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Fair Value Measurements - Summary of Financial Instruments Subject to Recurring Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
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Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents |  | $ 964 |  | $ 210 |
Restricted investments |  | 423 | [1],[2] | 421 | [3],[4]
Investment of captive insurance company |  | 9 | [5] | 8 | [6]
Foreign currency derivatives |  | 3 | [7] | 1 | [8]
Total assets at fair value |  | 1,405 |  | 645 |
Liabilities |  |  |  |  |
Foreign currency derivatives |  | 2 | [9] | 2 | [10]
Total liabilities at fair value |  | 2 |  |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Total Return Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative assets | [7] | 1 |  |  |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commodity Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative assets |  | 5 | [7] | 5 | [8]
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents |  | 964 |  | 210 |
Restricted investments |  | 423 | [1],[2] | 421 | [3],[4]
Investment of captive insurance company |  | 9 | [5] | 8 | [6]
Foreign currency derivatives |  | 3 | [7] | 1 | [8]
Total assets at fair value |  | 1,405 |  | 645 |
Liabilities |  |  |  |  |
Foreign currency derivatives |  | 2 | [9] | 2 | [10]
Total liabilities at fair value |  | 2 |  |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Total Return Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative assets | [7] | 1 |  |  |
Estimate of Fair Value, Fair Value Disclosure [Member] | Commodity Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative assets |  | 5 | [7] | 5 | [8]
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents |  | 964 |  | 210 |
Restricted investments |  | 423 | [1],[2] | 421 | [3],[4]
Investment of captive insurance company |  | 9 | [5] | 8 | [6]
Foreign currency derivatives |  | 0 | [7] | 0 | [8]
Total assets at fair value |  | 1,396 |  | 639 |
Liabilities |  |  |  |  |
Foreign currency derivatives |  | 0 | [9] | 0 | [10]
Total liabilities at fair value |  | 0 |  |  |
Fair Value, Inputs, Level 1 [Member] | Total Return Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative assets | [7] | 0 |  |  |
Fair Value, Inputs, Level 1 [Member] | Commodity Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative assets |  | 0 | [7] | 0 | [8]
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents |  | 0 |  | 0 |
Restricted investments |  | 0 | [1],[2] | 0 | [3],[4]
Investment of captive insurance company |  | 0 | [5] | 0 | [6]
Foreign currency derivatives |  | 3 | [7] | 1 | [8]
Total assets at fair value |  | 9 |  | 6 |
Liabilities |  |  |  |  |
Foreign currency derivatives |  | 2 | [9] | 2 | [10]
Total liabilities at fair value |  | 2 |  |  |
Fair Value, Inputs, Level 2 [Member] | Total Return Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative assets | [7] | 1 |  |  |
Fair Value, Inputs, Level 2 [Member] | Commodity Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative assets |  | 5 | [7] | 5 | [8]
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents |  | 0 |  | 0 |
Restricted investments |  | 0 | [1],[2] | 0 | [3],[4]
Investment of captive insurance company |  | 0 | [5] | 0 | [6]
Foreign currency derivatives |  | 0 | [7] | 0 | [8]
Total assets at fair value |  |  |  | 0 |
Liabilities |  |  |  |  |
Foreign currency derivatives |  | 0 | [9] | 0 | [10]
Total liabilities at fair value |  | 0 |  |  |
Fair Value, Inputs, Level 3 [Member] | Total Return Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative assets | [7] | 0 |  |  |
Fair Value, Inputs, Level 3 [Member] | Commodity Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Derivative assets |  | $ 0 | [7] | $ 0 | [8]
[1] | Included in restricted investments and $36 million within other current assets in the Condensed Consolidated Balance Sheets
[2] | Includes $300 million related to the Asbestos trust and $123 million related to the Environmental trust
[3] | Included in restricted investments and $37 million within other current assets in the Condensed Consolidated Balance Sheets
[4] | Includes $333 million related to the Asbestos trust and $88 million related to the Environmental trust
[5] | Included in other noncurrent assets in the Condensed Consolidated Balance Sheets
[6] | Included in other noncurrent assets in the Condensed Consolidated Balance Sheets
[7] | Included in accounts receivable in the Condensed Consolidated Balance Sheets
[8] | Included in accounts receivable in the Condensed Consolidated Balance Sheets
[9] | Included in accrued expenses and other liabilities in the Condensed Consolidated Balance Sheets.
[10] | Included in accrued expenses and other liabilities in the Condensed Consolidated Balance Sheets.

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + Details
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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References No definition available. + Details
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- Definition Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=120413173&loc=SL6242262-115580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120413209&loc=SL6242269-115581 + Details
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