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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