Retirement Benefits and Trusteed Assets (Pension Plan - Target Allocations of Plan Assets) (Details) - Pension Plan	12 Months Ended
	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Percentage of Assets	100.00%
U.S. Large Capitalization (Cap) Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Percentage of Assets	22.00%
U.S. Small Cap and Mid Cap Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Percentage of Assets	5.00%
Non-U.S. Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Percentage of Assets	20.00%
Fixed Income Securities
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Percentage of Assets	25.00%
Hedge Funds and Similar Investments
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Percentage of Assets	20.00%
Private Equity and Other
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Percentage of Assets	8.00%