Income Taxes (Schedule Of Effective Tax Rates) (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Effective tax rate	40.50%	40.20%
Power [Member]
Effective tax rate	41.10%	40.40%
PSE And G [Member]
Effective tax rate	39.40%	40.10%