Retirement Benefits and Trusteed Assets Retirement Benefits and Trusteed Assets (OPEB - Assumptions Used) (Details) (Other Postretirement Benefit Plans, Defined Benefit [Member])	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]
Defined Benefit Plan, 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%
Defined Benefit Plan Health Care Trend Rate Pre and Post Sixty Five	7.00%	7.00%	7.00%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate		5.00%	5.00%
Defined Benefit Plan Assumptions Used Calculating Other Postretirement Benefit Cost Discount Rate, prior to remeasurement	4.15%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate		5.00%	5.50%
Defined Benefit Plan Assumptions Used Calculating Other Postretirement Benefit Cost Discount Rate, post remeasurement	4.30%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	8.25%	8.25%	8.75%
Accumulated postretirement obligation [Member]
Assumptions Used to Determine Projected Benefit Obligation and Benefit Costs [Line Items]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	4.50%
Other postretirement benefit costs [Member]
Assumptions Used to Determine Projected Benefit Obligation and Benefit Costs [Line Items]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	5.00%