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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Sep. 30, 2024
--- | --- | ---
Loss Contingencies [Line Items] |  |
Reserve for environmental liabilities, current | $ 23 | $ 32
Reserve for environmental liabilities, noncurrent | 170 | 179
Total reserves for environmental liabilities | 193 | 211
Total asbestos-related liabilities | 395 | 408
Total asbestos-related assets | 328 | 334
Insurance Settlements Receivable, Asbestos-Related | 44 | 47
Net asbestos-related liabilities | 67 | 74
Restricted |  |
Total self-insured liabilities | 384 | 351
Insurance receivables, current | 5 | 5
Insurance receivables, noncurrent | 13 | 13
Total insurance receivables | 18 | 18
Asbestos Issue |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 284 | 287
Restricted |  |
Cash | 6 | 6
Investments | 278 | 281
Other current liabilities |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related liabilities | 58 | 58
Restricted |  |
Total self-insured liabilities | 96 | 92
Other noncurrent liabilities |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related liabilities | 337 | 350
Restricted |  |
Total self-insured liabilities | 256 | 239
Other current assets |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 14 | 14
Other noncurrent assets |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 314 | 320
Accrued compensation and benefits |  |
Restricted |  |
Total self-insured liabilities | $ 32 | $ 20

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