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Derivative Financial Instruments (Effect of Deriative Instruments on Income Statement and Statement of Comprehensive Income) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Financial Instruments    
Amount of gain (loss) recognized in OCI $ 9 $ 0
Amount of gain reclassified from OCI into revenue (1,237) (1,217)
Reclassification out of Accumulated Other Comprehensive Income | Foreign Exchange Contract    
Derivative Financial Instruments    
Amount of gain reclassified from OCI into revenue [1] 1 (1)
Amount of (gain) loss reclassified from OCI into cost of revenue [1] 1 0
Cash Flow Hedging [Member] | Foreign Exchange Contract    
Derivative Financial Instruments    
Amount of gain (loss) recognized in OCI [1] (9) 0
Cash Flow Hedging [Member] | Cross Currency Swaps    
Derivative Financial Instruments    
Amount of gain (loss) recognized in OCI [1] 7 (23)
Cash Flow Hedging [Member] | Foreign Currency Denominated Debt    
Derivative Financial Instruments    
Amount of gain (loss) recognized in OCI [1] 7 (23)
Interest Expense | Cross Currency Swaps    
Derivative Financial Instruments    
Amount of gain (loss) recognized in OCI $ 3 $ 0
[1] Effective portion