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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2023
Derivative [Line Items] |  |  |
Hedge percentage for foreign exchange transactional exposures, minimum | 70.00% |  |
Hedge percentage for foreign exchange transactional exposures, maximum | 90.00% |  |
Interest rate swaps |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount | $ 600,000,000 |  | $ 600,000,000
Debt instrument, face amount | 800,000,000 |  | $ 800,000,000
Net Investment Hedging |  |  |
Derivative [Line Items] |  |  |
Pre-tax gains (losses) related to net investment hedges recorded in other comprehensive income | 145,000,000 | $ 269,000,000 |
Pre-tax gains (losses) related to net investment hedges reclassified from other comprehensive income | $ 0 | $ 0 |

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