Retirement Benefits and Trusteed Assets (OPEB - Assumptions used in Determining the PBO and Net Pension Costs) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013
Assumptions Used to Determine Projected Benefit Obligation and Benefit Costs [Line Items]
Health care trend rate pre and post 65			7.00%
Ultimate health care trend rate			5.00%
Other Postretirement Benefit Plan, Defined Benefit [Member]
Assumptions Used to Determine Projected Benefit Obligation and Benefit Costs [Line Items]
Assumptions Used Calculating Benefit Obligation, Discount Rate	4.95%	4.15%	5.00%	4.30%
Defined Benefit Plan Health Care Trend Rate Pre Sixty Five	7.50%
Defined Benefit Plan Health Care Trend Rate Post Sixty Five	6.50%
Health care trend rate pre and post 65	7.00%	7.00%	7.00%
Ultimate health care trend rate		5.00%	5.00%
Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	4.15%
Defined Benefit Plan Assumptions Used Calculating Other Postretirement Benefit Cost Discount Rate		5.00%	5.50%
Defined Benefit Plan Assumptions Used Calculating Other Postretirement Benefit Cost Discount Rate, post remeasurement	4.30%
Expected long-term rate of return on plan assets	8.25%	8.25%	8.75%
Accumulated postretirement benefit obligation [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]
Assumptions Used to Determine Projected Benefit Obligation and Benefit Costs [Line Items]
Ultimate health care trend rate	4.50%
Other postretirement benefit costs [Member] | Other Postretirement Benefit Plan, Defined Benefit [Member]
Assumptions Used to Determine Projected Benefit Obligation and Benefit Costs [Line Items]
Ultimate health care trend rate	5.00%