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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of unrecognized income tax benefits      
Unrecognized tax benefits balance at beginning of year $ 54 $ 49 $ 49
Additions for tax positions of current year 8 8 8
Additions for tax positions of prior years 0 3 0
Reductions for tax positions of prior years (3) (1) (7)
Reductions for settlements of tax positions (2) 0 (1)
Reductions for lapses in statutes of limitations (20) (5) 0
Unrecognized tax benefits balance at end of year $ 37 $ 54 $ 49