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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Loss Contingencies [Line Items] |  |
Reserve for environmental liabilities, current | $ 25 | $ 32
Reserve for environmental liabilities, noncurrent | 174 | 179
Total reserves for environmental liabilities | 199 | 211
Total asbestos-related liabilities | 402 | 408
Total asbestos-related assets | 314 | 334
Insurance Settlements Receivable, Asbestos-Related | 45 | 47
Net asbestos-related liabilities | 88 | 74
Restricted |  |
Total self-insured liabilities | 370 | 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 | 269 | 287
Restricted |  |
Cash | 7 | 6
Investments | 262 | 281
Other current liabilities |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related liabilities | 58 | 58
Restricted |  |
Total self-insured liabilities | 99 | 92
Other noncurrent liabilities |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related liabilities | 344 | 350
Restricted |  |
Total self-insured liabilities | 251 | 239
Other current assets |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 15 | 14
Other noncurrent assets |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 299 | 320
Accrued compensation and benefits |  |
Restricted |  |
Total self-insured liabilities | $ 20 | $ 20

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