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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Summary of unrecognized income tax benefits      
Unrecognized tax benefits balance at beginning of year $ 37 $ 54 $ 49
Additions for tax positions of current year 6 8 8
Additions for tax positions of prior years 1 0 3
Reductions for tax positions of prior years 0 (3) (1)
Reductions for settlements of tax positions 0 (2) 0
Reductions for lapses in statutes of limitations (6) (20) (5)
Unrecognized tax benefits balance at end of year $ 38 $ 37 $ 54