Pension Plans, Postretirement and Other Employee Benefits (Details 1) (United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member], USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member]
Postretirement Costs
Service cost-benefits earned during the period		$ 1		$ 1
Interest cost	2	2	4	4
Net amortization:
Actuarial loss	1	1	2	2
Prior service cost (credit)	(2)	(2)	(3)	(3)
Net pension and postretirement costs	$ 1	$ 2	$ 3	$ 4