Restructuring and Other Charges - Schedule of Restructuring and Other Charges (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring And Related Activities [Abstract]
Resolution of a legal matter	$ 391	$ 85
Layoff costs	201	47	93
Asset impairments	116	40	150
Other	82	21	61
Reversals of previously recorded layoff and other exit costs	(8)	(21)	(23)
Restructuring and other charges	$ 782	$ 172	$ 281