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Guarantees - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Guarantor Obligations [Line Items]    
Post sale contingent tax indemnification liabilities $ 272 $ 290
Maximum length, in years, of a product warranty for it to be recorded in other current liabilities 1 year  
Minimum length, in years, of a product warranty for it to be recorded in other noncurrent liabilities 1 year  
Tax indemnification liabilities related to other divestitures $ 9 11
Business Divestitures, Not Specific [Member]    
Guarantor Obligations [Line Items]    
Post sale contingent tax indemnification liabilities   $ 237