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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns    
Balance at beginning of year $ 48 $ 48
Change in tax positions of prior years 1 0
Change in tax positions of current year 0 0
Reduction in tax positions for statute expirations 0 0
Reduction in tax positions for audit settlements 0 0
Balance at end of year $ 49 $ 48