Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) (PSE And G [Member], USD $) In Millions, unless otherwise specified	1 Months Ended
	May 31, 2012 MW	Jun. 30, 2012 MW
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program		$ 705
Aggregate notional amount of MW capacity	1,300	2,000
SOCA payments term	15 years
New Jersey Clean Energy Program Unfavorable Regulatory Action [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program		1,200
Discounted liability recorded-current		$ 138