Derivative Instruments and Hedging Activities - Effect of Derivative Instruments in Cash Flow Hedging Relationships on Income and Accumulated Other Comprehensive Loss (AOCL) (Detail) (Foreign exchange contracts, USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Foreign exchange contracts
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in OCL	$ 76	$ 142	$ (27)	$ (35)