Derivative Instruments and Hedging Activities - Effect of Derivative Instruments in Cash Flow Hedging Relationships on Income and Other Comprehensive Loss (OCI) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Foreign exchange contracts	Sep. 30, 2012 Foreign exchange contracts	Sep. 30, 2013 Foreign exchange contracts	Sep. 30, 2012 Foreign exchange contracts	Sep. 30, 2013 Foreign exchange contracts Cost of revenue	Sep. 30, 2012 Foreign exchange contracts Cost of revenue	Sep. 30, 2013 Foreign exchange contracts Cost of revenue	Sep. 30, 2012 Foreign exchange contracts Cost of revenue	Sep. 30, 2013 Foreign exchange contracts Research & engineering	Sep. 30, 2012 Foreign exchange contracts Research & engineering	Sep. 30, 2013 Foreign exchange contracts Research & engineering	Sep. 30, 2012 Foreign exchange contracts Research & engineering
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from Accumulated OCL into Income	$ 86	$ 66	$ 30	$ 92	$ (15)	$ (58)	$ 33	$ 97	$ (8)	$ (48)	$ (3)	$ (5)	$ (7)	$ (10)