Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended				3 Months Ended		9 Months Ended		12 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	May 31, 2012	Sep. 30, 2013 MW	Sep. 30, 2012	Sep. 30, 2013 MW	Sep. 30, 2012	Dec. 31, 2011 MW	Sep. 30, 2013 New Jersey Clean Energy Program Unfavorable Regulatory Action [Member]	Sep. 30, 2013 PSE And G [Member]	Sep. 30, 2012 PSE And G [Member]	Sep. 30, 2013 PSE And G [Member]	Sep. 30, 2012 PSE And G [Member]	Dec. 31, 2012 PSE And G [Member] MW	Sep. 30, 2013 PSE And G [Member] New Jersey Clean Energy Program Unfavorable Regulatory Action [Member]	Sep. 30, 2013 Power [Member]	Sep. 30, 2012 Power [Member]	Sep. 30, 2013 Power [Member]	Sep. 30, 2012 Power [Member]	Sep. 30, 2013 Power [Member] Superstorm Sandy [Member]	Sep. 30, 2013 Power [Member] Superstorm Sandy [Member]	Dec. 31, 2012 Power [Member] Superstorm Sandy [Member]	Sep. 30, 2013 SOCA Contract commencing in 2015/2016 Delivery Year [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program							$ 345						$ 200
Discounted liability recorded-current													185
Number of Generators selected under LCAPP						3															1
Aggregate notional amount of MW capacity		1,300		1,300		2,000
SOCA payments term	15 years
Percentage of Installed Capacity Under LCAPP Subsidiary Will Be Serving												52.00%
Number of Installed Capacity Under LCAPP Subsidiary Will Be Serving												676
Operation and Maintenance		713	619	2,069	1,876			408	366	1,204	1,092			304	255	866	780	17	67	85
Proceeds from Insurance Recoveries																			25	19
Total Costs to Restore to pre-Storm conditions																			$ 364