Derivative Instruments Derivatives in Accumulated Other Comprehensive Income (Details) (Designated as Hedging Instrument, Foreign Exchange Contract, Cash Flow Hedging, USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Designated as Hedging Instrument | Foreign Exchange Contract | Cash Flow Hedging
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, beginning balance	$ (106)	$ (55)
Amount of gain (loss) recognized in other comprehensive income (effective portion)	147	(23)
Amount of gain (loss) reclassified from other comprehensive income to net revenue and operating expense (effective portion)	(64)	1
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from cash flow hedges, ending balance	$ 105	$ (79)