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Guarantees - Changes in Carrying Amount of Product Warranty Liability (Details)
$ in Millions
9 Months Ended
Jun. 30, 2024
USD ($)
Movement in Standard Product Warranty Accrual [Roll Forward]  
Balance at September 30, 2023 $ 203
Accruals for warranties issued during the period 107
Settlements made (in cash or in kind) during the period (101)
Changes in estimates to pre-existing warranties 26
Currency translation (2)
Balance at June 30, 2024 $ 233