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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]    
Unrecognized tax benefits, excluding related interest expense and penalties(a) $ 234 $ 251
Portion that, if recognized, would reduce tax expense and effective tax rate 170 $ 164
Decrease in Unrecognized Tax Benefits is Reasonably Possible 53  
Decrease in Unrecognized Tax Benefits That Would Impact Effective Tax Rate $ 24