Commitments And Contingent Liabilities (Regulatory Proceedings) (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	12 Months Ended
	May 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loss Contingencies [Line Items]
SOCA payments term	15 years
Costs recognized in Operation and Maintenance Expense		$ 2,632	$ 2,481	$ 2,504
PSE&G [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program		153
Aggregate notional amount of MW capacity	1,300	2,000
Percentage of installed capacity under LCAPP PSE&G will be serving		52.00%
Number of installed capacity under LCAPP PSE&G will be serving		676
Costs recognized in Operation and Maintenance Expense		1,508	1,372	1,442
PSE&G [Member] | New Jersey Clean Energy Program [Member]
Loss Contingencies [Line Items]
Aggregate funding for New Jersey Clean Energy Program		195
PSE&G [Member] | Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Costs recognized in Operation and Maintenance Expense		40
Costs incurred to restore service		295
Costs incurred to repair infrastructure		5
Cost recorded as Property, Plant and Equipment		75
Costs recorded as Regulatory Asset		180
Proceeds from insurance recoveries		6
Power [Member]
Loss Contingencies [Line Items]
Costs recognized in Operation and Maintenance Expense		1,122	1,102	1,046
Power [Member] | Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Costs recognized in Operation and Maintenance Expense		85
Pending future recovery of insurance proceeds		19
PSEG [Member] | Superstorm Sandy [Member]
Loss Contingencies [Line Items]
Proceeds from insurance recoveries		$ 25