Restructuring Charges (Number of Positions Eliminated Rollfoward) (Details)	3 Months Ended
	Mar. 31, 2013 Employees	Mar. 31, 2012 Employees
Restructuring and Related Cost, Number of Positions Eliminated [Roll Forward]
Planned reductions - January 1	54,000,000	0
Additional planned reductions	99,000,000	0
Actual reductions	(52,000,000)	0
Planned reductions - March 31	101,000,000	0