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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