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Income Taxes- Reconciliation of Beginning and Ending Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]    
Beginning balance $ 64 $ 7
Additions based on positions taken in current year 0 58
Reductions related to statute of limitation lapses and audit payments (4) (1)
Ending balance $ 60 $ 64