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Commitments and Contingencies (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Loss Contingencies [Line Items]      
Document Period End Date   Sep. 30, 2019  
Reserves for environmental liabilities   $ 159 $ 37
Accrued Environmental Loss Contingencies, Current   52 10
Accrued Environmental Loss Contingencies, Noncurrent   107 27
Conditional asset retirement obligations   30 29
Estimated asbestos related net liability on a discounted basis   141 173
Liability for Asbestos and Environmental Claims, Gross   507 550
Restricted Cash and Investments   366 377
Restricted Cash and Cash Equivalents   16 15
Insurance Recoveries   77 90
Insurable liabilities   379 417
Insurance Settlements Receivable   23 26
Insurance Settlements Receivable, Current   5 6
Insurance Settlements Receivable, Noncurrent   18 20
Asbestos Issue [Member]      
Loss Contingencies [Line Items]      
Restricted Cash and Cash Equivalents   16 6
Restricted Investments   273 281
Other current liabilities      
Loss Contingencies [Line Items]      
Liability for Asbestos and Environmental Claims, Gross   50 55
Insurable liabilities   99 95
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   457 495
Insurable liabilities   258 300
Other current assets      
Loss Contingencies [Line Items]      
Restricted Cash and Investments   46 33
Other noncurrent assets      
Loss Contingencies [Line Items]      
Restricted Cash and Investments   $ 320 $ 344
Stanton Street Facility, Marinette, WI [Member]      
Loss Contingencies [Line Items]      
Environmental Remediation Expense $ 140