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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024
Derivative [Line Items] |  |  |  |  |  |
Net gains (losses) on derivative instruments |  | $ (4,000,000) | $ 12,000,000 | $ 11,000,000 | $ (3,000,000) |
Pre-tax gains (losses) associated with net investment hedges |  | (33,000,000) | 17,000,000 | 22,000,000 | (15,000,000) |
Maximum amount of loss |  | 256,000,000 |  | 256,000,000 |  |
Cash collateral received |  | 45,000,000 | 6,000,000 | 45,000,000 | 6,000,000 | $ 14,000,000
Revolver | Credit Agreement |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net gains (losses) on derivative instruments | $ 32,000,000 |  |  |  |  |
IRPAs |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount |  | 0 | $ 0 | 0 | $ 0 | $ 0
Pre-tax net gains associated with interest rate hedges |  | $ 8,000,000 |  | $ 8,000,000 |  |
Forward foreign currency exchange contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative notional amount percent of required need coverage |  | 90.00% |  | 90.00% |  |

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