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Guarantees - Changes in Carrying Amount of Product Warranty Liability (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Movement in Standard Product Warranty Accrual [Roll Forward]    
Balance at beginning of period $ 180 $ 192
Accruals for warranties issued during the period 99 82
Settlements made (in cash or in kind) during the period (79) (79)
Changes in estimates to pre-existing warranties 12 (9)
Currency translation 1 (7)
Balance at end of period $ 213 $ 179