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Commitments and Contingencies (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |
Reserves for environmental liabilities | $ 51 | $ 51 | $ 51
Accrued Environmental Loss Contingencies, Current | 10 | 10 |
Accrued Environmental Loss Contingencies, Noncurrent | 41 | 41 |
Conditional asset retirement obligations | 61 | 61 | 74
Estimated asbestos related net liability on a discounted basis | 181 | 181 | 148
Liability for Asbestos and Environmental Claims, Gross | 573 | 573 | 548
Restricted Cash and Investments | 392 | 392 | 400
Restricted Cash and Cash Equivalents | 31 | 31 | 88
Insurance Recoveries |  | 101 | 120
Insurable liabilities | 445 | 445 | 422
Insurance Settlements Receivable | 46 | 46 |
Insurance Settlements Receivable, Current | 31 | 31 |
Insurance Settlements Receivable, Noncurrent | $ 15 | $ 15 | 21
Arbitration award against the Company | 50 |  |
Accrued interest while arbitration award remains outstanding | 9.56% |  |
Class actions lawsuits against the Company |  | 12 |
Other possible individual product liability claims |  | 490 |
Asbestos Issue [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Cash Equivalents | $ 22 | $ 22 | 16
Restricted Investments | 269 | $ 269 | 264
Selling, general and administrative |  |  |
Loss Contingencies [Line Items] |  |  |
Arbitration award against the Company |  | 50 |
Other current liabilities |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for Asbestos and Environmental Claims, Gross | 48 | $ 48 | 35
Insurable liabilities | 122 | 122 | 60
Accrued Compensation and Benefits [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Insurable liabilities | 22 | 22 | 28
Other Noncurrent Liabilities [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for Asbestos and Environmental Claims, Gross | 525 | 525 | 513
Insurable liabilities | 301 | 301 | 334
Other current assets |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Investments | 53 | 53 | 41
Other noncurrent assets |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Investments | $ 339 | $ 339 | $ 359

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