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Product Warranties - Changes in Carrying Amount of Product Warranty liability (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 167 $ 156
Accruals for warranties issued during the period 22 16
Accruals related to pre-existing warranties 6 (3)
Settlements made (in cash or in kind) during the period (17) (16)
Currency translation 2 1
Balance at end of period $ 180 $ 154