue [Line Items]
Sales									72	197	$ 231
Other Asia-Pacific
Disaggregation of Revenue [Line Items]
Sales									60	84
Commercial Truck
Disaggregation of Revenue [Line Items]
Sales									2,080	3,307
Commercial Truck | U.S.
Disaggregation of Revenue [Line Items]
Sales									1,052	1,737
Commercial Truck | Canada
Disaggregation of Revenue [Line Items]
Sales									0	0
Commercial Truck | Mexico
Disaggregation of Revenue [Line Items]
Sales									129	229
Commercial Truck | Total North America
Disaggregation of Revenue [Line Items]
Sales									1,181	1,966
Commercial Truck | Sweden
Disaggregation of Revenue [Line Items]
Sales									202	276
Commercial Truck | Italy
Disaggregation of Revenue [Line Items]
Sales									153	218
Commercial Truck | United Kingdom
Disaggregation of Revenue [Line Items]
Sales									105	155
Commercial Truck | Other Europe
Disaggregation of Revenue [Line Items]
Sales									5	10
Commercial Truck | Total Europe
Disaggregation of Revenue [Line Items]
Sales									465	659
Commercial Truck | Brazil
Disaggregation of Revenue [Line Items]
Sales									170	248
Commercial Truck | China
Disaggregation of Revenue [Line Items]
Sales									134	153
Commercial Truck | India
Disaggregation of Revenue [Line Items]
Sales									70	197
Commercial Truck | Other Asia-Pacific
Disaggregation of Revenue [Line Items]
Sales									60	84
Aftermarket and Industrial
Disaggregation of Revenue [Line Items]
Sales									964	1,081
Aftermarket and Industrial | U.S.
Disaggregation of Revenue [Line Items]
Sales									731	885
Aftermarket and Industrial | Canada
Disaggregation of Revenue [Line Items]
Sales									54	69
Aftermarket and Industrial | Mexico
Disaggregation of Revenue [Line Items]
Sales									18	20
Aftermarket and Industrial | Total North America
Disaggregation of Revenue [Line Items]
Sales									803	974
Aftermarket and Industrial | Sweden
Disaggregation of Revenue [Line Items]
Sales									0	0
Aftermarket and Industrial | Italy
Disaggregation of Revenue [Line Items]
Sales									13	16
Aftermarket and Industrial | United Kingdom
Disaggregation of Revenue [Line Items]
Sales									9	10
Aftermarket and Industrial | Other Europe
Disaggregation of Revenue [Line Items]
Sales									134	81
Aftermarket and Industrial | Total Europe
Disaggregation of Revenue [Line Items]
Sales									156	107
Aftermarket and Industrial | Brazil
Disaggregation of Revenue [Line Items]
Sales									2	0
Aftermarket and Industrial | China
Disaggregation of Revenue [Line Items]
Sales									1	0
Aftermarket and Industrial | India
Disaggregation of Revenue [Line Items]
Sales									2	0
Aftermarket and Industrial | Other Asia-Pacific
Disaggregation of Revenue [Line Items]
Sales									$ 0	$ 0

GOODWILL (Details)

GOODWILL (Details) $ in Millions	12 Months Ended
	Sep. 30, 2020USD ($)unit	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)
Goodwill [Line Items]
Goodwill			$ 436
Accumulated impairment losses			(15)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 478	$ 421
Measurement period adjustment	5	3
Goodwill acquired from acquisition (see Note 3)	13	61
Foreign currency translation	5	(7)
Goodwill, ending balance	$ 501	478
Commercial Truck
Goodwill [Line Items]
Number of reporting units | unit	1
Goodwill			289
Accumulated impairment losses			0
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 287	289
Measurement period adjustment	0	3
Goodwill acquired from acquisition (see Note 3)	13	0
Foreign currency translation	4	(5)
Goodwill, ending balance	$ 304	287
Aftermarket and Industrial
Goodwill [Line Items]
Number of reporting units | unit	2
Goodwill			147
Accumulated impairment losses			$ (15)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 191	132
Measurement period adjustment	5	0
Goodwill acquired from acquisition (see Note 3)	0	61
Foreign currency translation	1	(2)
Goodwill, ending balance	$ 197	$ 191

RESTRUCTURING COSTS - Additiona

RESTRUCTURING COSTS - Additional Information (Details) $ in Millions

Nov. 11, 2020USD ($)plantofficeposition

Jun. 30, 2020USD ($)

Mar. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Sep. 30, 2019USD ($)

Jun. 30, 2019USD ($)

Mar. 31, 2019USD ($)

Sep. 30, 2020USD ($)

Sep. 30, 2019USD ($)

Sep. 30, 2018USD ($)

Jun. 02, 2020USD ($)

Sep. 27, 2019USD ($)

Jul. 29, 2019USD ($)

Sep. 30, 2017USD ($)

Restructuring Cost and Reserve [Line Items]

Restructuring reserve

$ 8

$ 10

$ 8

$ 4

$ 6

Restructuring costs

$ 12

$ 10

$ 5

10

$ 1

$ 1

27

8

6

Footprint Actions | Subsequent Event

Restructuring Cost and Reserve [Line Items]

Number of positions expected to be eliminated | position

150

Footprint Actions | Aftermarket and Industrial | Subsequent Event

Restructuring Cost and Reserve [Line Items]

Restructuring costs expected to incur

$ 19

Footprint Actions | Aftermarket and Industrial | Subsequent Event | U.S.

Restructuring Cost and Reserve [Line Items]

Expected number of facilities to close | plant

3

Footprint Actions | Aftermarket and Industrial | Subsequent Event | Total Europe

Restructuring Cost and Reserve [Line Items]

Expected number of facilities to close | office

1

Other

Restructuring Cost and Reserve [Line Items]

Restructuring costs

2

(2)

3

Other | Aftermarket and Industrial

Restructuring Cost and Reserve [Line Items]

Restructuring costs

3

Global Restructuring Program 2020

Restructuring Cost and Reserve [Line Items]

Restructuring costs

10

Global Restructuring Program 2020 | Aftermarket and Industrial

Restructuring Cost and Reserve [Line Items]

Restructuring costs

3

Global Restructuring Program 2020 | Commercial Truck

Restructuring Cost and Reserve [Line Items]

Restructuring costs

7

Global Restructuring Program 2019

Restructuring Cost and Reserve [Line Items]

Restructuring costs

13

7

Global Restructuring Program 2019 | Aftermarket and Industrial

Restructuring Cost and Reserve [Line Items]

Restructuring costs

1

2

Global Restructuring Program 2019 | Commercial Truck

Restructuring Cost and Reserve [Line Items]

Restructuring costs

6

11

AxleTech

Restructuring Cost and Reserve [Line Items]

Restructuring costs

2

3

AxleTech | Aftermarket and Industrial

Restructuring Cost and Reserve [Line Items]

Restructuring costs expected to incur

$ 11

Restructuring costs

2

AxleTech | Commercial Truck

Restructuring Cost and Reserve [Line Items]

Restructuring costs

0

Segment Realignment Program

Restructuring Cost and Reserve [Line Items]

Restructuring costs

3

Segment Realignment Program | Aftermarket and Industrial

Restructuring Cost and Reserve [Line Items]

Restructuring costs

3

Asset Impairment | Footprint Actions | Aftermarket and Industrial | Subsequent Event

Restructuring Cost and Reserve [Line Items]

Restructuring costs expected to incur

$ 9

Asset Impairment | AxleTech | Aftermarket and Industrial

Restructuring Cost and Reserve [Line Items]

Restructuring costs expected to incur

4

Employee Termination Benefits

Restructuring Cost and Reserve [Line Items]

Restructuring reserve

8

10

8

4

$ 5

Restructuring costs

27

$ 8

$ 6

Employee Termination Benefits | Footprint Actions | Aftermarket and Industrial | Subsequent Event

Restructuring Cost and Reserve [Line Items]

Restructuring costs expected to incur

5

Employee Termination Benefits | Global Restructuring Program 2020

Restructuring Cost and Reserve [Line Items]

Restructuring costs expected to incur

$ 25

Percentage of global salaried positions affected

8.00%

Employee Termination Benefits | Global Restructuring Program 2019

Restructuring Cost and Reserve [Line Items]

Restructuring costs expected to incur

$ 26

Employee Termination Benefits | AxleTech | Aftermarket and Industrial

Restructuring Cost and Reserve [Line Items]

Restructuring costs expected to incur

$ 7

Restructuring costs

$ 3

$ 2

Other | Footprint Actions | Aftermarket and Industrial | Subsequent Event

Restructuring Cost and Reserve [Line Items]

Restructuring costs expected to incur

$ 5

RESTRUCTURING COSTS - Changes i

RESTRUCTURING COSTS - Changes in Restructuring Reserves (Details) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Restructuring reserve, period start			$ 8				$ 8	$ 4	$ 6
Charges to continuing operations	$ 12	$ 10	5	$ 10	$ 1	$ 1	27	8	6
Cash payments – continuing operations							(25)	(5)	(8)
Other								1
Restructuring reserve, period end				8			10	8	4
Less: non-current restructuring reserves							0
Restructuring reserves – current							10
Employee Termination Benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, period start			8				8	4	5
Charges to continuing operations							27	8	6
Cash payments – continuing operations							(25)	(5)	(7)
Other								1
Restructuring reserve, period end				8			10	8	4
Less: non-current restructuring reserves							0
Restructuring reserves – current							10
Plant Shutdown & Other
Restructuring Reserve [Roll Forward]
Restructuring reserve, period start			$ 0				0	0	1
Charges to continuing operations							0	0	0
Cash payments – continuing operations							0	0	(1)
Other								0
Restructuring reserve, period end				$ 0			0	$ 0	$ 0
Less: non-current restructuring reserves							0
Restructuring reserves – current							$ 0

RESTRUCTURING COSTS - Restructu

RESTRUCTURING COSTS - Restructuring Expense Recognized By Segment (Details) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring costs	$ 12	$ 10	$ 5	$ 10	$ 1	$ 1	$ 27	$ 8	$ 6
Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs							0	0	1
Commercial Truck | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs							19	5	1
Aftermarket and Industrial | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs							8	3	4
Global Restructuring Program 2020
Restructuring Cost and Reserve [Line Items]
Restructuring costs							10
Global Restructuring Program 2020 | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs							0
Global Restructuring Program 2020 | Commercial Truck
Restructuring Cost and Reserve [Line Items]
Restructuring costs							7
Global Restructuring Program 2020 | Commercial Truck | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs							7
Global Restructuring Program 2020 | Aftermarket and Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs							3
Global Restructuring Program 2020 | Aftermarket and Industrial | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs							3
Global Restructuring Program 2019
Restructuring Cost and Reserve [Line Items]
Restructuring costs							13	7
Global Restructuring Program 2019 | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs							0	0
Global Restructuring Program 2019 | Commercial Truck
Restructuring Cost and Reserve [Line Items]
Restructuring costs				6			11
Global Restructuring Program 2019 | Commercial Truck | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs							11	6
Global Restructuring Program 2019 | Aftermarket and Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs				$ 1			2
Global Restructuring Program 2019 | Aftermarket and Industrial | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs							2	1
AxleTech
Restructuring Cost and Reserve [Line Items]
Restructuring costs							2	3
AxleTech | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs							0	0
AxleTech | Commercial Truck
Restructuring Cost and Reserve [Line Items]
Restructuring costs							0
AxleTech | Commercial Truck | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs								0
AxleTech | Aftermarket and Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs							2
AxleTech | Aftermarket and Industrial | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs								3
Other
Restructuring Cost and Reserve [Line Items]
Restructuring costs							2	(2)	3
Other | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs							0	0	1
Other | Commercial Truck | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs							1	(1)	1
Other | Aftermarket and Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs									3
Other | Aftermarket and Industrial | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs							$ 1	$ (1)	1
Segment Realignment Program
Restructuring Cost and Reserve [Line Items]
Restructuring costs									3
Segment Realignment Program | Corporate
Restructuring Cost and Reserve [Line Items]
Restructuring costs									0
Segment Realignment Program | Commercial Truck | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs									0
Segment Realignment Program | Aftermarket and Industrial
Restructuring Cost and Reserve [Line Items]
Restructuring costs									3
Segment Realignment Program | Aftermarket and Industrial | Operating Segments
Restructuring Cost and Reserve [Line Items]
Restructuring costs									$ 3

ACCOUNTS RECEIVABLE FACTORING_3

ACCOUNTS RECEIVABLE FACTORING AND SECURITIZATION (Details) € in Millions	Apr. 20, 2020USD ($)	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2020EUR (€)	Sep. 30, 2019EUR (€)
Accounts Receivable Factoring and Securitization [Line Items]
Maximum limit for securitization financing arrangement		$ 95,000,000
Utilization of securitization financing arrangement		3,000,000	$ 13,000,000
Maximum limit for sale of eligible trade receivables		320,000,000			€ 210
Utilization of accounts receivable factoring facility under arrangement		154,000,000	226,000,000		107	€ 154
Costs associated with off-balance sheet factoring arrangements		4,000,000	6,000,000	$ 5,000,000
Committed U.S. Accounts Receivable Securitization
Accounts Receivable Factoring and Securitization [Line Items]
Maximum limit for securitization financing arrangement	$ 95,000,000	95,000,000	115,000,000
Utilization of securitization financing arrangement		3,000,000	13,000,000
Required ratio of total priority debt to EBITDA through period end	2.25
Outstanding balance under accounts receivable securitization program		0	9,000,000
Committed Swedish Factoring Facility
Accounts Receivable Factoring and Securitization [Line Items]
Maximum limit for sale of eligible trade receivables		181,000,000			155
Utilization of accounts receivable factoring facility under arrangement		$ 100,000,000	119,000,000		86	109
Days of liquidity		364 days
Committed U.S Factoring Facility
Accounts Receivable Factoring and Securitization [Line Items]
Maximum limit for sale of eligible trade receivables		$ 75,000,000
Utilization of accounts receivable factoring facility under arrangement		30,000,000	58,000,000
Uncommitted U.K. Factoring Facility
Accounts Receivable Factoring and Securitization [Line Items]
Maximum limit for sale of eligible trade receivables		29,000,000			25
Utilization of accounts receivable factoring facility under arrangement		1,000,000	6,000,000		1	6
Uncommitted Italy Factoring Facility
Accounts Receivable Factoring and Securitization [Line Items]
Maximum limit for sale of eligible trade receivables		35,000,000			30
Utilization of accounts receivable factoring facility under arrangement		9,000,000	23,000,000		8	21
Other Uncommitted Factoring Facilities
Accounts Receivable Factoring and Securitization [Line Items]
Utilization of accounts receivable factoring facility under arrangement		14,000,000	20,000,000		€ 12	€ 18
Letter of Credit | Committed U.S. Accounts Receivable Securitization
Accounts Receivable Factoring and Securitization [Line Items]
Amount outstanding, letters of credit		$ 3,000,000	$ 4,000,000

INVENTORIES (Details)

INVENTORIES (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Inventory Disclosure [Abstract]
Finished goods	$ 119	$ 153
Work in process	38	39
Raw materials, parts and supplies	278	334
Total	$ 435	$ 526

NET PROPERTY - Additional Infor

NET PROPERTY - Additional Information (Details)	12 Months Ended
	Sep. 30, 2020
Minimum | Buildings
Property, Plant and Equipment [Line Items]
Estimated useful lives of property (in years)	10 years
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives of property (in years)	3 years
Maximum | Buildings
Property, Plant and Equipment [Line Items]
Estimated useful lives of property (in years)	50 years
Maximum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives of property (in years)	25 years
Maximum | Company-owned tooling
Property, Plant and Equipment [Line Items]
Estimated useful lives of property (in years)	3 years

NET PROPERTY - Schedule of Net

NET PROPERTY - Schedule of Net Property (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Line Items]
Property, gross	$ 1,476	$ 1,400
Less: Accumulated depreciation	(961)	(885)
Net property	515	515
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, gross	32	31
Buildings
Property, Plant and Equipment [Line Items]
Property, gross	228	224
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, gross	1,002	935
Company-owned tooling
Property, Plant and Equipment [Line Items]
Property, gross	151	136
Construction in progress
Property, Plant and Equipment [Line Items]
Property, gross	$ 63	$ 74

OTHER ASSETS (Details)

OTHER ASSETS (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Other Assets, Noncurrent [Abstract]
Prepaid pension costs (see Note 20)	$ 179	$ 149
Deferred income tax assets (see Note 21)	30	122
Investments in non-consolidated joint ventures (see Note 12)	107	110
Other	269	225
Other assets	585	606
Finite-Lived Intangible Assets [Line Items]
Investments in non-consolidated joint ventures	107	110
Corporate Joint Venture
Other Assets, Noncurrent [Abstract]
Investments in non-consolidated joint ventures (see Note 12)	65	69
Finite-Lived Intangible Assets [Line Items]
Investments in non-consolidated joint ventures	$ 65	$ 69

INVESTMENTS IN NON-CONSOLIDAT_3

INVESTMENTS IN NON-CONSOLIDATED JOINT VENTURES - Non-Consolidated Joint Ventures and Direct Ownership Interests (Details)	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Master Sistemas Automotivos Ltda.
Schedule of Equity Method Investments [Line Items]
Non-consolidated joint ventures and related direct ownership interest (percent)	49.00%	49.00%	49.00%
Sistemas Automotrices de Mexico S.A. de C.V.
Schedule of Equity Method Investments [Line Items]
Non-consolidated joint ventures and related direct ownership interest (percent)	50.00%	50.00%	50.00%
Ege Fren Sanayii ve Ticaret A.S.
Schedule of Equity Method Investments [Line Items]
Non-consolidated joint ventures and related direct ownership interest (percent)	49.00%	49.00%	49.00%
Automotive Axles Limited
Schedule of Equity Method Investments [Line Items]
Non-consolidated joint ventures and related direct ownership interest (percent)	36.00%	36.00%	36.00%

INVESTMENTS IN NON-CONSOLIDAT_4

INVESTMENTS IN NON-CONSOLIDATED JOINT VENTURES - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]
Investments in non-consolidated joint ventures	$ 107	$ 110
Equity in earnings of affiliates	14	31	$ 27
Dividends/Distributions received from the company's non-consolidated joint ventures	10	23	17
Sales to non-consolidated joint ventures	9	9	7
Sales excluded from non-consolidated joint ventures through intercompany eliminations	92	193	196
Purchases from non-consolidated joint ventures	509	940	843
Lease and services payments from non-consolidated joint ventures	14	12	$ 11
Amounts due from non-consolidated joint ventures	23	34
Amounts due to non-consolidated joint ventures	56	80
Commercial Truck
Schedule of Equity Method Investments [Line Items]
Investments in non-consolidated joint ventures	107	110
Equity in earnings of affiliates	14	31
Automotive Axles Limited
Schedule of Equity Method Investments [Line Items]
Fair value of investment	$ 54	$ 75

INVESTMENTS IN NON-CONSOLIDAT_5

INVESTMENTS IN NON-CONSOLIDATED JOINT VENTURES - Balance Sheet Information Of Non-Consolidated Joint Ventures (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Schedule of Equity Method Investments [Line Items]
Current assets	$ 1,283	$ 1,216
TOTAL ASSETS	2,884	2,815
Current liabilities	726	936
TOTAL LIABILITIES	2,389	2,400
Equity Method Investment
Schedule of Equity Method Investments [Line Items]
Current assets	308	427
Non-current assets	200	211
TOTAL ASSETS	508	638
Current liabilities	209	305
Non-current liabilities	87	109
TOTAL LIABILITIES	$ 296	$ 414

INVESTMENTS IN NON-CONSOLIDAT_6

INVESTMENTS IN NON-CONSOLIDATED JOINT VENTURES - Income Statement Information Of Non-Consolidated Joint Ventures (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Schedule of Equity Method Investments [Line Items]
Sales	$ 758	$ 514	$ 871	$ 901	$ 1,028	$ 1,166	$ 1,156	$ 1,038	$ 3,044	$ 4,388	$ 4,178
Gross profit	59	28	114	127	146	179	174	141	328	640	625
Net income	$ 1	$ (36)	$ 241	$ 39	$ 43	$ 86	$ 72	$ 90	245	291	117
Equity Method Investment
Schedule of Equity Method Investments [Line Items]
Sales									696	1,231	1,101
Gross profit									76	147	154
Net income									$ 30	$ 63	$ 59

OTHER CURRENT LIABILITIES - Sch

OTHER CURRENT LIABILITIES - Schedule of Other Current Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Other Current Liabilities Disclosure [Abstract]
Compensation and benefits	$ 91	$ 125
Income taxes	6	24
Product warranties	19	18	$ 19
Other	148	118
Other current liabilities	$ 264	$ 285

OTHER CURRENT LIABILITIES - S_2

OTHER CURRENT LIABILITIES - Schedule of Product Warranties (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Other Liabilities, Current [Roll Forward]
Total product warranties – beginning of year	$ 50	$ 54	$ 45
Accruals for product warranties	25	23	22
Payments	(19)	(20)	(16)
Change in estimates and other	(2)	(7)	3
Total product warranties – end of year	54	50	54
Less: non-current product warranties (see Note 14)	(35)	(32)	(35)
Product warranties	$ 19	$ 18	$ 19

OTHER LIABILITIES (Details)

OTHER LIABILITIES (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Other Liabilities Disclosure [Abstract]
Asbestos-related liabilities (see Note 22)	$ 67	$ 82
Liabilities for uncertain tax positions (see Note 21)	73	46
Product warranties (see Note 13)	35	32	$ 35
Other	104	66
Other liabilities	$ 279	$ 226

LONG-TERM DEBT - Summary of Lon

LONG-TERM DEBT - Summary of Long-Term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 08, 2020	Sep. 30, 2019	Sep. 22, 2017	Jun. 11, 2015	Feb. 13, 2014
Debt Instrument [Line Items]
Finance lease obligation	$ 6
Finance lease obligation			$ 7
Subtotal	1,227		943
Less: current maturities	(39)		(41)
Long-term debt	1,188		902
6.25% notes due 2024
Debt Instrument [Line Items]
Interest rate (percent)		6.25%
Borrowings and securitization
Debt Instrument [Line Items]
Borrowings and securitization	0		9
Convertible Notes
Debt Instrument [Line Items]
Unamortized discount on convertible notes	(29)		(34)
Unamortized issuance costs	14
Unamortized discount on convertible notes	29		34
Convertible Notes | 3.25% convertible notes due 2037
Debt Instrument [Line Items]
Interest rate (percent)				3.25%
Debt	320		319
Unamortized issuance costs	5		6
Convertible Notes | 7.875% convertible notes due 2026
Debt Instrument [Line Items]
Interest rate (percent)					7.875%
Debt	23		23
Unamortized discount on convertible notes			(1)
Unamortized discount on convertible notes			1
Notes | 6.25% notes due 2025
Debt Instrument [Line Items]
Interest rate (percent)						6.25%
Debt	295		0
Unamortized issuance costs	5
Notes | 6.25% notes due 2024
Debt Instrument [Line Items]
Interest rate (percent)		625.00%
Debt	446		444
Unamortized issuance costs	4		6
Term loan | Term loan due 2024
Debt Instrument [Line Items]
Debt	$ 166		$ 175

LONG-TERM DEBT - Repurchase of

LONG-TERM DEBT - Repurchase of Debt Securities (Details) - Convertible Notes - 4.00% convertible notes due 2027 - USD ($)	Jun. 07, 2019	Feb. 15, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Repurchased principal amount of debt	$ 5,000,000	$ 19,000,000
Interest rate (percent)	400.00%	400.00%	400.00%
Redemption Price	100.00%	100.00%

LONG-TERM DEBT - Current Classi

LONG-TERM DEBT - Current Classification of Notes (Details) - Convertible Notes - 7.875% convertible notes due 2026	Nov. 30, 2020USD ($)	Dec. 31, 2019USD ($)$ / shares	Sep. 30, 2020USD ($)	Sep. 30, 2019USD ($)trading_day$ / shares	Jun. 11, 2015$ / shares	Dec. 31, 2012$ / shares
Debt Instrument [Line Items]
Interest rate (percent)					7.875%
Debt			$ 23,000,000	$ 23,000,000
Redemption Price			100.00%
Conversion price (in dollars per share) | $ / shares						$ 12
Threshold trading days | trading_day				20
Threshold consecutive trading days | trading_day				30
Threshold percentage of stock price trigger (greater than)				120.00%
2022
Debt Instrument [Line Items]
Conversion ratio of common stock per principal		83.3333
Principal amount per note for conversion		$ 1,000
Conversion price (in dollars per share) | $ / shares		$ 12		$ 12	$ 12
2022 | Forecast
Debt Instrument [Line Items]
Conversion ratio of common stock per principal	83.3333
Principal amount per note for conversion	$ 1,000

LONG-TERM DEBT - 6.25 Percent N

LONG-TERM DEBT - 6.25 Percent Notes due 2025 (Details) - USD ($)	Jun. 08, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Repayment amount		$ 304,000,000	$ 190,000,000	$ 55,000,000
6.25% notes due 2025 | Prior to June 1, 2022
Debt Instrument [Line Items]
Redemption Price		106.25%
Senior Notes | 6.25% notes due 2025
Debt Instrument [Line Items]
Interest rate (percent)	6.25%
Debt instrument, face amount	$ 300,000,000
Proceeds from Issuance of Long-term Debt	$ 295,000,000
Redemption Price	100.00%
Premium as a percentage of principal to be earned in the event of redemption	1.00%
Basis spread on variable rate	0.50%
Percentage of principal that may be redeemed		35.00%
Percentage of principal outstanding		65.00%
Senior Notes | 6.25% notes due 2025 | Prior to June 1, 2022
Debt Instrument [Line Items]
Redemption Price	100.00%
Senior Notes | 6.25% notes due 2025 | 2022
Debt Instrument [Line Items]
Redemption Price	103.125%	103.125%
Senior Notes | 6.25% notes due 2025 | 2023
Debt Instrument [Line Items]
Redemption Price		101.563%
Senior Notes | 6.25% notes due 2025 | 2024 and thereafter
Debt Instrument [Line Items]
Redemption Price		100.00%
Senior Notes | 6.25% notes due 2025 | Change in Control Redemption
Debt Instrument [Line Items]
Redemption Price		101.00%
Revolving Credit Facility
Debt Instrument [Line Items]
Amount outstanding		$ 0	$ 0
Revolving Credit Facility | Amended Revolving Credit Facility
Debt Instrument [Line Items]
Repayment amount	$ 295,000,000
Amount outstanding	$ 304,000,000

LONG-TERM DEBT - Revolving Cred

LONG-TERM DEBT - Revolving Credit Facility (Details)	Nov. 09, 2020USD ($)	Sep. 30, 2020USD ($)	Nov. 30, 2023USD ($)	Jun. 08, 2020USD ($)	Sep. 30, 2019USD ($)	Jun. 07, 2019USD ($)
6.25% notes due 2024
Debt Instrument [Line Items]
Interest rate (percent)				6.25%
6.25% notes due 2024 | Forecast
Debt Instrument [Line Items]
Amount outstanding			$ 75,000,000
Revolving Credit Facility
Debt Instrument [Line Items]
Amount outstanding		$ 0			$ 0
Amount outstanding, letters of credit		$ 0			0
Revolving Credit Facility | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate		2.00%
Unused capacity, commitment fee percentage		0.30%
Revolving Credit Facility | Triggering Event One
Debt Instrument [Line Items]
Debt-to-EBITDA ratio		2.25
Revolving Credit Facility | Amended Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 625,000,000
Amount outstanding				$ 304,000,000
Maximum limit on issuance of letters of credit		$ 100,000,000			$ 100,000,000
Revolving Credit Facility | Amended Revolving Credit Facility | Subsequent Event
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 685,000,000
Revolving credit facility increased	$ 60,000,000
Revolving Credit Facility | Overnight Revolving Credit Loans | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Line of Credit | Amended Revolving Credit Facility | Term Loan Facility
Debt Instrument [Line Items]
Debt instrument, face amount						$ 175,000,000

LONG-TERM DEBT - 3.25 Percent C

LONG-TERM DEBT - 3.25 Percent Convertible Notes (Details) - 3.25% convertible notes due 2037 - Convertible Notes	Sep. 22, 2017trading_dayd$ / shares$ / noteshares
Debt Instrument [Line Items]
Interest rate (percent)	3.25%
Shares issuable upon conversion (in shares) | shares	25.0474
Initial principal amount per note (in dollars per note) | $ / note	1,000
Conversion price (in dollars per share) | $ / shares	$ 39.92
Maximum number of common stock convertible notes are convertible into (in shares) | shares	8,000,000
2022
Debt Instrument [Line Items]
Redemption Price	100.00%
Conversion Condition One
Debt Instrument [Line Items]
Threshold trading days	20
Threshold consecutive trading days	30
Threshold percentage of stock price trigger	130.00%
Conversion Condition Two
Debt Instrument [Line Items]
Threshold consecutive trading days	5
Threshold percentage of stock price trigger	98.00%
Threshold number of business days | d	5

LONG-TERM DEBT - 6.25 Percent_2

LONG-TERM DEBT - 6.25 Percent Notes due 2024 (Details)	12 Months Ended
	Sep. 30, 2020	Jun. 08, 2020	Jun. 11, 2015
6.25% notes due 2024
Debt Instrument [Line Items]
Interest rate (percent)		6.25%
6.25% notes due 2024 | Notes
Debt Instrument [Line Items]
Interest rate (percent)		625.00%
6.25% notes due 2024 | Senior Notes
Debt Instrument [Line Items]
Redemption Price	100.00%
6.25% notes due 2024 | Senior Notes | 2019
Debt Instrument [Line Items]
Redemption Price	103.125%
6.25% notes due 2024 | Senior Notes | 2020
Debt Instrument [Line Items]
Redemption Price	102.083%
6.25% notes due 2024 | Senior Notes | 2021
Debt Instrument [Line Items]
Redemption Price	101.042%
6.25% notes due 2024 | Senior Notes | 2022 and thereafter
Debt Instrument [Line Items]
Redemption Price	100.00%
6.25% notes due 2024 | Senior Notes | Change in control
Debt Instrument [Line Items]
Redemption Price	101.00%
7.875% convertible notes due 2026 | Convertible Notes
Debt Instrument [Line Items]
Interest rate (percent)			7.875%
Redemption Price	100.00%

LONG-TERM DEBT - 7.875 Percent

LONG-TERM DEBT - 7.875 Percent Convertible Notes (Details) - Convertible Notes - 7.875% convertible notes	1 Months Ended	12 Months Ended
	Dec. 31, 2012USD ($)$ / sharesshares	Sep. 30, 2020USD ($)trading_dayd$ / noteshares	Sep. 30, 2019USD ($)trading_day	Jun. 11, 2015
Debt Instrument [Line Items]
Interest rate (percent)				7.875%
Face principal amount per note | $	$ 1,000
Equivalent shares of common stock per 1000 principal amount of convertible notes (in shares) | shares	83.3333
Conversion price (in dollars per share) | $ / shares	$ 12
Threshold trading days			20
Threshold consecutive trading days			30
Threshold percentage of stock price trigger			120.00%
Redemption price		100.00%
Maximum number of common stock convertible notes are convertible into (in shares) | shares		2,000,000
Principal amount | $		$ 23,000,000	$ 23,000,000
Triggering Event One
Debt Instrument [Line Items]
Threshold trading days		20
Threshold consecutive trading days		30
Threshold percentage of stock price trigger		120.00%
Triggering Event Two
Debt Instrument [Line Items]
Initial principal amount per note (in dollars per note) | $ / note		1,000
Threshold trading days | d		5
Threshold consecutive trading days		5
Threshold percentage of stock price trigger		97.00%

LONG-TERM DEBT - Summaries of C

LONG-TERM DEBT - Summaries of Convertible Notes (Details) - Convertible Notes - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Principal amount of convertible notes	$ 348	$ 348
Unamortized discount on convertible notes and issuance costs	(34)	(40)
Net carrying value	314	308
Contractual interest coupon	17	17	$ 17
Amortization of debt discount	2	2	2
Total	$ 19	$ 19	$ 19
7.875%
Debt Instrument [Line Items]
Total amortization period for debt discount (in years)	8 years
Remaining amortization period for debt discount (in years)	0 years
Effective interest rates on convertible notes	10.90%
3.25%
Debt Instrument [Line Items]
Total amortization period for debt discount (in years)	8 years
Remaining amortization period for debt discount (in years)	5 years
Effective interest rates on convertible notes	5.60%

LONG-TERM DEBT - Debt Maturitie

LONG-TERM DEBT - Debt Maturities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 22, 2017	Jun. 11, 2015	Feb. 13, 2014
Convertible Notes
Long-term debt by fiscal year maturity [Abstract]
Unamortized issuance costs, fair value of equity component	$ 29
Unamortized issuance costs	14
Convertible Notes | Debt maturities at Principal Amount
Long-term debt by fiscal year maturity [Abstract]
Total	1,265
2021	36
2022	18
2023	13
2024	573
2025	300
Thereafter	325
Convertible Notes | 3.25% convertible notes
Long-term debt by fiscal year maturity [Abstract]
Unamortized issuance costs	5	$ 6
Interest rate (percent)			3.25%
Convertible Notes | 7.875% convertible notes
Long-term debt by fiscal year maturity [Abstract]
Interest rate (percent)				7.875%
Notes | 6.25% notes
Long-term debt by fiscal year maturity [Abstract]
Unamortized issuance costs	$ 5
Interest rate (percent)					6.25%

LONG-TERM DEBT - Letter of Cred

LONG-TERM DEBT - Letter of Credit Facilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Feb. 21, 2014
Standby Letters of Credit
Debt Instrument [Line Items]
Maximum limit on issuance of letters of credit				$ 25
Amount outstanding, letters of credit			$ 1
Other Letters of Credit Arrangements
Debt Instrument [Line Items]
Amount outstanding, letters of credit	$ 11	$ 12

LONG-TERM DEBT - Other (Details

LONG-TERM DEBT - Other (Details) - China - Notes Payable to Banks - Other Export Financing Arrangements - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Debt default, amount	$ 35
Long-term debt	$ 16	$ 30

FINANCIAL INSTRUMENTS - Additio

FINANCIAL INSTRUMENTS - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2018
Foreign Exchange Forward
Derivative [Line Items]
Term of derivative contract			18 years
Foreign Currency Option Contracts
Derivative [Line Items]
Aggregate notional amount			$ 39,000,000	$ 139,000,000
Foreign Currency Option Contracts, Translation Risk
Derivative [Line Items]
Aggregate notional amount			24,000,000	28,000,000
Cross-currency Swap
Derivative [Line Items]
Aggregate notional amount		$ 225,000,000		225,000,000		$ 225,000,000
Proceeds derivative instruments		19,000,000
Accrued interest receivable, net		$ 2,000,000
Cash Flow Hedging | Designated as Hedging Instrument
Derivative [Line Items]
Aggregate notional amount			65,000,000	110,000,000	$ 154,000,000
Cash Flow Hedging | Foreign Exchange Forward | Designated as Hedging Instrument
Derivative [Line Items]
Aggregate notional amount			$ 65,000,000	$ 110,000,000
Net Investment Hedging | Cross-currency Swap | Designated as Hedging Instrument
Derivative [Line Items]
Proceeds from settlement of swap contracts	$ 11,000,000
Component of proceeds that was previously in net accrued interest receivable	$ 1,000,000

FINANCIAL INSTRUMENTS - The Imp

FINANCIAL INSTRUMENTS - The Impact of Derivatives on Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain recognized in AOCI	$ 4	$ 19	$ 3
Designated as Hedging Instrument | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) reclassified from AOCI into income	(1)	4	(1)
Not Designated as Hedging Instrument | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income	0	0	(2)
Not Designated as Hedging Instrument | Other Income (expense)
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized in income	$ 1	$ 1	$ 2

FINANCIAL INSTRUMENTS - Fair Va

FINANCIAL INSTRUMENTS - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Carrying Value
Fair Value
Cash and cash equivalents	$ 315	$ 108
Short-term debt	39	41
Long-term debt	1,188	902
Carrying Value | Foreign currency option contracts
Fair Value
Foreign currency option contracts and exchange forward contracts	1	0
Carrying Value | Foreign Exchange Forward
Fair Value
Cross-currency swaps (other liabilities)	1	0
Carrying Value | Cross-currency swap
Fair Value
Foreign currency option contracts and exchange forward contracts	0	10
Cross-currency swaps (other liabilities)	0	5
Fair Value
Fair Value
Cash and cash equivalents	315	108
Short-term debt	58	60
Long-term debt	1,259	953
Fair Value | Foreign currency option contracts
Fair Value
Foreign currency option contracts and exchange forward contracts	1	0
Fair Value | Foreign Exchange Forward
Fair Value
Cross-currency swaps (other liabilities)	1	0
Fair Value | Cross-currency swap
Fair Value
Foreign currency option contracts and exchange forward contracts	0	10
Cross-currency swaps (other liabilities)	$ 0	$ 5

FINANCIAL INSTRUMENTS - Offsett

FINANCIAL INSTRUMENTS - Offsetting of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Foreign currency option contracts
Offsetting Derivative Asset
Gross Amounts Recognized	$ 1	$ 0
Gross Amounts Offset	0	0
Net Amounts Reported	1	0
Cross-currency swap
Offsetting Derivative Asset
Gross Amounts Recognized	0	10
Gross Amounts Offset	0	0
Net Amounts Reported	0	10
Offsetting Derivative Liabilities
Gross Amounts Recognized	0	5
Gross Amounts Offset	0	0
Net Amounts Reported	0	5
Foreign Exchange Forward
Offsetting Derivative Liabilities
Gross Amounts Recognized	1	0
Gross Amounts Offset	0	0
Net Amounts Reported	$ 1	$ 0

FINANCIAL INSTRUMENTS - Fair _2

FINANCIAL INSTRUMENTS - Fair Value of Financial Instruments by the Valuation Hierarchy (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Level 1
Derivatives, Fair Value [Line Items]
Cash and cash equivalents	$ 315	$ 108
Short-term debt	0	0
Long-term debt	0	0
Level 2
Derivatives, Fair Value [Line Items]
Cash and cash equivalents	0	0
Short-term debt	43	49
Long-term debt	1,103	782
Level 3
Derivatives, Fair Value [Line Items]
Cash and cash equivalents	0	0
Short-term debt	15	11
Long-term debt	156	171
Foreign currency option contracts | Level 1
Derivatives, Fair Value [Line Items]
Foreign exchange forward contracts and cross-currency swaps (other assets)	0	0
Foreign currency option contracts | Level 2
Derivatives, Fair Value [Line Items]
Foreign exchange forward contracts and cross-currency swaps (other assets)	1	0
Foreign currency option contracts | Level 3
Derivatives, Fair Value [Line Items]
Foreign exchange forward contracts and cross-currency swaps (other assets)	0	0
Foreign Exchange Forward | Level 1
Derivatives, Fair Value [Line Items]
Foreign exchange forward contracts and cross-currency swaps (other assets)	0	0
Foreign exchange forward contracts cross-currency swaps (other liabilities)	0	0
Foreign Exchange Forward | Level 2
Derivatives, Fair Value [Line Items]
Foreign exchange forward contracts and cross-currency swaps (other assets)	0	0
Foreign exchange forward contracts cross-currency swaps (other liabilities)	1	0
Foreign Exchange Forward | Level 3
Derivatives, Fair Value [Line Items]
Foreign exchange forward contracts and cross-currency swaps (other assets)	0	0
Foreign exchange forward contracts cross-currency swaps (other liabilities)	0	0
Cross-currency swap | Level 1
Derivatives, Fair Value [Line Items]
Foreign exchange forward contracts and cross-currency swaps (other assets)	0	0
Foreign exchange forward contracts cross-currency swaps (other liabilities)	0	0
Cross-currency swap | Level 2
Derivatives, Fair Value [Line Items]
Foreign exchange forward contracts and cross-currency swaps (other assets)	0	10
Foreign exchange forward contracts cross-currency swaps (other liabilities)	0	5
Cross-currency swap | Level 3
Derivatives, Fair Value [Line Items]
Foreign exchange forward contracts and cross-currency swaps (other assets)	0	0
Foreign exchange forward contracts cross-currency swaps (other liabilities)	$ 0	$ 0

FINANCIAL INSTRUMENTS - Changes

FINANCIAL INSTRUMENTS - Changes in Fair Value of Level 3 Financial Assets and Liabilities (Details) - Level 3 - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, beginning balance	$ 0	$ 0
Purchases, issuances, sales and settlements:
Purchases	2	0
Settlements	(2)	(1)
Transfer in and / or out of Level 3	0	0
Reclass between short-term and long-term	0	0
Fair Value, ending balance	1	0
Foreign Currency Option Contracts | Short-term foreign currency option contracts (asset)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, beginning balance	0	0
Purchases, issuances, sales and settlements:
Purchases	2	0
Settlements	(2)	(1)
Transfer in and / or out of Level 3	0	0
Reclass between short-term and long-term	0	0
Fair Value, ending balance	1	0
Foreign Currency Option Contracts | Long-term foreign currency option contracts (asset)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Fair Value, beginning balance	0	0
Purchases, issuances, sales and settlements:
Purchases	0	0
Settlements	0	0
Transfer in and / or out of Level 3	0	0
Reclass between short-term and long-term	0	0
Fair Value, ending balance	0	0
Other Income
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains	0	(1)
Total realized gains	1	1
Other Income | Foreign Currency Option Contracts | Short-term foreign currency option contracts (asset)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains	0	(1)
Total realized gains	1	1
Other Income | Foreign Currency Option Contracts | Long-term foreign currency option contracts (asset)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains	0	0
Total realized gains	0	0
Cost of Sales
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains	0	1
Total realized gains	0	0
Cost of Sales | Foreign Currency Option Contracts | Short-term foreign currency option contracts (asset)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains	0	1
Total realized gains	0	0
Cost of Sales | Foreign Currency Option Contracts | Long-term foreign currency option contracts (asset)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Total unrealized gains	0	0
Total realized gains	$ 0	$ 0

SHAREHOLDERS' EQUITY - Addition

SHAREHOLDERS' EQUITY - Additional Information (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Nov. 07, 2019	Jul. 26, 2019	Nov. 02, 2018	Sep. 30, 2017	Jul. 21, 2016
Class of Stock [Line Items]
Dividends declared or paid	$ 0	$ 0	$ 0
Common stock authorized (in shares)	500,000,000
Common stock par value (in dollars per share)	$ 1
Preferred stock authorized (in shares)	30,000,000
Common stock reserved for issuance under long-term incentive plan (in shares)	4,000,000
Common stock available for future grants under long-term incentive plan (in shares)	4,100,000
Remaining authorized debt repurchase amount	$ 76,000,000
Treasury stock acquired during period (in shares)			4,500,000
Repurchase of common stock	$ 241,000,000	$ 96,000,000	$ 100,000,000
Debt Securities
Class of Stock [Line Items]
Remaining authorized stock repurchase amount			$ 50,000,000
Repurchased principal amount of debt							$ 100,000,000
Repurchase Program, July 2019 | Common Stock
Class of Stock [Line Items]
Stock repurchase, authorized amount					$ 250,000,000
Common stock repurchased (in shares)	10,400,000
Value of common stock repurchased	$ 241,000,000
Remaining authorized stock repurchase amount	$ 59,000,000
Repurchase Program, November 2019 | Common Stock
Class of Stock [Line Items]
Stock repurchase, authorized amount				$ 325,000,000
Repurchase Progam, November 2018 | Debt Securities
Class of Stock [Line Items]
Repurchase program, authorized amount						$ 100,000,000
Repurchase Progam, November 2018 | Common Stock
Class of Stock [Line Items]
Stock repurchase, authorized amount						$ 200,000,000
Common stock repurchased (in shares)		4,000,000
Value of common stock repurchased		$ 71,000,000
Repurchase Program, July 2016 | Debt Securities
Class of Stock [Line Items]
Repurchase program, authorized amount								$ 150,000,000
Repurchase Program, July 2016 | Common Stock
Class of Stock [Line Items]
Stock repurchase, authorized amount								$ 100,000,000
Series A Junior Preferred Stock
Class of Stock [Line Items]
Preferred stock authorized (in shares)	2,000,000
Preferred stock issued (in shares)	0

SHAREHOLDERS' EQUITY - Componen

SHAREHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance	$ 415	$ 317	$ 295
Other comprehensive income (loss) before reclassification	56	(115)	(38)
Amounts reclassified from accumulated other comprehensive income (loss)	11	0	17
Net current-period other comprehensive income (loss)	67	(115)	(21)
Ending balance	495	415	317
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance	(681)	(566)	(545)
Ending balance	(614)	(681)	(566)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance	(107)	(90)	(41)
Other comprehensive income (loss) before reclassification	(22)	(17)	(49)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Net current-period other comprehensive income (loss)	(22)	(17)	(49)
Ending balance	(129)	(107)	(90)
Employee Benefit Related Adjustments
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance	(572)	(476)	(500)
Other comprehensive income (loss) before reclassification	79	(100)	8
Amounts reclassified from accumulated other comprehensive income (loss)	10	4	16
Net current-period other comprehensive income (loss)	89	(96)	24
Ending balance	(483)	(572)	(476)
Unrealized Income (Loss) on cash flow hedges
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Beginning balance	(2)	0	(4)
Other comprehensive income (loss) before reclassification	(1)	2	3
Amounts reclassified from accumulated other comprehensive income (loss)	1	(4)	1
Net current-period other comprehensive income (loss)	0	(2)	4
Ending balance	$ (2)	$ (2)	$ 0

SHAREHOLDERS' EQUITY - Changes

SHAREHOLDERS' EQUITY - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income (expense), net									$ 46	$ 40	$ 26
INCOME (LOSS) BEFORE INCOME TAXES									326	377	278
Tax (benefit) expense	$ 5	$ (13)	$ 73	$ 13	$ 13	$ 21	$ 27	$ 21	78	82	149
Net income	$ 0	$ (34)	$ 242	$ 41	$ 41	$ 89	$ 74	$ 92	249	296	126
Amount Reclassified from Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Net income									10	4	16
Amount Reclassified from Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income (expense), net									(36)	(35)	(35)
Amount Reclassified from Accumulated Other Comprehensive Income | Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other income (expense), net									47	39	46
Amount Reclassified from Accumulated Other Comprehensive Income | Employee Benefit Related Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Recognized prior service costs due to settlement											6
INCOME (LOSS) BEFORE INCOME TAXES									11	4	17
Tax (benefit) expense									$ (1)	$ 0	$ (1)

EQUITY BASED COMPENSATION - Add

EQUITY BASED COMPENSATION - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting term	3 years
Shares granted in period (in shares)	600	500	400
Weighted average grant-date fair value non-vested restricted shares and share units granted during period (in dollars per share)	$ 23.77	$ 17.24	$ 24.93
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value non-vested restricted shares and share units granted during period (in dollars per share)	$ 23.77
Total unrecognized compensation costs related to non-vested equity compensation arrangements	$ 9
Weighted average period for compensation cost recognition	1 year 10 months 2 days
Compensation costs (income) recognized	$ 8	$ 8	$ 8
Granted (in shares)	558
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value non-vested restricted shares and share units granted during period (in dollars per share)	$ 19.42
Total unrecognized compensation costs related to non-vested equity compensation arrangements	$ 9
Weighted average period for compensation cost recognition	1 year 10 months 9 days
Compensation costs (income) recognized	$ (1)	$ 10	$ 14
Granted (in shares)	732
Performance Shares | Fiscal Year 2017 To 2019 LTIP Cycle
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		300	300	300

EQUITY BASED COMPENSATION - Rol

EQUITY BASED COMPENSATION - Rollforward of Restricted Stock, Restricted Share, and Performance Share Units and Activity (Details) shares in Thousands	12 Months Ended
	Sep. 30, 2020$ / sharesshares
Restricted Stock and Restricted Stock Units
Number of Shares
Beginning balance (in shares) | shares	1,320
Granted (in shares) | shares	558
Vested (in shares) | shares	(533)
Forfeited (in shares) | shares	(170)
Ending balance (in shares) | shares	1,175
Weighted-Average Grant-Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 17.55
Granted (in dollars per share) | $ / shares	23.77
Vested (in dollars per share) | $ / shares	13.57
Forfeited (in dollars per share) | $ / shares	21.41
Ending balance (in dollars per share) | $ / shares	$ 21.75
Performance Shares
Number of Shares
Beginning balance (in shares) | shares	1,325
Granted (in shares) | shares	732
Vested (in shares) | shares	(851)
Forfeited (in shares) | shares	(170)
Ending balance (in shares) | shares	1,036
Weighted-Average Grant-Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 17.08
Granted (in dollars per share) | $ / shares	19.42
Vested (in dollars per share) | $ / shares	12.92
Forfeited (in dollars per share) | $ / shares	20.90
Ending balance (in dollars per share) | $ / shares	$ 21.52

RETIREMENT MEDICAL PLANS - Addi

RETIREMENT MEDICAL PLANS - Additional Information (Details) - USD ($)	Sep. 17, 2020	Sep. 23, 2019	Sep. 08, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2017	Sep. 30, 2020	Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Health care cost trend rate (weighted average)				6.07%			6.07%
Net actuarial loss estimated to be amortized from accumulated other comprehensive loss				$ (13,000,000)			$ (13,000,000)
The prior service benefit estimated to be amortized from accumulated other comprehensive loss to periodic benefits cost				35,000,000			$ 35,000,000
Postemployment Retirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Annual decrease in contribution	$ 500	$ 600
Prior service credit to be amortized				$ 7,000,000	$ 15,000,000	$ 315,000,000
Average period of amortization, inactive plan participants				9 years	9 years		9 years
Annual defined contribution per retiree		$ 3,000	$ 4,000
Average remaining service period of active participants			7 years
U.S. Retiree Medical Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Average period of amortization, inactive plan participants							11 years
Health care cost trend rate (weighted average)				6.07%	6.36%		6.07%	6.18%

RETIREMENT MEDICAL PLANS - Reti

RETIREMENT MEDICAL PLANS - Retiree Medical Liability Expense Assumptions (Details)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Assumptions Used In Measurement of Retiree Medical Liability and Expense
Health care cost trend rate (weighted average)	6.07%
U.S. Retiree Medical Plan
Assumptions Used In Measurement of Retiree Medical Liability and Expense
Discount rate	2.56%	2.98%	4.05%
Health care cost trend rate (weighted average)	6.07%	6.36%	6.18%
Ultimate health care trend rate	4.67%	4.69%	4.63%
Year ultimate rate is reached	2028	2028	2024

RETIREMENT MEDICAL PLANS - Re_2

RETIREMENT MEDICAL PLANS - Retiree Medical Liability Components As of Balance Sheet Date (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	$ 1,629	$ 1,627
U.S. Retiree Medical Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	52	67	$ 86
U.S. Retiree Medical Plan | Retirees
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	52	67
U.S. Retiree Medical Plan | Employees eligible to retire
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit obligation	$ 0	$ 0

RETIREMENT MEDICAL PLANS - Roll

RETIREMENT MEDICAL PLANS - Rollforward Of Retiree Medical Liability (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
PBO — beginning of year	$ 1,627
Actuarial loss (gain)	31
PBO — end of year	1,629	$ 1,627
U.S. Retiree Medical Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
PBO — beginning of year	67	86
Interest cost	2	3	$ 3
Actuarial loss (gain)	0	4
Plan amendment	(7)	(15)
Benefit payments	(10)	(11)
PBO — end of year	52	67	$ 86
Retiree medical liability	$ 52	$ 67

RETIREMENT MEDICAL PLANS - Re_3

RETIREMENT MEDICAL PLANS - Retiree Medical Liability Current and Long Term Components (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Retiree Medical Liability Current And Long Term Components
Long-term — included in retirement benefits	$ 196	$ 336
U.S. Retiree Medical Plan
Retiree Medical Liability Current And Long Term Components
Current — included in compensation and benefits	6	11
Long-term — included in retirement benefits	46	56
Retiree medical liability	$ 52	$ 67

RETIREMENT MEDICAL PLANS - Amou

RETIREMENT MEDICAL PLANS - Amount Of Retiree Medical Obligations Recorded In Accumulated Other Comprehensive Loss Net Of Tax (Details) - U.S. Retiree Medical Plan - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Balance, beginning	$ (95)	$ (102)
Net actuarial (gain) loss for the year	0	4
Recognized prior service costs due to plan amendment	(7)	(15)
Amortization for the year	22	20
Deferred tax impact	5	(2)
Balance, ending	(75)	(95)
Net Actuarial Loss
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Balance, beginning	70	76
Net actuarial (gain) loss for the year	0	4
Recognized prior service costs due to plan amendment	0	0
Amortization for the year	(14)	(15)
Deferred tax impact	8	5
Balance, ending	64	70
Prior Service Cost (Benefit)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Balance, beginning	(165)	(178)
Net actuarial (gain) loss for the year	0	0
Recognized prior service costs due to plan amendment	(7)	(15)
Amortization for the year	36	35
Deferred tax impact	(3)	(7)
Balance, ending	$ (139)	$ (165)

RETIREMENT MEDICAL PLANS - Comp

RETIREMENT MEDICAL PLANS - Components Of Retiree Medical Expense (Details) - U.S. Retiree Medical Plan - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	2	3	3
Amortization of - Prior service cost (benefit)	(36)	(35)	(35)
Actuarial losses	14	15	17
Net periodic income	$ (20)	$ (17)	$ (15)

RETIREMENT MEDICAL PLANS - Re_4

RETIREMENT MEDICAL PLANS - Retiree Medical Plan Effect Of One Percentage Point Change In Assumed Health Care Cost Trend Rates (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Retiree Medical Plan Effect Of One Percentage Point Change In Assumed Health Care Cost Trend Rates [Abstract]
Effect on total service and interest cost 1% increase	$ 0	$ 0
Effect on total service and interest cost 1% decrease	0	0
Effect on APBO 1% increase	6	5
Effect on APBO 1% decrease	$ (5)	$ (4)

RETIREMENT MEDICAL PLANS - Re_5

RETIREMENT MEDICAL PLANS - Retiree Medical Plan Estimated Future Benefit Payments (Details) - U.S. Retiree Medical Plan $ in Millions	Sep. 30, 2020USD ($)
Gross Benefit Payments
Fiscal 2021	$ 6
Fiscal 2022	5
Fiscal 2023	5
Fiscal 2024	4
Fiscal 2025	4
Fiscal 2026 – 2029	13
Gross Receipts
Fiscal 2021	0
Fiscal 2022	0
Fiscal 2023	0
Fiscal 2024	0
Fiscal 2025	0
Fiscal 2026 – 2029	$ 2

RETIREMENT PENSION PLANS - Addi

RETIREMENT PENSION PLANS - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Settlements	$ 0	$ 0	$ 6
Net actuarial loss (gain) for the year	31
Defined contribution savings plan expense	14	21	21
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Settlements	0	0	6
Net actuarial loss (gain) for the year	$ 40	233
Pension Plan | U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Average period of amortization, inactive plan participants	16 years
Net actuarial loss (gain) for the year	$ 64	122
Unfunded investment commitments	$ 1
Pension Plan | U.S. Plans | Minimum | Equity Investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	20.00%
Pension Plan | U.S. Plans | Minimum | Fixed Income Investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	30.00%
Pension Plan | U.S. Plans | Minimum | Alternative investments measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	10.00%
Pension Plan | U.S. Plans | Maximum | Equity Investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	50.00%
Pension Plan | U.S. Plans | Maximum | Fixed Income Investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	60.00%
Pension Plan | U.S. Plans | Maximum | Alternative investments measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	25.00%
Pension Plan | Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Average period of amortization, inactive plan participants	25 years
Settlements			$ 6
Net actuarial loss (gain) for the year	$ (24)	$ 111
Pension Plan | Non-U.S. Plans | Minimum | Fixed Income Investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	30.00%
Pension Plan | Non-U.S. Plans | Minimum | Alternative investments measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	15.00%
Pension Plan | Non-U.S. Plans | Minimum | Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	20.00%
Pension Plan | Non-U.S. Plans | Minimum | Real estate measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	0.00%
Pension Plan | Non-U.S. Plans | Maximum | Fixed Income Investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	40.00%
Pension Plan | Non-U.S. Plans | Maximum | Alternative investments measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	35.00%
Pension Plan | Non-U.S. Plans | Maximum | Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	35.00%
Pension Plan | Non-U.S. Plans | Maximum | Real estate measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target asset allocation	15.00%

RETIREMENT PENSION PLANS - Sche

RETIREMENT PENSION PLANS - Schedule of US and Non-US Pension Benefit Obligation Expense and Net Expense Assumptions (Details) - Pension Plan	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate			4.30%
Assumed return on plan assets (beginning of the year)	7.75%	7.75%	7.75%
U.S. Plans | Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	2.50%	3.10%
U.S. Plans | Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	2.60%	3.15%
U.K. Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rate	1.70%	1.80%	2.90%
Assumed return on plan assets (beginning of the year)	5.75%	6.00%	6.00%

RETIREMENT PENSION PLANS - Roll

RETIREMENT PENSION PLANS - Rollforward of Pension Liability and Pension Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Change in PBO
PBO — beginning of year	$ 1,627
Actuarial loss (gain)	31
PBO — end of year	1,629	$ 1,627
Change in plan assets
Fair value of assets — beginning of year	1,505
Fair value of assets — end of year	1,669	1,505
Pension Plan
Change in PBO
PBO — beginning of year	1,627	1,476
Interest cost	42	53	$ 54
Actuarial loss (gain)	40	233
Prior service cost	0	8
Acquisitions	0	1
Settlements	0	(3)
Benefit payments	(99)	(105)
Foreign currency rate changes	19	(36)
PBO — end of year	1,629	1,627	1,476
Change in plan assets
Fair value of assets — beginning of year	1,505	1,446
Actual return on plan assets	233	206
Employer contributions	5	5
Settlements	0	(3)
Benefit payments	(99)	(105)
Foreign currency rate changes	25	(44)
Fair value of assets — end of year	1,669	1,505	1,446
Funded status - over (under)	40	(122)
U.S. | Pension Plan
Change in PBO
PBO — beginning of year	1,006	922
Interest cost	31	37
Actuarial loss (gain)	64	122
Prior service cost	0	0
Acquisitions	0	0
Settlements	0	0
Benefit payments	(74)	(75)
Foreign currency rate changes	0	0
PBO — end of year	1,027	1,006	922
Change in plan assets
Fair value of assets — beginning of year	741	744
Actual return on plan assets	221	67
Employer contributions	5	5
Settlements	0	0
Benefit payments	(74)	(75)
Foreign currency rate changes	0	0
Fair value of assets — end of year	893	741	744
Funded status - over (under)	(134)	(265)
Non- U.S. | Pension Plan
Change in PBO
PBO — beginning of year	621	554
Interest cost	11	16
Actuarial loss (gain)	(24)	111
Prior service cost	0	8
Acquisitions	0	1
Settlements	0	(3)
Benefit payments	(25)	(30)
Foreign currency rate changes	19	(36)
PBO — end of year	602	621	554
Change in plan assets
Fair value of assets — beginning of year	764	702
Actual return on plan assets	12	139
Employer contributions	0	0
Settlements	0	(3)
Benefit payments	(25)	(30)
Foreign currency rate changes	25	(44)
Fair value of assets — end of year	776	764	$ 702
Funded status - over (under)	$ 174	$ 143

RETIREMENT PENSION PLANS - Sc_2

RETIREMENT PENSION PLANS - Schedule of Balance Sheet Classification of Net Pension Liability (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Retirement benefits-non-current	$ (196)	$ (336)
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Non-current assets	179	149
Current liabilities	(5)	(5)
Retirement benefits-non-current	(134)	(266)
Net amount recognized	40	(122)
U.S. | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Non-current assets	0	0
Current liabilities	(5)	(5)
Retirement benefits-non-current	(129)	(260)
Net amount recognized	(134)	(265)
Non- U.S. | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Non-current assets	179	149
Current liabilities	0	0
Retirement benefits-non-current	(5)	(6)
Net amount recognized	$ 174	$ 143

RETIREMENT PENSION PLANS - Sc_3

RETIREMENT PENSION PLANS - Schedule of Pension Costs Recognized in Other Comprehensive Loss (Details) - Pension Plan - Net Actuarial Loss - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Balance, beginning	$ 667	$ 578
Net actuarial loss for the year	(98)	133
Amortization for the year	(33)	(24)
Deferred tax impact	22	(20)
Balance, ending	558	667
U.S.
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Balance, beginning	467	394
Net actuarial loss for the year	(101)	113
Amortization for the year	(26)	(20)
Deferred tax impact	22	(20)
Balance, ending	362	467
Non- U.S.
Accumulated Other Comprehensive Income (Loss), Net Of Tax [Roll Forward]
Balance, beginning	200	184
Net actuarial loss for the year	3	20
Amortization for the year	(7)	(4)
Deferred tax impact	0	0
Balance, ending	$ 196	$ 200

RETIREMENT PENSION PLANS - Pens

RETIREMENT PENSION PLANS - Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
Pension liability	$ 134	$ 266
Retiree medical liability — long term (see Note 19)	46	56
Other	16	14
Total retirement benefits	$ 196	$ 336

RETIREMENT PENSION PLANS - Sc_4

RETIREMENT PENSION PLANS - Schedule of Projected Benefit Obligation Accumulated Benefit Obligation and Plan Assets (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
ABO Exceeds Assets, PBO	$ 1,032	$ 1,012
ABO Exceeds Assets, ABO	1,032	1,012
ABO Exceeds Assets, Plan Assets	893	741
Assets Exceed ABO, PBO	597	615
Assets Exceed ABO, ABO	597	615
Assets Exceed ABO, Plan Assets	776	764
PBO	1,629	1,627
ABO	1,629	1,627
Total assets at fair value	$ 1,669	$ 1,505

RETIREMENT PENSION PLANS - Sc_5

RETIREMENT PENSION PLANS - Schedule of Net Periodic Pension Benefit Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Settlement loss	$ 0	$ 0	$ 6
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	0	0	0
Interest cost	42	53	54
Assumed rate of return on plan assets	(97)	(97)	(99)
Amortization of actuarial losses	33	24	29
Settlement loss	0	0	6
Net periodic income	$ (22)	$ (20)	$ (10)

RETIREMENT PENSION PLANS - Pe_2

RETIREMENT PENSION PLANS - Pension Plan Investments Measured at Fair Value by Level Within Fair Value Hierarchy (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	$ 1,669	$ 1,505
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	1,669	1,505	$ 1,446
Pension Plan | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	5	105	100
Pension Plan | Level 3 | Private equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	0	19	17
Pension Plan | Level 3 | Alternatives – Partnerships
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	5	86	83
Pension Plan | U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	893	741	744
Pension Plan | U.S. Plans | U.S. – Large cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	209	38
Pension Plan | U.S. Plans | U.S. – Small cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	15	15
Pension Plan | U.S. Plans | Private equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value		19
Pension Plan | U.S. Plans | International equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	12	21
Pension Plan | U.S. Plans | Total equity investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	425	247
Pension Plan | U.S. Plans | U.S. fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	279	236
Pension Plan | U.S. Plans | Emerging fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	13	16
Pension Plan | U.S. Plans | Partnerships fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	12
Pension Plan | U.S. Plans | Total fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	318	291
Pension Plan | U.S. Plans | Alternatives
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	9
Pension Plan | U.S. Plans | Alternatives – Partnerships
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	5	86
Pension Plan | U.S. Plans | Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	62	39
Pension Plan | U.S. Plans | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	254	89
Pension Plan | U.S. Plans | Level 1 | U.S. – Large cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	209	38
Pension Plan | U.S. Plans | Level 1 | U.S. – Small cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	15	15
Pension Plan | U.S. Plans | Level 1 | Private equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value		0
Pension Plan | U.S. Plans | Level 1 | International equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	12	21
Pension Plan | U.S. Plans | Level 1 | Total equity investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	236	74
Pension Plan | U.S. Plans | Level 1 | U.S. fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	9	3
Pension Plan | U.S. Plans | Level 1 | Emerging fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 1 | Partnerships fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	12
Pension Plan | U.S. Plans | Level 1 | Total fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	9	15
Pension Plan | U.S. Plans | Level 1 | Alternatives
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	9
Pension Plan | U.S. Plans | Level 1 | Alternatives – Partnerships
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 1 | Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	345	288
Pension Plan | U.S. Plans | Level 2 | U.S. – Large cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | U.S. – Small cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | Private equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value		0
Pension Plan | U.S. Plans | Level 2 | International equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | Total equity investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | U.S. fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	270	233
Pension Plan | U.S. Plans | Level 2 | Emerging fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	13	16
Pension Plan | U.S. Plans | Level 2 | Partnerships fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | Total fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	283	249
Pension Plan | U.S. Plans | Level 2 | Alternatives
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0
Pension Plan | U.S. Plans | Level 2 | Alternatives – Partnerships
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 2 | Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	62	39
Pension Plan | U.S. Plans | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	5	105
Pension Plan | U.S. Plans | Level 3 | U.S. – Large cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 3 | U.S. – Small cap
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 3 | Private equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value		19
Pension Plan | U.S. Plans | Level 3 | International equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 3 | Total equity investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	19
Pension Plan | U.S. Plans | Level 3 | U.S. fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 3 | Emerging fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 3 | Partnerships fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 3 | Total fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Level 3 | Alternatives
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0
Pension Plan | U.S. Plans | Level 3 | Alternatives – Partnerships
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	5	86
Pension Plan | U.S. Plans | Level 3 | Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | U.S. Plans | Net asset value | Equity investments measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	189	154
Pension Plan | U.S. Plans | Net asset value | Fixed income investments measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	26	27
Pension Plan | U.S. Plans | Net asset value | Alternatives – Partnerships
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	74	78
Pension Plan | Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	776	764	$ 702
Pension Plan | Non-U.S. Plans | International equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	180	170
Pension Plan | Non-U.S. Plans | Total equity investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	180	170
Pension Plan | Non-U.S. Plans | Other fixed income investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	219	228
Pension Plan | Non-U.S. Plans | Total fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	290	417
Pension Plan | Non-U.S. Plans | Commingled funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	2	3
Pension Plan | Non-U.S. Plans | Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	9	12
Pension Plan | Non-U.S. Plans | Insurance contract
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	131
Pension Plan | Non-U.S. Plans | Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	185	176
Pension Plan | Non-U.S. Plans | Level 1 | International equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	180	170
Pension Plan | Non-U.S. Plans | Level 1 | Total equity investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	180	170
Pension Plan | Non-U.S. Plans | Level 1 | Other fixed income investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	5	6
Pension Plan | Non-U.S. Plans | Level 1 | Total fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	5	6
Pension Plan | Non-U.S. Plans | Level 1 | Commingled funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 1 | Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 1 | Insurance contract
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0
Pension Plan | Non-U.S. Plans | Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	356	237
Pension Plan | Non-U.S. Plans | Level 2 | International equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 2 | Total equity investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 2 | Other fixed income investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	214	222
Pension Plan | Non-U.S. Plans | Level 2 | Total fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	214	222
Pension Plan | Non-U.S. Plans | Level 2 | Commingled funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	2	3
Pension Plan | Non-U.S. Plans | Level 2 | Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	9	12
Pension Plan | Non-U.S. Plans | Level 2 | Insurance contract
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	131
Pension Plan | Non-U.S. Plans | Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Total assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 3 | International equity
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 3 | Total equity investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 3 | Other fixed income investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 3 | Total fixed income
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 3 | Commingled funds
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 3 | Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0	0
Pension Plan | Non-U.S. Plans | Level 3 | Insurance contract
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	0
Pension Plan | Non-U.S. Plans | Net asset value | Fixed income investments measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	71	189
Pension Plan | Non-U.S. Plans | Net asset value | Alternative investments measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	127	124
Pension Plan | Non-U.S. Plans | Net asset value | Real estate measured at net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Assets at fair value	$ 37	$ 38

RETIREMENT PENSION PLANS - Chan

RETIREMENT PENSION PLANS - Changes in Level 3, Pension Plan Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of assets — beginning of year	$ 1,505
Fair value of assets — end of year	1,669	$ 1,505
Pension Plan
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of assets — beginning of year	1,505	1,446
Fair value of assets — end of year	1,669	1,505
Pension Plan | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of assets — beginning of year	105	100
Return on Plan Assets: Attributable to Assets Held at Period End	1	6
Purchases	0	0
Settlements	(1)	(1)
Net Transfers Into (Out of) Level 3	(100)	0
Fair value of assets — end of year	5	105
Pension Plan | Level 3 | Private equity
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of assets — beginning of year	19	17
Return on Plan Assets: Attributable to Assets Held at Period End	0	2
Purchases	0	0
Settlements	0	0
Net Transfers Into (Out of) Level 3	(19)	0
Fair value of assets — end of year	0	19
Pension Plan | Level 3 | Alternatives – Partnerships
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of assets — beginning of year	86	83
Return on Plan Assets: Attributable to Assets Held at Period End	1	4
Purchases	0	0
Settlements	(1)	(1)
Net Transfers Into (Out of) Level 3	(81)	0
Fair value of assets — end of year	$ 5	$ 86

RETIREMENT PENSION PLANS - Pe_3

RETIREMENT PENSION PLANS - Pension Plan Estimated Future Contributions and Benefit Payments (Details) - Pension Plan $ in Millions	Sep. 30, 2020USD ($)
Expected employer contributions:
Fiscal 2021	$ 6
Expected benefit payments:
Fiscal 2021	95
Fiscal 2022	95
Fiscal 2023	93
Fiscal 2024	92
Fiscal 2025	91
Fiscal 2026-2030	426
U.S.
Expected employer contributions:
Fiscal 2021	5
Expected benefit payments:
Fiscal 2021	70
Fiscal 2022	70
Fiscal 2023	68
Fiscal 2024	67
Fiscal 2025	66
Fiscal 2026-2030	302
Non- U.S.
Expected employer contributions:
Fiscal 2021	1
Expected benefit payments:
Fiscal 2021	25
Fiscal 2022	25
Fiscal 2023	25
Fiscal 2024	25
Fiscal 2025	25
Fiscal 2026-2030	$ 124

INCOME TAXES - Components of In

INCOME TAXES - Components of Income Before Income Tax (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
U.S. income	$ 268	$ 194	$ 85
Foreign income	58	183	193
INCOME (LOSS) BEFORE INCOME TAXES	$ 326	$ 377	$ 278

INCOME TAXES - Components of th

INCOME TAXES - Components of the Benefit (Provision) for Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Current tax expense:
U.S.									$ 20	$ 1	$ 24
Foreign									16	40	51
State and local									4	1	0
Total current tax expense									40	42	75
Deferred tax expense (benefit):
U.S.									40	34	76
Foreign									(5)	6	(5)
State and local									3	0	3
Total deferred tax expense									38	40	74
Income tax expense	$ 5	$ (13)	$ 73	$ 13	$ 13	$ 21	$ 27	$ 21	$ 78	$ 82	$ 149

INCOME TAXES - Summary of the T

INCOME TAXES - Summary of the Tax Effects of Temporary Differences (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Accrued compensation and benefits	$ 13	$ 19
Accrued product warranties	11	11
Inventory costs	12	7
Receivables	8	8
Asbestos and environmental	5	8
Accrued retiree healthcare benefits	13	16
Retirement pension plans	25	59
Property	9	7
Lease liabilities	18	0
Loss and credit carryforwards	215	230
Other	16	18
Sub-total	345	383
Less: Valuation allowances	(226)	(207)
Deferred income taxes - asset	119	176
Taxes on undistributed income	(11)	(10)
Intangible assets	(65)	(51)
Lease assets	(17)	0
Debt basis difference	(7)	(8)
Deferred income taxes - liability	(100)	(69)
Net deferred income tax assets	$ 19	$ 107

INCOME TAXES - Schedule of Net

INCOME TAXES - Schedule of Net Current and Non-Current Deferred Income Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Other assets (see Note 11)	$ 30	$ 122
Other liabilities (see Note 14)	(11)	(15)
Net deferred income tax assets	$ 19	$ 107

INCOME TAXES - Additional Infor

INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Subsidiary, ownership percentage	100.00%
Estimated tax expense		$ 87	$ 89
Undistributed earnings in foreign subsidiaries on which income taxes have not been provided	$ 1,161	1,163
Gross unrecognized tax benefits	283	276	261	$ 269
Unrecognized tax benefits that would impact effective tax rate	234
Interest on uncertain tax positions accrued	13	12
Penalties on uncertain tax positions accrued	2	$ 1
Income tax penalties and interest benefit	1		$ 4
Income tax expense related to penalties	$ 1

INCOME TAXES - Tax Credit Carry

INCOME TAXES - Tax Credit Carryforwards and Deferred Tax Assets (Details) $ in Millions	Sep. 30, 2020USD ($)
Operating Loss Carryforwards [Line Items]
Net Operating Losses and Tax Credit Carryforwards	$ 215
Valuation Allowances on these Deferred Tax Assets	207
2021-2025
Operating Loss Carryforwards [Line Items]
Net Operating Losses and Tax Credit Carryforwards	7
Valuation Allowances on these Deferred Tax Assets	6
2026-2035
Operating Loss Carryforwards [Line Items]
Net Operating Losses and Tax Credit Carryforwards	15
Valuation Allowances on these Deferred Tax Assets	13
2036-2040
Operating Loss Carryforwards [Line Items]
Net Operating Losses and Tax Credit Carryforwards	0
Valuation Allowances on these Deferred Tax Assets	0
Indefinite
Operating Loss Carryforwards [Line Items]
Net Operating Losses and Tax Credit Carryforwards	193
Valuation Allowances on these Deferred Tax Assets	$ 188

INCOME TAXES - Income Tax (Bene

INCOME TAXES - Income Tax (Benefit) Provision at the U.S Statutory Rate (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Expense for income taxes at statutory tax rate									$ 68	$ 79	$ 68
State and local income taxes									5	3	2
Foreign income taxed at rates other than statutory									2	11	4
Legislative changes									(10)	1	126
Joint venture equity income									(3)	(6)	(6)
U.S. tax impact on non-U.S. earnings									0	0	4
Nondeductible expenses									11	16	8
Tax credits									(8)	(11)	(9)
Valuation allowances									10	(7)	(40)
Tax audit adjustments									5	0	0
Other									(2)	(4)	(8)
Income tax expense	$ 5	$ (13)	$ 73	$ 13	$ 13	$ 21	$ 27	$ 21	$ 78	$ 82	$ 149

INCOME TAXES - Reconciliation o

INCOME TAXES - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning balance	$ 276	$ 261	$ 269
Additions to tax positions recorded during the current year	4	11	0
Additions to tax positions recorded during the prior year	5	9	0
Reductions to tax position recorded in prior years	(1)	0	(6)
Reductions to tax positions due to lapse of statutory limits	(4)	(4)	(1)
Translation, other	3
Translation, other		(1)	(1)
Unrecognized tax benefits, ending balance	$ 283	$ 276	$ 261

CONTINGENCIES - Additional Info

CONTINGENCIES - Additional Information (Details) $ in Millions	Jul. 09, 2019USD ($)	Jan. 22, 2019USD ($)	Sep. 15, 2018USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2020USD ($)claimsite	Sep. 30, 2019USD ($)claim	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)
Loss Contingencies [Line Items]
Environmental contingencies accrued						$ 16	$ 15
Estimated environmental liabilities for ongoing operations, maintenance and monitoring discounted amount						13
Estimated environmental liabilities for ongoing operations, maintenance and monitoring undiscounted amount						15
Income (loss) related to remeasuring net asbestos liability				$ 31		0	31	$ 0
Maremont Asbestos
Loss Contingencies [Line Items]
Net amount of damages sought		$ 51
Income (loss) related to remeasuring net asbestos liability		$ 31
Company contributions to trust in management of asbestos claims	$ 48
Rockwell Asbestos
Loss Contingencies [Line Items]
Environmental contingencies accrued						$ 79	$ 93
Number of pending asbestos-related claims | claim						1,200	1,400
Period for incurring loss						38 years
Possible claims						$ 78	$ 91
Litigation settlement			$ 3
Insurance receivable			$ 28
Asbestos-related insurance recoveries						$ 62	61
Period for settlement						38 years
Insurance Settlement | Rockwell Asbestos
Loss Contingencies [Line Items]
Litigation settlement					$ 32
Reduction in litigation settlement expense					10			(12)	$ (10)
Loss contingency accrual					22
Insurance receivable					$ 12
Other Income (expense)
Loss Contingencies [Line Items]
Environmental remediation costs						$ 6	3	12
Minimum
Loss Contingencies [Line Items]
Environmental liabilities discounted rate						1.50%
Maximum
Loss Contingencies [Line Items]
Environmental liabilities discounted rate						2.25%
Superfund Sites
Loss Contingencies [Line Items]
Environmental costs reasonably possible						$ 24
Environmental contingencies accrued						11	11
Environmental remediation costs						4	2	12
Non-Superfund Sites
Loss Contingencies [Line Items]
Environmental costs reasonably possible						14
Environmental contingencies accrued						5	4
Environmental remediation costs						$ 2	$ 2	$ 2
Super Fund
Loss Contingencies [Line Items]
Number of superfund sites | site						10

CONTINGENCIES - Environmental L

CONTINGENCIES - Environmental Loss Contingencies by Site (Details) $ in Millions	12 Months Ended
	Sep. 30, 2020USD ($)
Accrual for Environmental Loss Contingencies [Roll Forward]
Environmental Contingencies, beginning balance	$ 15
Payments and other	(5)
Accruals	6
Environmental Contingencies, ending balance	16
Superfund Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Environmental Contingencies, beginning balance	11
Payments and other	(4)
Accruals	4
Environmental Contingencies, ending balance	11
Non-Superfund Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Environmental Contingencies, beginning balance	4
Payments and other	(1)
Accruals	2
Environmental Contingencies, ending balance	$ 5

CONTINGENCIES - Asbestos Relate

CONTINGENCIES - Asbestos Related Reserves and Recoveries (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Loss Contingencies [Line Items]
Asbestos-related liabilities	$ 16	$ 15
Rockwell Asbestos
Loss Contingencies [Line Items]
Pending and future claims	78	91
Billed but unpaid claims	1	2
Asbestos-related liabilities	79	93
Asbestos-related insurance recoveries	$ 62	$ 61

BUSINESS SEGMENT INFORMATION -

BUSINESS SEGMENT INFORMATION - Additional Information (Details) - segment	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Number of reportable segments	2
AB Volvo
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of sales to major customers	21.00%	22.00%	23.00%
Daimler AG
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of sales to major customers	17.00%	19.00%	17.00%
PACCAR
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of sales to major customers	12.00%	13.00%	12.00%
Navistar | Revenue from Contract with Customer Benchmark | Customer Concentration Risk
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of sales to major customers	8.00%	10.00%	9.00%

BUSINESS SEGMENT INFORMATION _2

BUSINESS SEGMENT INFORMATION - Summary of Segment Information (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total sales	$ 758	$ 514	$ 871	$ 901	$ 1,028	$ 1,166	$ 1,156	$ 1,038	$ 3,044	$ 4,388	$ 4,178
External Sales
Segment Reporting Information [Line Items]
Total sales									3,044	4,388	4,178
Intersegment Sales
Segment Reporting Information [Line Items]
Total sales									0	0	0
Commercial Truck
Segment Reporting Information [Line Items]
Total sales									2,080	3,307
Aftermarket and Industrial
Segment Reporting Information [Line Items]
Total sales									964	1,081
Operating Segments | Commercial Truck
Segment Reporting Information [Line Items]
Total sales									2,190	3,456	3,325
Operating Segments | Commercial Truck | External Sales
Segment Reporting Information [Line Items]
Total sales									2,080	3,307	3,171
Operating Segments | Commercial Truck | Intersegment Sales
Segment Reporting Information [Line Items]
Total sales									110	149	154
Operating Segments | Aftermarket and Industrial
Segment Reporting Information [Line Items]
Total sales									981	1,100	1,024
Operating Segments | Aftermarket and Industrial | External Sales
Segment Reporting Information [Line Items]
Total sales									964	1,081	1,007
Operating Segments | Aftermarket and Industrial | Intersegment Sales
Segment Reporting Information [Line Items]
Total sales									17	19	17
Elims
Segment Reporting Information [Line Items]
Total sales									(127)	(168)	(171)
Elims | External Sales
Segment Reporting Information [Line Items]
Total sales									0	0	0
Elims | Intersegment Sales
Segment Reporting Information [Line Items]
Total sales									$ (127)	$ (168)	$ (171)

BUSINESS SEGMENT INFORMATION _3

BUSINESS SEGMENT INFORMATION - Segment Income Attributable to Parent (Details) - USD ($) $ in Millions	Jan. 22, 2019	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Interest expense, net										$ (66)	$ (57)	$ (67)
Benefit (provision) for income taxes		$ (5)	$ 13	$ (73)	$ (13)	$ (13)	$ (21)	$ (27)	$ (21)	(78)	(82)	(149)
Depreciation and amortization										(101)	(87)	(84)
Restructuring costs			(12)	(10)	(5)	(10)	(1)	(1)		(27)	(8)	(6)
Pension settlement loss										0	0	(6)
Asset impairment charges										(8)	(10)	(3)
Income from WABCO distribution termination										265	0	0
Noncontrolling interests										(4)	(5)	(9)
Income from continuing operations attributable to Meritor, Inc.		$ 1	$ (36)	$ 240	$ 39	$ 42	$ 85	$ 73	90	244	290	120
Asbestos related liability remeasurement									$ 31	0	31	0
Commercial Truck
Segment Reporting Information [Line Items]
Depreciation and amortization										(76)	(73)	(72)
Aftermarket and Industrial
Segment Reporting Information [Line Items]
Depreciation and amortization										(25)	(14)	(12)
Operating Segments
Segment Reporting Information [Line Items]
Segment adjusted EBITDA										266	517	487
Operating Segments | Commercial Truck
Segment Reporting Information [Line Items]
Segment adjusted EBITDA										116	342	345
Restructuring costs										(19)	(5)	(1)
Operating Segments | Aftermarket and Industrial
Segment Reporting Information [Line Items]
Segment adjusted EBITDA										150	175	142
Restructuring costs										(8)	(3)	(4)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Unallocated legacy and corporate income (expense), net										6	3	(13)
Interest expense, net										(66)	(57)	(67)
Gain on sale of equity investment										0	0	0
Benefit (provision) for income taxes										(78)	(82)	(149)
Depreciation and amortization										(101)	(87)	(84)
Loss on sale of receivables										(4)	(6)	(5)
Restructuring costs										(27)	(8)	(6)
Transaction costs										(5)	(6)	0
Asbestos related items										0	31	(25)
Pension settlement loss										0	0	(6)
Asset impairment charges										(8)	(10)	(3)
Income from WABCO distribution termination										265	0	0
Noncontrolling interests										(4)	(5)	(9)
Pension Plan
Segment Reporting Information [Line Items]
Pension settlement loss										$ 0	0	(6)
U.K. Plan | Pension Plan
Segment Reporting Information [Line Items]
Pension settlement loss												$ (6)
Maremont Asbestos
Segment Reporting Information [Line Items]
Asbestos related liability remeasurement	$ 31
Maremont Asbestos | Segment Reconciling Items
Segment Reporting Information [Line Items]
Asbestos related liability remeasurement											$ 31

BUSINESS SEGMENT INFORMATION _4

BUSINESS SEGMENT INFORMATION - Schedule of Segment Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total depreciation and amortization	$ 101	$ 87	$ 84
Total capital expenditures	85	103	104
Total assets	2,884	2,815
Operating Segments
Segment Reporting Information [Line Items]
Total assets	2,324	2,474
Corporate
Segment Reporting Information [Line Items]
Total assets	714	567
Segment Reconciling Items
Segment Reporting Information [Line Items]
Total depreciation and amortization	101	87	84
Less: Accounts receivable sold under off-balance sheet factoring programs	(154)	(226)
Commercial Truck
Segment Reporting Information [Line Items]
Total depreciation and amortization	76	73	72
Total capital expenditures	68	88	88
Commercial Truck | Operating Segments
Segment Reporting Information [Line Items]
Total assets	1,666	1,745
Aftermarket and Industrial
Segment Reporting Information [Line Items]
Total depreciation and amortization	25	14	12
Total capital expenditures	17	15	$ 16
Aftermarket and Industrial | Operating Segments
Segment Reporting Information [Line Items]
Total assets	$ 658	$ 729

BUSINESS SEGMENT INFORMATION _5

BUSINESS SEGMENT INFORMATION - Schedule of Revenues and Assets by Geographical Areas (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales	$ 758	$ 514	$ 871	$ 901	$ 1,028	$ 1,166	$ 1,156	$ 1,038	$ 3,044	$ 4,388	$ 4,178
Total assets excluding discontinued operations	2,884				2,815				2,884	2,815
U.S.
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									1,783	2,622	2,289
Total assets excluding discontinued operations	1,458				1,504				1,458	1,504
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									54	69	72
Total assets excluding discontinued operations	35				39				35	39
Mexico
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									147	249	221
Total assets excluding discontinued operations	190				197				190	197
Total North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									1,984	2,940	2,582
Total assets excluding discontinued operations	1,683				1,740				1,683	1,740
Sweden
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									202	276	311
Total assets excluding discontinued operations	136				130				136	130
Italy
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									166	234	243
Total assets excluding discontinued operations	111				81				111	81
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									114	165	179
Total assets excluding discontinued operations	270				241				270	241
Other Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									139	91	103
Total assets excluding discontinued operations	269				173				269	173
Total Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									621	766	836
Total assets excluding discontinued operations	786				625				786	625
Brazil
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									172	248	224
Total assets excluding discontinued operations	132				187				132	187
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									135	153	196
Total assets excluding discontinued operations	130				124				130	124
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									72	197	231
Total assets excluding discontinued operations	76				84				76	84
Other Asia-Pacific
Revenues from External Customers and Long-Lived Assets [Line Items]
Total sales									60	84	$ 109
Total assets excluding discontinued operations	$ 77				$ 55				$ 77	$ 55

QUARTERLY FINANCIAL INFORMATI_3

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) - Summary of Unaudited Quarterly Results (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Sales	$ 758	$ 514	$ 871	$ 901	$ 1,028	$ 1,166	$ 1,156	$ 1,038	$ 3,044	$ 4,388	$ 4,178
Cost of sales	(699)	(486)	(757)	(774)	(882)	(987)	(982)	(897)	(2,716)	(3,748)	(3,553)
GROSS MARGIN	59	28	114	127	146	179	174	141	328	640	625
Benefit (provision) for income taxes	(5)	13	(73)	(13)	(13)	(21)	(27)	(21)	(78)	(82)	(149)
NET INCOME	0	(34)	242	41	41	89	74	92	249	296	126
Net income (loss) from continuing operations attributable to Meritor, Inc.	1	(36)	240	39	42	85	73	90	244	290	120
Net income (loss) attributable to Meritor, Inc.	$ 1	$ (36)	$ 241	$ 39	$ 43	$ 86	$ 72	$ 90	$ 245	$ 291	$ 117
Basic earnings (loss) per share from continuing operations (in dollars per share)	$ 0.01	$ (0.50)	$ 3.27	$ 0.50	$ 0.51	$ 1.02	$ 0.88	$ 1.06	$ 3.30	$ 3.49	$ 1.37
Diluted earnings (loss) per share from continuing operations (in dollars per share)	$ 0.01	$ (0.50)	$ 3.19	$ 0.48	$ 0.50	$ 0.99	$ 0.85	$ 1.03	$ 3.23	$ 3.36	$ 1.31

QUARTERLY FINANCIAL INFORMATI_4

QUARTERLY FINANCIAL INFORMATION (UNAUDITED) - Additional Information (Details) - USD ($) $ in Millions	Mar. 13, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Quarterly Financial Information [Line Items]
Restructuring costs		$ 12	$ 10	$ 5	$ 10	$ 1	$ 1		$ 27	$ 8	$ 6
Income from WABCO distribution termination									265	0	0
Asbestos related liability remeasurement								$ 31	0	31	$ 0
Repatriation of foreign earnings expense (benefit)									$ 9	$ (12)
WABCO Holdings Inc. | Meritor WABCO JV
Quarterly Financial Information [Line Items]
Income from WABCO distribution termination	$ 265		$ 265

OPERATING CASH FLOWS AND OTHE_3

OPERATING CASH FLOWS AND OTHER SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Operating Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
OPERATING ACTIVITIES
Net income	$ 0	$ (34)	$ 242	$ 41	$ 41	$ 89	$ 74	$ 92	$ 249	$ 296	$ 126
Less: Income (loss) from discontinued operations, net of tax									1	1	(3)
Income from continuing operations									248	295	129
Adjustments to income from continuing operations to arrive at cash provided by operating activities:
Depreciation and amortization									101	87	84
Deferred income tax expense									38	40	74
Restructuring costs									27	8	6
Loss on debt extinguishment									0	0	8
Asset impairment									8	10	3
Equity in earnings of affiliates									(14)	(31)	(27)
Stock compensation expense									7	18	20
Provision for doubtful accounts									0	0	(1)
Pension and retiree medical income									(42)	(37)	(31)
Settlement loss									0	0	6
Asbestos related liability remeasurement								$ (31)	0	(31)	0
Contribution to Maremont trust									0	(48)	0
Dividends received from equity method investments									10	23	17
Pension and retiree medical contributions									(15)	(16)	(21)
Restructuring payments									(25)	(5)	(8)
Changes in off-balance sheet receivable securitization and factoring programs									(77)	(18)	11
Changes in assets and liabilities, excluding effects of acquisitions, divestitures, foreign currency adjustments and discontinued operations:
Receivables									147	80	(98)
Inventories									100	9	(112)
Accounts payable									(186)	(103)	97
Other current assets and liabilities									(64)	(3)	36
Other assets and liabilities									2	(22)	59
Operating cash flows provided by continuing operations									265	256	252
Operating cash flows used for discontinued operations									0	0	(1)
CASH PROVIDED BY OPERATING ACTIVITIES									$ 265	$ 256	$ 251

OPERATING CASH FLOWS AND OTHE_4

OPERATING CASH FLOWS AND OTHER SUPPLEMENTAL FINANCIAL INFORMATION - Schedule of Supplemental Disclosures (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Balance sheet data:
Allowance for doubtful accounts	$ 3	$ 3	$ 4
Statement of operations data:
Maintenance and repairs expense	47	55	52
Research, development and engineering expense	74	75	73
Depreciation expense	87	76	74
Rental expense	19
Rental expense		19	18
Interest income	4	4	3
Interest expense	(70)	(61)	(70)
Statement of cash flows data:
Interest payments, net of receipts	48	41	49
Income tax payments, net of refunds	55	64	33
Non-cash investing activities - capital asset additions from finance leases	$ 0	$ 0	$ 4