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Retirement Benefits (Schedule Of Pooled Funds Components) (Details)
Dec. 31, 2016
Dec. 31, 2015
DB Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
U.S. equity securities 67.00% 62.00%
Foreign equity securities 16.00% 18.00%
U.S. fixed-income securities 9.00% 11.00%
Foreign fixed-income securities 4.00% 6.00%
Alternative investments 4.00% 3.00%
OPEB [Member]    
Defined Benefit Plan Disclosure [Line Items]    
U.S. equity securities 72.00% 58.00%
Foreign equity securities 13.00% 13.00%
U.S. fixed-income securities 8.00% 22.00%
Foreign fixed-income securities 4.00% 5.00%
Alternative investments 3.00% 2.00%