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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Jun. 30, 2019
Sep. 30, 2018
Loss Contingencies [Line Items]    
Estimated asbestos related net liability on a discounted basis $ 167 $ 173
Reserves for environmental liabilities 163 37
Conditional asset retirement obligations 30 29
Accrued Environmental Loss Contingencies, Current 52 10
Accrued Environmental Loss Contingencies, Noncurrent 111 27
Liability for Asbestos and Environmental Claims, Gross 538 550
Restricted Cash and Investments 371 377
Restricted Cash and Cash Equivalents 16 15
Insurance Recoveries 83 90
Insurable liabilities 451 417
Insurance Settlements Receivable, Current 6 6
Insurance Settlements Receivable 26 26
Insurance Settlements Receivable, Noncurrent 20 20
Asbestos Issue [Member]    
Loss Contingencies [Line Items]    
Restricted Cash and Cash Equivalents 16 6
Restricted Investments 272 281
Accrued Compensation and Benefits [Member]    
Loss Contingencies [Line Items]    
Insurable liabilities 22 22
Other Current Assets    
Loss Contingencies [Line Items]    
Restricted Cash and Investments 49 33
Other Noncurrent Assets    
Loss Contingencies [Line Items]    
Restricted Cash and Investments 322 344
Other Noncurrent Liabilities [Member]    
Loss Contingencies [Line Items]    
Liability for Asbestos and Environmental Claims, Gross 483 495
Insurable liabilities 311 300
Other Current Liabilities    
Loss Contingencies [Line Items]    
Liability for Asbestos and Environmental Claims, Gross 55 55
Insurable liabilities 118 $ 95
Stanton Street Facility, Marinette, WI [Member]    
Loss Contingencies [Line Items]    
Environmental Remediation Expense $ 140