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Commitments and Contingencies (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Loss Contingencies [Line Items]      
Reserves for environmental liabilities   $ 130 $ 159
Accrued Environmental Loss Contingencies, Current   61 52
Accrued Environmental Loss Contingencies, Noncurrent   69 107
Conditional asset retirement obligations   29 30
Estimated asbestos related net liability on a discounted basis   115 141
Liability for Asbestos and Environmental Claims, Gross   483 507
Restricted Cash and Investments   368 366
Insurance Recoveries   68 77
Insurable liabilities   363 379
Insurance Settlements Receivable   21 23
Insurance Settlements Receivable, Current   5 5
Insurance Settlements Receivable, Noncurrent   16 18
Asbestos Issue [Member]      
Loss Contingencies [Line Items]      
Restricted Cash and Cash Equivalents   9 16
Restricted Investments   291 273
Other current liabilities      
Loss Contingencies [Line Items]      
Liability for Asbestos and Environmental Claims, Gross   49 50
Insurable liabilities   83 99
Accrued Compensation and Benefits [Member]      
Loss Contingencies [Line Items]      
Insurable liabilities   22 22
Other Noncurrent Liabilities [Member]      
Loss Contingencies [Line Items]      
Liability for Asbestos and Environmental Claims, Gross   434 457
Insurable liabilities   258 258
Other current assets      
Loss Contingencies [Line Items]      
Restricted Cash and Investments   39 46
Other noncurrent assets      
Loss Contingencies [Line Items]      
Restricted Cash and Investments   $ 329 $ 320
Stanton Street Facility, Marinette, WI [Member]      
Loss Contingencies [Line Items]      
Environmental Remediation Expense $ 140