Restructuring And Other Charges (Activity And Reserve Balances For Restructuring Charges) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012		Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	$ 134		$ 116
Cash payments	(15)		(54)
Restructuring charges	12		130
Other	(3)	[1]	(58)	[1]
Restructuring reserve ending balance	128		134
Layoff Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	77		53
Cash payments	(13)		(45)
Restructuring charges	11		93
Other	(2)	[1]	(24)	[1]
Restructuring reserve ending balance	73		77
Other Exit Costs [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring reserve beginning balance	57		63
Cash payments	(2)		(9)
Restructuring charges	1		37
Other	(1)	[1]	(34)	[1]
Restructuring reserve ending balance	$ 55		$ 57

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