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Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Sep. 30, 2023
Loss Contingencies [Line Items] |  |
Reserve for environmental liabilities, current | $ 31 | $ 31
Reserve for environmental liabilities, noncurrent | 201 | 211
Total reserves for environmental liabilities | 232 | 242
Total asbestos-related liabilities | 417 | 422
Total asbestos-related assets | 321 | 301
Net asbestos-related liabilities | 96 | 121
Restricted |  |
Insurance receivables for asbestos-related liabilities | 50 | 50
Total self-insured liabilities | 328 | 333
Insurance receivables, current | 6 | 6
Insurance receivables, noncurrent | 14 | 14
Total insurance receivables | 20 | 20
Asbestos Issue |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 271 | 251
Restricted |  |
Cash | 19 | 20
Investments | 252 | 231
Other current liabilities |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related liabilities | 58 | 58
Restricted |  |
Total self-insured liabilities | 87 | 86
Other noncurrent liabilities |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related liabilities | 359 | 364
Restricted |  |
Total self-insured liabilities | 219 | 226
Other current assets |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 27 | 28
Other noncurrent assets |  |
Loss Contingencies [Line Items] |  |
Total asbestos-related assets | 294 | 273
Accrued compensation and benefits |  |
Restricted |  |
Total self-insured liabilities | $ 22 | $ 21

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