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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018
Loss Contingencies [Line Items] |  |
Estimated asbestos related net liability on a discounted basis | $ 194 | $ 173
Reserves for environmental liabilities | 32 | 37
Conditional asset retirement obligations | 29 | 29
Accrued Environmental Loss Contingencies, Current | 13 | 10
Accrued Environmental Loss Contingencies, Noncurrent | 19 | 27
Liability for Asbestos and Environmental Claims, Gross | 546 | 550
Restricted Cash and Investments | 352 | 377
Restricted Cash and Cash Equivalents | 20 | 15
Insurance Recoveries | 89 | 90
Insurable liabilities | 415 | 417
Insurance Settlements Receivable, Current | 6 |
Insurance Settlements Receivable | 26 |
Insurance Settlements Receivable, Noncurrent | 20 |
Asbestos Issue [Member] |  |
Loss Contingencies [Line Items] |  |
Restricted Cash and Cash Equivalents | 20 | 6
Restricted Investments | 243 | 281
Accrued Compensation and Benefits [Member] |  |
Loss Contingencies [Line Items] |  |
Insurable liabilities | 22 | 22
Other Current Assets |  |
Loss Contingencies [Line Items] |  |
Restricted Cash and Investments | 33 | 33
Other Noncurrent Assets |  |
Loss Contingencies [Line Items] |  |
Restricted Cash and Investments | 319 | 344
Other Noncurrent Liabilities [Member] |  |
Loss Contingencies [Line Items] |  |
Liability for Asbestos and Environmental Claims, Gross | 491 | 495
Insurable liabilities | 299 | 300
Other Current Liabilities |  |
Loss Contingencies [Line Items] |  |
Liability for Asbestos and Environmental Claims, Gross | 55 | 55
Insurable liabilities | $ 94 | $ 95

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