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Derivative Instruments and Hedging Activities - Gains (Losses) on Net Investment Hedges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | $ (48) | $ (41) | $ (2) | $ (1)
Foreign currency-denominated debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | (63) | 4 | 81 | (25)
Currency Swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | $ (19) | $ 21 | 47 | $ (34)
Terminated Currency Swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax |  |  | $ (18) |

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