Valuation And Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance on January 1	$ 152		$ 122		$ 108
Charged to costs and expenses	262		48		18
Deductions from reserves	(19)		(14)		1
Other adjustments	2	[1]	(4)	[1]	(5)	[1]
Balance on December 31	$ 397		$ 152		$ 122

[1] foreign currency translation adjustments.