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Income Taxes - Unrecognized tax benefits (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Taxes    
Balance at beginning of period $ 30 $ 39
Reductions for tax positions related to prior years   (2)
Reductions related to a lapse in the statute of limitations (8) (7)
Balance at end of period 22 30
Unrecognized tax benefit that, if recognized, could affect the effective tax rate in future periods 5  
Remaining unrecognized tax benefits 17  
Unrecognized tax benefit, income tax receivable 15  
Unrecognized tax foreign, benefit that would be created as part of Canada and US process 1  
Unrecognized tax benefit, foreign tax credit 1  
Interest expense accrued, net of interest income 2 $ 2
Amount of unrecognized tax benefits that may be recognized within 12 9  
Unrecognized tax benefits that, if recognized, would affect the effective tax rate $ 2