Income Taxes (Schedule Of Effective Tax Rates) (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Taxes [Line Items]
Effective tax rate	36.50%	39.40%	36.30%	38.80%
PSE And G [Member]
Income Taxes [Line Items]
Effective tax rate	36.10%	38.20%	36.10%	38.70%
Power [Member]
Income Taxes [Line Items]
Effective tax rate	39.30%	40.30%	39.40%	38.60%