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Commitments and Contingencies (Detail)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Loss Contingencies [Line Items]      
Reserves for environmental liabilities $ 51 $ 42 $ 51
Accrued Environmental Loss Contingencies, Current 10 11 10
Accrued Environmental Loss Contingencies, Noncurrent 41 31 41
Conditional asset retirement obligations 61 45 61
Estimated asbestos related net liability on a discounted basis 181 173 181
Liability for Asbestos and Environmental Claims, Gross 573 550 573
Restricted Cash and Investments 392 377 392
Restricted Cash and Cash Equivalents 31 15 31
Insurance Recoveries   90 101
Insurable liabilities 445 417 445
Insurance Settlements Receivable 46 26 46
Insurance Settlements Receivable, Current 31 6 31
Insurance Settlements Receivable, Noncurrent $ 15 $ 20 15
Arbitration award against the Company 50    
Accrued interest while arbitration award remains outstanding 9.56%    
Class actions lawsuits against the Company   19  
Asbestos Issue [Member]      
Loss Contingencies [Line Items]      
Restricted Cash and Cash Equivalents $ 22 $ 6 22
Restricted Investments $ 269 281 269
Selling, general and administrative      
Loss Contingencies [Line Items]      
Arbitration award against the Company 50    
Other current liabilities      
Loss Contingencies [Line Items]      
Liability for Asbestos and Environmental Claims, Gross $ 48 55 48
Insurable liabilities 122 95 122
Accrued Compensation and Benefits [Member]      
Loss Contingencies [Line Items]      
Insurable liabilities 22 22 22
Other Noncurrent Liabilities [Member]      
Loss Contingencies [Line Items]      
Liability for Asbestos and Environmental Claims, Gross 525 495 525
Insurable liabilities 301 300 301
Other current assets      
Loss Contingencies [Line Items]      
Restricted Cash and Investments 53 33 53
Other noncurrent assets      
Loss Contingencies [Line Items]      
Restricted Cash and Investments $ 339 $ 344 $ 339