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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | Mar. 31, 2022 | Sep. 30, 2021
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Loss Contingencies [Line Items] |  |
Accrued Environmental Loss Contingencies, Current | $ 50 | $ 48
Accrued Environmental Loss Contingencies, Noncurrent | 34 | 54
Accrual for Environmental Loss Contingencies, Total | 84 | 102
Conditional asset retirement obligations | 29 | 29
Total asbestos-related assets | 362 | 378
Estimated asbestos related net liability on a discounted basis | 86 | 80
Restricted Cash | 33 | 6
Insurable liabilities, total | 320 | 325
Insurance Settlements Receivable, Current | 5 | 5
Insurance Settlements Receivable, Noncurrent | 15 | 15
Total insurable receivables | 20 | 20
Asbestos Issue [Member] |  |
Loss Contingencies [Line Items] |  |
Other current liabilities | 58 | 58
Other noncurrent liabilities | 390 | 400
Total asbestos-related liabilities | 448 | 458
Restricted Cash | 6 | 6
Restricted Investments | 299 | 314
Total restricted assets | 305 | 320
Insurance recoveries for asbestos-related liabilities | 57 | 58
Other Current Liabilities |  |
Loss Contingencies [Line Items] |  |
Insurable liabilities | 82 | 77
Accrued Compensation and Benefits [Member] |  |
Loss Contingencies [Line Items] |  |
Insurable liabilities | 22 | 22
Other Noncurrent Liabilities [Member] |  |
Loss Contingencies [Line Items] |  |
Insurable liabilities | 216 | 226
Other Current Assets |  |
Loss Contingencies [Line Items] |  |
Asbestos-related assets, current | 36 | 13
Other Noncurrent Assets |  |
Loss Contingencies [Line Items] |  |
Asbestos-related assets, noncurrent | $ 326 | $ 365

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