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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, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | $ (41) | $ (21) | $ (1) | $ (101)
Foreign currency-denominated debt |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | 4 | (22) | (25) | (164)
Cross-currency swaps (a) |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | 21 | $ (21) | (34) | $ (101)
Terminated Currency Swap |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net gains (losses) recorded to Accumulated other comprehensive income (loss), net of tax | $ 13 |  | $ 13 |

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