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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Unrecognized Tax Benefits    
Balance at beginning of year $ 52 $ 49
Change in tax positions of prior years 15 3
Change in tax positions of current year 0 0
Reduction in tax positions for statute expirations (1) 0
Reduction in tax positions for audit settlements (33) 0
Balance at end of year $ 33 $ 52