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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Unrecognized Tax Benefits      
Balance at beginning of period $ 23 $ 21 $ 18
Reductions based on statute expirations (5) (5) 0
Audit settlement (1) 0 0
Additions to state reserves for prior years 1 7 3
Balance at end of period 18 $ 23 $ 21
Other Disclosures      
Amounts which, if recognized, would affect the effective tax rate 18    
Increase in Unrecognized Tax Benefits is Reasonably Possible $ 4