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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Sep. 30, 2022
Loss Contingencies [Line Items] |  |
Reserve for environmental liabilities, current | $ 42 | $ 66
Reserve for environmental liabilities, noncurrent | 223 | 220
Total reserves for environmental liabilities | 265 | 286
Total asbestos-related liabilities | 428 | 438
Total asbestos-related assets | 312 | 300
Net asbestos-related liabilities | 116 | 138
Restricted |  |
Insurance receivables for asbestos-related liabilities | 53 | 55
Total self-insured liabilities | 347 | 341
Insurance receivables, current | 10 | 10
Insurance receivables, noncurrent | 20 | 20
Total insurance receivables | 30 | 30
Asbestos Issue |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 259 | 245
Restricted |  |
Cash | 6 | 6
Investments | 253 | 239
Other current liabilities |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related liabilities | 58 | 58
Restricted |  |
Total self-insured liabilities | 92 | 89
Other noncurrent liabilities |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related liabilities | 370 | 380
Restricted |  |
Total self-insured liabilities | 233 | 230
Other current assets |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 37 | 37
Other noncurrent assets |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 275 | 263
Accrued compensation and benefits |  |
Restricted |  |
Total self-insured liabilities | $ 22 | $ 22

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