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Retirement Benefits and Trusteed Assets (Details 12) (Other Postretirement Benefit Plans, Defined Benefit [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Other Postretirement Benefit Plans, Defined Benefit [Member]
Assumptions Used to Determine Projected Benefit Obligation and Benefit Costs [Line Items]
Discount rate	4.15%	5.00%	5.50%
Discount Rate	5.00%	5.50%	5.90%
Expected long-term rate of return on plan assets	8.25%	8.75%	8.75%
Health care trend rate pre and post 65	7.00%	7.00%	7.00%	7.00%
Ultimate health care trend rate	5.00%	5.00%	5.00%	5.00%

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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