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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Effective income tax rate reconciliation, percent     35.30% 27.00%
Effective income tax rate reconciliation, including discrete items, percent 37.90% 38.10%    
Discrete income tax benefit $ 36      
Deduction of prior year foreign taxes 25      
Benefit from change in tax rate 12      
Effective income tax rate reconciliation, net charge for a number of small items $ 1      
Discrete charge primarily related to revised estimate of provisional impact of Tax Cut and Jobs Act of 2017   $ 21