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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2020 | Sep. 30, 2019
Loss Contingencies [Line Items] |  |  |
Reserves for environmental liabilities |  | $ 143 | $ 159
Accrued Environmental Loss Contingencies, Current |  | 52 | 52
Accrued Environmental Loss Contingencies, Noncurrent |  | 91 | 107
Conditional asset retirement obligations |  | 30 | 30
Estimated asbestos related net liability on a discounted basis |  | 165 | 141
Liability for Asbestos and Environmental Claims, Gross |  | 498 | 507
Restricted Cash and Investments |  | 333 | 366
Restricted Cash and Cash Equivalents |  | 13 | 16
Insurance Recoveries |  | 69 | 77
Insurable liabilities |  | 363 | 379
Insurance Settlements Receivable |  | 23 | 23
Insurance Settlements Receivable, Current |  | 5 | 5
Insurance Settlements Receivable, Noncurrent |  | 18 | 18
Asbestos Issue [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Cash Equivalents |  | 13 | 16
Restricted Investments |  | 251 | 273
Accrued Compensation and Benefits [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Insurable liabilities |  | 22 | 22
Other Current Assets |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Investments |  | 62 | 46
Other Noncurrent Assets |  |  |
Loss Contingencies [Line Items] |  |  |
Restricted Cash and Investments |  | 271 | 320
Other Noncurrent Liabilities [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for Asbestos and Environmental Claims, Gross |  | 448 | 457
Insurable liabilities |  | 256 | 258
Other Current Liabilities |  |  |
Loss Contingencies [Line Items] |  |  |
Liability for Asbestos and Environmental Claims, Gross |  | 50 | 50
Insurable liabilities |  | $ 85 | $ 99
Stanton Street Facility, Marinette, WI [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Environmental Remediation Expense | $ 140 |  |

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