Derivative Instruments - Effect of Derivative Contracts on Accumulated Other Comprehensive Income (Details) - Designated as Hedging Instrument - Cash Flow Hedging - Foreign Exchange Contract - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Effect of Derivative Contracts on Accumulated Other Comprehensive Income:
Accumulated OCI - Foreign exchange contracts designated as cash flow hedges, beginning of period	$ 41	$ (15)
Amount of gain (loss) recognized in other comprehensive income (effective portion)	66	56
Amount of gain (loss) reclassified from accumulated other comprehensive income to cost of net revenue and operating expense (effective portion)	71	0
Accumulated OCI - Foreign exchange contracts designated as cash flow hedges, end of period	$ 36	$ 41