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Pension And Postretirement Benefit Costs (Weighted Average Assumptions) (Details) (Pension Benefits [Member])	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.50%	5.00%	5.50%
Expected return on plan assets	8.00%	8.00%	8.00%
Rate of compensation increase (Staff plan only)	3.50%	3.50%	4.00%
Discount rate	5.00%	5.50%	6.00%
Rate of compensation increase (Staff plan only)	3.50%	4.00%	4.50%

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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