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Savings Plans, Pension Plans and Other Postretirement Employee Benefits (Weighted Average Asset Allocations of the Pension Benefit Plans' Assets) (Details) - Pension Plans, Defined Benefit [Member]
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Actual Plan Asset Allocations 100.00% 100.00%
Domestic Equity Securities [Member]    
Defined Benefit Plan, Actual Plan Asset Allocations 35.00% 36.00%
Fixed income [Member]    
Defined Benefit Plan, Actual Plan Asset Allocations 48.00% 48.00%
Other notes [Member]    
Defined Benefit Plan, Actual Plan Asset Allocations 17.00% 16.00%