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Income Taxes - Deferred Tax Valuation Allowance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deferred tax valuation allowance, rollfoward      
Balance at beginning of year $ 149    
Balance at end of year 177 $ 149  
Deferred tax asset valuation allowance      
Deferred tax valuation allowance, rollfoward      
Balance at beginning of year 149 158 $ 152
Charged to Income tax expense 28 (9) 6
Balance at end of year $ 177 $ 149 $ 158