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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Taxes      
Provision for income taxes $ 471 $ 776 $ 922
Undistributed earnings of foreign subsidiaries expected to be repatriated 102 117  
Undistributed earnings of foreign subsidiaries 8,400    
Income Taxes      
Operating Loss Carryforwards, Valuation Allowance 766    
Income tax loss carryforwards, subject to expiration 473    
Remaining amount of loss carryforwards that has no expiration date 293    
Unrecognized tax benefits that would reduce our effective tax rate if recognized 241    
Total accrued penalties and net accrued interest 20 $ 35  
Aggregate resolution of uncertainties $ 100    
Minimum      
Income Taxes      
Operating Loss Carryforwards, Expiration Date Jan. 01, 2019    
Maximum      
Income Taxes      
Operating Loss Carryforwards, Expiration Date Dec. 31, 2038    
U.S. Tax Cuts and Jobs Act      
Income Taxes      
Net Expense for U.S. Tax Cuts and Jobs Act $ 36    
Provision for income taxes 81    
Undistributed earnings of foreign subsidiaries expected to be repatriated 700    
Undistributed earnings of foreign subsidiaries 5,600    
Undistributed earnings of foreign subsidiaries considered indefinitely reinvested $ 4,900