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Income Taxes - Unrecognized tax benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Taxes    
Balance at beginning of period $ 46 $ 22
Additions for tax positions related to prior years 2 33
Reductions for tax positions related to prior years (9)  
Additions based on tax positions related to the current year 2  
Reductions related to a lapse in the statute of limitations (12) (9)
Balance at end of period 29 $ 46
Unrecognized tax benefit that, if recognized, could affect the effective tax rate in future periods 18  
Remaining unrecognized tax benefits 11  
Unrecognized tax benefits, accrued interest expense and penalties 3  
Amount of unrecognized tax benefits that may be recognized within 12 0  
Unrecognized tax benefits, current $ 0