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Income Tax Expense (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Unrecognized Tax Benefits | $ 3 | $ 11 | $ 11
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 8 |  |
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | $ (8) | $ 0 |

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