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Income Taxes Accounting for Uncertainty in Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Unrecognized Tax Benefits $ 17 $ 19 $ 20
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 16    
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 1    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns      
Unrecognized Tax Benefits, Beginning of Period 19 20 20
Gross increases—tax positions in prior periods     1
Reduction due to lapse of statute of limitations (1) (1) (1)
Settlements (1)    
Unrecognized Tax Benefits, End of Period $ 17 $ 19 $ 20