Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	$ 134	$ 116	$ 226
Cash payments	(57)	(54)	(108)
Restructuring charges	60	130	96
Other	(26)	(58)	(98)
Restructuring reserve ending balance	111	134	116
Layoff Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	77	53	160
Cash payments	(44)	(45)	(93)
Restructuring charges	47	93	43
Other	(21)	(24)	(57)
Restructuring reserve ending balance	59	77	53
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	57	63	66
Cash payments	(13)	(9)	(15)
Restructuring charges	13	37	53
Other	(5)	(34)	(41)
Restructuring reserve ending balance	$ 52	$ 57	$ 63