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Derivative Instruments and Hedging Activities Disclosure - Gains (Losses) on Net Investment Hedges (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Foreign currency translation adjustments | $ (109) | $ (166) | $ (91)
Foreign currency-denominated debt |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Foreign currency translation adjustments | (107) | (96) | (155)
Currency Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Foreign currency translation adjustments | (18) | (71) | (70)
Terminated Currency Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Foreign currency translation adjustments | $ (42) | $ 9 | $ 13

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