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Retirement Benefits (Schedule Of Accumulated And Projected Benefit Obligations) (Details) - Pension Plan [Member] - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]      
Pension PBO $ 2,403 $ 2,547 $ 2,073
Pension ABO 2,140 2,257  
Fair value of Pension Plan assets $ 2,013 $ 1,979 $ 1,964