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Product Warranties - Changes in Carrying Amount of Product Warranty liability (Detail) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 315 $ 323
Accruals for warranties issued during the period 48 52
Accruals from acquisition and divestitures 0 1
Accruals related to pre-existing warranties (9) (9)
Settlements made (in cash or in kind) during the period (51) (56)
Currency translation 1 4
Balance at end of period $ 304 $ 315