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Income Taxes - Unrecognized tax benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes    
Balance at beginning of period $ 22 $ 30
Additions for tax positions related to prior years 33  
Reductions related to a lapse in the statute of limitations (9) (8)
Balance at end of period 46 22
Unrecognized tax benefit that, if recognized, could affect the effective tax rate in future periods 36  
Remaining unrecognized tax benefits 10  
Unrecognized tax benefit, income tax receivable 9  
Unrecognized tax foreign, benefit that would be created as part of Canada and US process 1  
Interest expense accrued, net of interest income 4 $ 2
Amount of unrecognized tax benefits that may be recognized within 12 12  
Unrecognized tax benefits that, if recognized, would affect the effective tax rate $ 3