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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Income Tax Examination [Line Items]          
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount $ 24        
Income tax expense $ 66 $ 31 $ 208 $ 88  
Effective tax rate 23.00% 9.00% 20.00% 10.00%  
Income Tax Expense (Benefit) associated with discrete items $ 28 $ (11) $ 48 $ (23)  
Cash taxes paid     205 $ 171  
UNITED STATES          
Income Tax Examination [Line Items]          
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount     $ 25   $ 50