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Pension and Other Postretirement Benefits (Details 1) (Postretirement benefits [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Postretirement benefits [Member]
Components of pension expense for the defined benefit pension plan
Interest cost	$ 1	$ 1	$ 2	$ 2
Amortization of transition obligation			1	1
Net periodic cost	$ 1	$ 1	$ 3	$ 3

- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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