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Commitments and Contingencies - Additional Information (Detail) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |
Estimated asbestos related net liability on a discounted basis | $ 166,000,000 | $ 181,000,000 | $ 181,000,000
Reserves for environmental liabilities | 48,000,000 | 51,000,000 | 51,000,000
Conditional asset retirement obligations | 62,000,000 | 61,000,000 | 61,000,000
Accrued Environmental Loss Contingencies, Current | 10,000,000 |  |
Accrued Environmental Loss Contingencies, Noncurrent | 38,000,000 |  |
Liability for Asbestos and Environmental Claims, Gross | 559,000,000 | 573,000,000 | 573,000,000
Restricted Cash and Investments | 393,000,000 | 392,000,000 | 392,000,000
Restricted Cash and Cash Equivalents | 19,000,000 | 31,000,000 | 31,000,000
Insurance Recoveries | 100,000,000 |  | 101,000,000
Insurable liabilities | 434,000,000 | 445,000,000 | 445,000,000
Insurance Settlements Receivable, Current | 6,000,000 | 31,000,000 | 31,000,000
Insurance Settlements Receivable | 21,000,000 | 46,000,000 | 46,000,000
Insurance Settlements Receivable, Noncurrent | $ 15,000,000 | 15,000,000 | 15,000,000
Arbitration award to plaintiff |  | $ 50,000,000 |
Accrued interest while arbitration award remains outstanding |  | 9.56% |
Class actions lawsuits against the Company | 12 |  |
Loss Contingency, Number of Plaintiffs | 32 |  |
Other possible individual product liability claims | 540 |  |
Asbestos Issue [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Cash Equivalents | $ 10,000,000 | $ 22,000,000 | 22,000,000
Restricted Investments | 283,000,000 | 269,000,000 | 269,000,000
Selling, General And Administrative |  |  |
Loss Contingencies [Line Items] |  |  |
Arbitration award to plaintiff |  | 50,000,000 |
Accrued Compensation and Benefits [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Insurable liabilities | 23,000,000 | 22,000,000 | 22,000,000
Other Current Assets |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Investments | 55,000,000 | 53,000,000 | 53,000,000
Other Noncurrent Assets |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Investments | 338,000,000 | 339,000,000 | 339,000,000
Other Noncurrent Liabilities [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for Asbestos and Environmental Claims, Gross | 505,000,000 | 525,000,000 | 525,000,000
Insurable liabilities | 319,000,000 | 301,000,000 | 301,000,000
Other Current Liabilities |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for Asbestos and Environmental Claims, Gross | 54,000,000 | 48,000,000 | 48,000,000
Insurable liabilities | $ 92,000,000 | $ 122,000,000 | $ 122,000,000

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