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Income Taxes Unrecognized Tax Benefits Roll Forward (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]      
Decrease in Unrecognized Tax Benefits is Reasonably Possible $ 10    
Uncertain Tax Positions More Likely Than Not Largest Amount of Benefit Percentage 50.00%    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of period $ 224 $ 180 $ 43
Additions related to current year 33 51 94
Additions related to prior year 65 40 67
Reductions related to prior year (19) (31) (15)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations 78 15 8
Settlements (16) (1) (1)
Balance at end of period 209 224 180
Income Tax Uncertainties [Abstract]      
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 203 159  
Unrecognized Tax Benefits that Would Impact Effective Tax Rate, Write off of Related Deferred Tax Asset 18 85  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued 12 21  
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense (Benefit) (7) $ 5 $ 5
Tax Year 2018 [Member]      
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations $ 60