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Guarantees - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Sep. 30, 2016
Guarantor Obligations [Line Items]        
Post sale contingent tax indemnification liabilities     $ 255 $ 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    
Release of tax indemnification reserve $ 226      
Business Divestitures, Not Specific [Member]        
Guarantor Obligations [Line Items]        
Post sale contingent tax indemnification liabilities     $ 235