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Income Taxes - Unrecognized tax benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Taxes    
Balance at beginning of period $ 39 $ 86
Reductions for tax positions related to prior years (2)  
Additions based on tax positions related to the current year   12
Settlements   (58)
Reductions related to a lapse in the statute of limitations (7) (1)
Balance at end of period 30 39
Unrecognized tax benefit that, if recognized, could affect the effective tax rate in future periods 10  
Remaining unrecognized tax benefits 20  
Unrecognized tax benefit, income tax receivable 19  
Unrecognized tax foreign benefit that would be created as part of Canada and US process 1  
Interest expense accrued, net of interest income 2 $ 2
Amount of unrecognized tax benefits that may be recognized within 12 8  
Unrecognized tax benefits that, if recognized, would affect the effective tax rate $ 4