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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021
Loss Contingencies [Line Items] |  |
Reserve for environmental liabilities, current | $ 66 | $ 48
Reserve for environmental liabilities, noncurrent | 220 | 54
Total reserves for environmental liabilities | 286 | 102
Total asbestos-related liabilities | 438 | 458
Total asbestos-related assets | 300 | 378
Net asbestos-related liabilities | 138 | 80
Restricted |  |
Insurance recoveries for asbestos-related liabilities | 55 | 58
Total insurable liabilities | 341 | 325
Insurance receivables, current | 10 | 5
Insurance receivables, noncurrent | 20 | 15
Total insurable receivables | $ 30 | $ 20
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 | $ 245 | $ 320
Restricted |  |
Cash | 6 | 6
Investments | 239 | 314
Other current liabilities |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related liabilities | 58 | 58
Restricted |  |
Total insurable liabilities | $ 89 | $ 77
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 | $ 380 | $ 400
Restricted |  |
Total insurable liabilities | $ 230 | $ 226
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 | $ 37 | $ 13
Other noncurrent assets |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 263 | 365
Accrued compensation and benefits |  |
Restricted |  |
Total insurable liabilities | $ 22 | $ 22

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