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Pension and Postretirement Health and Life Benefits (Schedule of Assumptions Used) (Details)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Pension Plans [Member]
Discount rate	4.95%	5.77%	5.84%
Expected return on plan assets	7.25%	7.50%	7.50%
Compensation increases	4.25%	4.25%	4.25%
Postretirement Health and Life Benefits Plans [Member]
Discount rate	4.46%	5.32%	5.44%
Expected return on plan assets	7.25%	7.50%	7.50%
Compensation increases	4.25%	4.25%	4.25%

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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