Restructuring And Other Charges (Restructuring And Other Charges) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Restructuring And Other Charges [Abstract]
Asset impairments	$ 150	$ 139	$ 54
Layoff costs	93	43	186
Other exit costs	61	58	37
Reversals of previously recorded layoff and other exit costs	(23)	(33)	(40)
Restructuring and other charges	$ 281	$ 207	$ 237