Income Taxes (Schedule Of Effective Tax Rates) (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Taxes [Line Items]
Effective tax rate	22.10%	38.90%	25.10%	35.50%
PSE And G [Member]
Income Taxes [Line Items]
Effective tax rate	25.50%	38.80%	26.10%	37.40%
Power [Member]
Income Taxes [Line Items]
Effective tax rate	16.70%	41.90%	24.10%	37.90%