Commitments And Contingent Liabilities (Regulatory Proceedings and Superstorm Sandy) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 New Jersey Clean Energy Program Unfavorable Regulatory Action [Member]	Sep. 30, 2014 PSE And G [Member]	Sep. 30, 2013 PSE And G [Member]	Sep. 30, 2014 PSE And G [Member]	Sep. 30, 2013 PSE And G [Member]	Sep. 30, 2014 PSE And G [Member] New Jersey Clean Energy Program Unfavorable Regulatory Action [Member]	Sep. 30, 2014 Power [Member]	Sep. 30, 2013 Power [Member]	Sep. 30, 2014 Power [Member]	Sep. 30, 2013 Power [Member]	Mar. 31, 2014 Power [Member] FERC Compliance [Domain]	Sep. 30, 2014 Power [Member] Superstorm Sandy [Member]	Sep. 30, 2014 Power [Member] Superstorm Sandy [Member]	Dec. 31, 2013 Power [Member] Superstorm Sandy [Member]	Dec. 31, 2012 Power [Member] Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Loss Contingency related to bidding errors															$ 25
Aggregate funding for New Jersey Clean Energy Program					345					200
Discounted liability recorded-current										185
Operation and Maintenance	714	713	2,370	2,069		366	408	1,190	1,204		242	305	871	868		4	23	79	85
Proceeds from Insurance Recoveries																		25	19
Estimate of Total Costs required to restore damaged facilities	$ 579	$ 426	$ 579	$ 426		$ 95	$ 62	$ 95	$ 62		$ 484	$ 364	$ 484	$ 364