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Income Taxes - Deferred Tax Valuation Allowance (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred tax valuation allowance, rollfoward      
Balance at beginning of year $ 94    
Balance at end of year 83 $ 94  
Deferred tax asset valuation allowance      
Deferred tax valuation allowance, rollfoward      
Balance at beginning of year 94 90 $ 75
Charged to Income tax expense (11) 4 15
Balance at end of year $ 83 $ 94 $ 90