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Product Warranties - Changes in Carrying Amount of Product Warranty liability (Detail) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 315 $ 323
Accruals for warranties issued during the period 85 73
Accruals from acquisition and divestitures 2 1
Accruals related to pre-existing warranties (20) (21)
Settlements made (in cash or in kind) during the period (79) (67)
Currency translation 1 0
Balance at end of period $ 304 $ 309