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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 18, 2014
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Examination [Line Items]          
Effective income tax rate reconciliation, percent   23.70% 29.30% 24.10% 28.70%
Discrete tax expense (benefit)   $ (37)      
Effective income tax rate reconciliation, tax credit, foreign, amount   22      
Effective income tax rate reconciliation, share-based compensation, excess tax benefit, amount       $ 6 $ 32
Potential decrease in unrecognized tax benefits   $ 30   $ 30  
Internal Revenue Service (IRS) | Tax Year 2006          
Income Tax Examination [Line Items]          
IRS Notice of Deficiency tax assessment $ 70