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Retirement Benefits (Weighted Average Actuarial Assumptions Used To Determine Health Care Benefit Obligations for the Plans) (Details) (Postretirement Health Care Benefits Plan)
Dec. 31, 2014
Dec. 31, 2013
Postretirement Health Care Benefits Plan
   
Defined Benefit Plan Disclosure [Line Items]    
Discount rate for obligations 3.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
4.65%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember