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Product Warranties - Changes in Carrying Amount of Product Warranty liability (Detail) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 285 $ 315
Accruals for warranties issued during the period 49 48
Accruals related to pre-existing warranties (3) (9)
Settlements made (in cash or in kind) during the period (41) (51)
Currency translation (1) 1
Balance at end of period $ 289 $ 304