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Income Taxes - U.S.-Canada treaty (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Income taxes          
Net tax impact of US / Canada settlement $ 24   $ 10    
Net tax impact of US / Canada settlement (as a percent)   0.30% (1.30%) 3.20%  
Settlement of claims with Canadian tax authority   $ 42     $ 63
Interest and penalties through tax expense   $ 2      
Tax impact of change in Mexican Pesos to US Dollars     $ 4 $ 18  
Tax impact of change in Mexican Pesos to US Dollars, percentage points     0.50% 2.40%  
Pre-tax gain on foreign currency exchange amounts     $ 0 $ 0  
2014-2016          
Income taxes          
Net tax impact of US / Canada settlement       $ 7  
Net tax impact of US / Canada settlement (as a percent)       1.00%  
2016          
Income taxes          
Net tax impact of US / Canada settlement income tax expense 70        
Net tax impact of US / Canada settlement income tax benefit $ 46        
Net tax impact of US / Canada settlement (as a percent) 3.20%