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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Loss Contingencies [Line Items] |  |
Reserve for environmental liabilities, current | $ 31 | $ 66
Reserve for environmental liabilities, noncurrent | 211 | 220
Total reserves for environmental liabilities | 242 | 286
Total asbestos-related liabilities | 422 | 438
Total asbestos-related assets | 301 | 300
Net asbestos-related liabilities | 121 | 138
Restricted |  |
Insurance receivables for asbestos-related liabilities | 50 | 55
Total self-insured liabilities | 333 | 341
Insurance receivables, current | 6 | 10
Insurance receivables, noncurrent | 14 | 20
Total insurance receivables | $ 20 | $ 30
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration] | Other current liabilities | Other current liabilities
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other noncurrent liabilities | Other noncurrent liabilities
Asbestos Issue |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | $ 251 | $ 245
Restricted |  |
Cash | 20 | 6
Investments | 231 | 239
Other current liabilities |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related liabilities | 58 | 58
Restricted |  |
Total self-insured liabilities | $ 86 | $ 89
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Other current liabilities | Other current liabilities
Other noncurrent liabilities |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related liabilities | $ 364 | $ 380
Restricted |  |
Total self-insured liabilities | $ 226 | $ 230
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] | Other noncurrent liabilities | Other noncurrent liabilities
Other current assets |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | $ 28 | $ 37
Other noncurrent assets |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 273 | 263
Accrued compensation and benefits |  |
Restricted |  |
Total self-insured liabilities | $ 21 | $ 22

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