Commitments And Contingent Liabilities (Environmental Matters) (Detail) (USD $)	12 Months Ended			1 Months Ended
	Dec. 31, 2014 entity site Station mi	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2008	Dec. 31, 2006	Mar. 31, 2007 Potentially_Responsible_Party	Dec. 31, 2003 Potentially_Responsible_Party
Site Contingency [Line Items]
Percentage of residential gas supply permitted to be recovered in gas hedging by BPU	80.00%
Number of miles related to the Passaic River constituting a facility as determined by the US Environmental Protection Agency	17
Number Of Miles Pertaining To Passaic River Tidal Reach Required To Be Studied By Epa	8
Number of legal entities contacted by EPA in conjunction with Newark Bay study area contamination	11
Number of operating electric generating stations located on Hackensack River	2
Number of former MGP contamination sites located on Hackensack river in conjunction with Newark Bay study area contamination	1
Accrued environmental costs	$ 417,000,000	$ 414,000,000
New Salem facility cooling towers estimated cost total	1,000,000,000
Operation and Maintenance	3,150,000,000	2,887,000,000	2,632,000,000
PSE&G [Member]
Site Contingency [Line Items]
Percentage Of Cost Attributable To Potentially Responsible Party						7.00%
Accrued environmental costs	364,000,000	363,000,000
Regulatory assets	3,764,000,000	3,331,000,000
Operation and Maintenance	1,558,000,000	1,639,000,000	1,508,000,000
Power [Member]
Site Contingency [Line Items]
Ownership Percentage Of Keystone Coal Fired Plant In Pennsylvania	23.00%
New Salem facility cooling towers estimated cost total	575,000,000
Operation and Maintenance	1,186,000,000	1,224,000,000	1,127,000,000
PSEG [Member]
Site Contingency [Line Items]
Parent companies share of investment in Clean Air Act requirements				110,000,000
New Jersey Clean Energy Program Unfavorable Regulatory Action [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	345,000,000
New Jersey Clean Energy Program Unfavorable Regulatory Action [Member] | PSE&G [Member]
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss	200,000,000
Discounted liability recorded-current	142,000,000
PSD NSR Regulations Site Contingency [Member] | Power [Member]
Site Contingency [Line Items]
Penalty per day from date of violation-minimum	25,000
Penalty per day from date of violation-maximum	37,500
MGP Remediation Site Contingency [Member] | PSE&G [Member]
Site Contingency [Line Items]
Estimated expenditures, low end of range	434,000,000
Estimated expenditures, high end of range	505,000,000
Accrued environmental costs	434,000,000
Remediation liability recorded as other current liabilities	79,000,000
Remediation liability recorded as environmental costs in noncurrent liabilities	355,000,000
Regulatory assets	434,000,000
Remedial Investigation And Feasibility Study [Member]
Site Contingency [Line Items]
Estimated, total cost of the study	30,000,000
Estimated Total Cost Of Study Low End of Range	25,000,000
Passaic River mile 10.9 contaminant removal [Member]
Site Contingency [Line Items]
Percentage Of Cost Attributable To Potentially Responsible Party	3.00%
PSE&G's Former MGP Sites [Member]
Site Contingency [Line Items]
Estimated, total cost of the study	136,000,000
Number Of Potentially Responsible Parties In Connection With Environmental Liabilities For Operations Conducted Near Passaic River	61						73
Number of MGP sites identified by registrant and the NJDEP requiring some level of remedial action	38
Total Spend of Study to date	130,000,000
Company Share of Total Spend of Study to date	9,000,000
PSE&G's Former MGP Sites [Member] | Power [Member]
Site Contingency [Line Items]
Percentage Of Cost Attributable To Potentially Responsible Party						1.00%
Passaic River Site Contingency [Member]
Site Contingency [Line Items]
Estimated cleanup costs-low estimate	365,000,000
Estimated cleanup costs-high estimate	3,250,000,000
Estimated Cleanup Costs EPA Preferred Method	1,700,000,000
Estimated cleanup costs agreed to by two potentially responsible parties					80,000,000
Aggregate number of PRPs directed by the NJDEP to arrange for natural resource damage assessment and interim compensatory restoration along the lower Passaic River								56
Estimated cost of interim natural resource injury restoration	$ 950,000,000
Passaic River Site Contingency [Member] | Transferred To Power From PSE&G [Member]
Site Contingency [Line Items]
Number of operating electric generating station (Essex Site)	1
Passaic River Site Contingency [Member] | PSE&G [Member]
Site Contingency [Line Items]
Number of former generating electric station	1
Number of former Manufactured Gas Plant (MGP) sites	4