Restructuring and Other Charges - Activity and Reserve Balances for Restructuring Charges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012		Sep. 30, 2011	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance			$ 134		$ 116	$ 116
Cash payments			(39)			(54)
Restructuring charges	2	9	27		49	130
Other			(7)	[1]		(58)	[1]
Restructuring reserve ending balance	110		110			134
Layoff Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance			77		53	53
Cash payments			(31)			(45)
Restructuring charges			20		31	93
Other			(6)	[1]		(24)	[1]
Restructuring reserve ending balance	60		60			77
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance			57		63	63
Cash payments			(8)			(9)
Restructuring charges			2			37
Other			(1)	[1]		(34)	[1]
Restructuring reserve ending balance	$ 50		$ 50			$ 57

[1] Other includes reversals of previously recorded restructuring charges and the effects of foreign currency translation.