Employee Postretirement Benefits (Defined Contribution Pension Plans) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Costs charged to expense for defined contribution pension plans	$ 113	$ 98	$ 92
United States Pension Plans of US Entity, Defined Benefit [Member]
Costs charged to expense for defined contribution pension plans	77	75	73
Outside the U.S. [Member]
Costs charged to expense for defined contribution pension plans	$ 36	$ 23	$ 19