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Product Warranties - Changes in Carrying Amount of Product Warranty liability (Detail) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 167 $ 156
Accruals for warranties issued during the period 64 47
Accruals related to pre-existing warranties 21 0
Settlements made (in cash or in kind) during the period (52) (44)
Currency translation 1 0
Balance at end of period $ 201 $ 159