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Derivative Instruments and Hedging Activities - Gains (Losses) on Net Investment Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | $ (53) | $ 44 | $ (54) | $ (57)
Foreign currency-denominated debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | 24 | (14) | (1) | (178)
Cross-currency swaps (a) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | 10 | $ (18) | (24) | (119)
Terminated Currency Swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | $ 9 |  | $ 9 | $ 13

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