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Basis Of Presentation Defined Benefit Pension Plan (Details) - Pension Plan, Defined Benefit [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Defined Benefit Plan Disclosure [Line Items]        
Interest cost and amortization of actuarial loss $ 2 $ 2 $ 6 $ 6
Expected return on plan assets 2 2 6 6
Maximum [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic pension cost $ 1 $ (1) $ 1 $ (1)