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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Summary of unrecognized income tax benefits      
Unrecognized tax benefits balance at beginning of year $ 35 $ 35 $ 35
Additions for tax positions of current year 6 9 5
Additions for tax positions of prior years 0 0 1
Reductions for tax positions of prior years (6) (3) 0
Reductions for lapses in statutes of limitations (7) (6) (6)
Unrecognized tax benefits balance at end of year $ 28 $ 35 $ 35