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Pension And Other Postretirement Benefits (Weighted Average Assumptions Used To Determine Net Periodic Benefit Costs) (Detail)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Expected long-term return on plan assets	7.25%	7.75%
Pension Benefits [Member]
Discount rate	5.00%	5.65%	6.40%
Expected long-term return on plan assets	7.25%	7.75%	8.00%
Rate of compensation increase	5.00%	5.00%	5.00%
Other Postretirement Benefits [Member]
Discount rate	4.90%	5.60%	6.30%
Expected long-term return on plan assets	7.25%	7.75%	8.00%
Rate of compensation increase	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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