Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended	12 Months Ended
	May 31, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 New Jersey Clean Energy Program Unfavorable Regulatory Action [Member]	Jun. 30, 2013 PSE And G [Member] MW	Jun. 30, 2012 PSE And G [Member]	Jun. 30, 2013 PSE And G [Member] MW	Jun. 30, 2012 PSE And G [Member]	Dec. 31, 2012 PSE And G [Member] MW	Jun. 30, 2013 PSE And G [Member] New Jersey Clean Energy Program Unfavorable Regulatory Action [Member]	Jun. 30, 2013 Power [Member]	Jun. 30, 2012 Power [Member]	Jun. 30, 2013 Power [Member]	Jun. 30, 2012 Power [Member]	Jun. 30, 2013 Power [Member] Superstorm Sandy [Member]	Jun. 30, 2013 Power [Member] Superstorm Sandy [Member]	Dec. 31, 2012 Power [Member] Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program						$ 345						$ 200
Discounted liability recorded-current												204
Loss Contingency, Accrual Carrying Value, Noncurrent												27
Aggregate notional amount of MW capacity							2,000		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		646	629	1,356	1,257		369	350	796	726			280	284	562	525	22	50	85
Proceeds from Insurance Recoveries																		25	19
Utilities, Operating Expenses, Estimated Future Costs																		$ 364