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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Unrecognized tax benefits: |  |  |  |
Balance, January 1 |  | $ 314 | $ 298 | $ 245
Increases as a result of tax positions taken during the current year |  | 37 | 73 | 32
Decreases of tax positions taken during prior years | $ (22) | (53) | (61) | (21)
Increases of tax positions taken during prior years |  | 10 | 6 | 46
Decreases as a result of settlements with taxing authorities and the expiration of statutes of limitations |  | (3) | (2) | (2)
Effect of foreign currency rate movements |  | (9) | 0 | (2)
Balance, December 31 |  | $ 296 | $ 314 | $ 298

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