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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 Plans)
Dec. 31, 2012
Dec. 31, 2011
Postretirement Health Care Benefits Plans
   
Defined Benefit Plan Disclosure [Line Items]    
Discount rate for obligations 3.80% 4.75%
Investment return assumptions 8.25% 8.25%