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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, 2025 | Sep. 30, 2024
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Carrying (Reported) Amount, Fair Value Disclosure [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents |  | $ 168 |  | $ 300 |
Restricted investments |  | 345 | [1],[2] | 368 | [3],[4]
Investment of captive insurance company |  | 9 | [5] | 7 | [6]
Foreign currency derivatives | [7] |  |  | 1 |
Total assets at fair value |  | 525 |  | 676 |
Liabilities |  |  |  |  |
Foreign currency derivatives | [8] |  |  | 1 |
Total liabilities at fair value |  |  |  | 3 |
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Commodity Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Commodity derivatives | [9] | $ 3 |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Accrued Liabilities, Current |  |  |
Liabilities |  |  |  |  |
Commodity derivatives | [8] |  |  | $ 2 |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] |  |  |  | Accrued Liabilities, Current |
Estimate of Fair Value, Fair Value Disclosure [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents |  | $ 168 |  | $ 300 |
Restricted investments |  | 345 | [1],[2] | 368 | [3],[4]
Investment of captive insurance company |  | 9 | [5] | 7 | [6]
Foreign currency derivatives | [7] |  |  | 1 |
Total assets at fair value |  | 525 |  | 676 |
Liabilities |  |  |  |  |
Foreign currency derivatives | [8] |  |  | 1 |
Total liabilities at fair value |  |  |  | 3 |
Estimate of Fair Value, Fair Value Disclosure [Member] | Commodity Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Commodity derivatives | [9] | $ 3 |  |  |
Derivative Asset, Statement of Financial Position [Extensible Enumeration] |  | Accrued Liabilities, Current |  |  |
Liabilities |  |  |  |  |
Commodity derivatives | [8] |  |  | $ 2 |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] |  |  |  | Accrued Liabilities, Current |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Assets |  |  |  |  |
Cash and cash equivalents |  | $ 168 |  | $ 300 |
Restricted investments |  | 345 | [1],[2] | 368 | [3],[4]
Investment of captive insurance company |  | 9 | [5] | 7 | [6]
Foreign currency derivatives | [7] |  |  | 0 |
Total assets at fair value |  | 522 |  | 675 |
Liabilities |  |  |  |  |
Foreign currency derivatives | [8] |  |  | 0 |
Total liabilities at fair value |  |  |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Commodity Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Commodity derivatives | [9] | 0 |  |  |
Liabilities |  |  |  |  |
Commodity derivatives | [8] |  |  | 0 |
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 | [7] |  |  | 1 |
Total assets at fair value |  | 3 |  | 1 |
Liabilities |  |  |  |  |
Foreign currency derivatives | [8] |  |  | 1 |
Total liabilities at fair value |  |  |  | 3 |
Fair Value, Inputs, Level 2 [Member] | Commodity Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Commodity derivatives | [9] | 3 |  |  |
Liabilities |  |  |  |  |
Commodity derivatives | [8] |  |  | 2 |
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 | [7] |  |  | 0 |
Total assets at fair value |  | 0 |  | 0 |
Liabilities |  |  |  |  |
Foreign currency derivatives | [8] |  |  | 0 |
Total liabilities at fair value |  |  |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Commodity Derivatives [Member] |  |  |  |  |
Assets |  |  |  |  |
Commodity derivatives | [9] | $ 0 |  |  |
Liabilities |  |  |  |  |
Commodity derivatives | [8] |  |  | $ 0 |
[1] | Includes $222 million related to the Asbestos trust and $123 million related to the Environmental trust
[2] | Includes $272 million within restricted investments and $73 million within other current assets in the Condensed Consolidated Balance Sheet
[3] | Includes $248 million related to the Asbestos trust and $120 million related to the Environmental trust
[4] | Includes $295 million within restricted investments and $73 million within other current assets in the Condensed Consolidated Balance Sheet
[5] | Included in other noncurrent assets in the Condensed Consolidated Balance Sheet
[6] | Included in other noncurrent assets in the Condensed Consolidated Balance Sheet
[7] | Included in accounts receivable, net in the Condensed Consolidated Balance Sheet
[8] | Included in accrued expenses and other liabilities in the Condensed Consolidated Balance Sheet.
[9] | Included in accounts receivable, net in the Condensed Consolidated Balance Sheet.

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