Commitments And Contingent Liabilities (Environmental Matters) (Detail) (USD $)	1 Months Ended	12 Months Ended				12 Months Ended						1 Months Ended							12 Months Ended		12 Months Ended	1 Months Ended
	May 31, 2012	Dec. 31, 2013 site Station entity mi	Dec. 31, 2012	Dec. 31, 2011 MW	Apr. 30, 2009 Turbines MW	Dec. 31, 2013 PSE&G [Member]	Dec. 31, 2012 PSE&G [Member]	Dec. 31, 2011 PSE&G [Member]	Dec. 31, 2013 Power [Member]	Dec. 31, 2012 Power [Member]	Dec. 31, 2011 Power [Member]	Dec. 31, 2011 PSEG [Member]	Dec. 31, 2006 PSE&G's Former MGP Sites [Member] PSE&G [Member]	Dec. 31, 2006 PSE&G's Former MGP Sites [Member] Power [Member]	Dec. 31, 2013 New Jersey Clean Energy Program Unfavorable Regulatory Action [Member]	Dec. 31, 2013 New Jersey Clean Energy Program Unfavorable Regulatory Action [Member] PSE&G [Member]	Dec. 31, 2013 PSD NSR Regulations Site Contingency [Member] Power [Member]	Dec. 31, 2013 MGP Remediation Site Contingency [Member] PSE&G [Member]	Dec. 31, 2013 Remedial Investigation And Feasibility Study [Member]	Dec. 31, 2013 PSE&G's Former MGP Sites [Member] site	Dec. 31, 2013 PSE&G's Former MGP Sites [Member] PSE&G [Member] Potentially_Responsible_Party Person	Jun. 30, 2008 Passaic River Site Contingency [Member]	Dec. 31, 2013 Passaic River Site Contingency [Member]	Dec. 31, 2003 Passaic River Site Contingency [Member] Potentially_Responsible_Party	Dec. 31, 2013 Passaic River Site Contingency [Member] Transferred To Power From PSE&G [Member] Plant	Dec. 31, 2013 Passaic River Site Contingency [Member] PSE&G [Member] Plant	Feb. 28, 2009 Passaic River Site Contingency [Member] Power [Member] Defendant
Site Contingency [Line Items]
Loss Contingency, Estimate of Possible Loss															$ 345,000,000	$ 200,000,000
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 on Passaic River tidal reach required to be studied as determined by the US Environmental Protection Agency		17
Number of operating electric generating station (Essex Site)																									1
Number of former generating electric station																										1
Number of former Manufactured Gas Plant (MGP) sites																										4
Estimated, total cost of the study																			30,000,000		125,000,000
Aggregate number Of defendants In New Jersey Department Of Environmental Protection complaint																											320
Number of potentially responsible parties ("PRPs") in connection with environmental liabilities for operations conducted near Passaic River																					73
Number of current potentially responsible parties ("PRPs") in connection with environmental liabilities for operations conducted near Passaic River																					67
Percentage of cost attributable to potentially responsible party													7.00%	1.00%
Estimated cleanup costs-low estimate																							1,300,000,000
Estimated cleanup costs-high estimate																							3,700,000,000
Estimated cleanup costs agreed to by two potentially responsible parties																						80,000,000
Estimated Total Cost Of Study Low End of Range																			25,000,000
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
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
Number of MGP sites identified by registrant and the NJDEP requiring some level of remedial action																				38
Estimated expenditures, low end of range																		445,000,000
Estimated expenditures, high end of range																		521,000,000
Accrued environmental costs		414,000,000	537,000,000			363,000,000	486,000,000											445,000,000
Remediation liability recorded as other current liabilities																		92,000,000
Remediation liability recorded as environmental costs in noncurrent liabilities																		353,000,000
Regulatory assets						3,331,000,000	4,892,000,000											445,000,000
Penalty per day from date of violation-minimum																	25,000
Penalty per day from date of violation-maximum																	37,500
Ownership Percentage Of Keystone Coal Fired Plant In Pennsylvania									23.00%
Parent companies share of investment in Clean Air Act requirements												110,000,000
Number of combustion turbines required to be retired to meet NOx emission reduction requirements					86
Number of MW required to be retired to meet NOx emission reduction requirements					1,750
Number of steam electric generation units requiring significant capital investment for additional controls or retirement as determined by NJDEP					4
Number of MW requiring significant capital investment for additional controls or retirement as determined by NJDEP					400
New Salem facility cooling towers estimated cost total		1,000,000,000							575,000,000
Discounted liability recorded-current																142,000,000
New Combined Cycle Generating Facilities To Be Built Under Lcapp				2,000
SOCA payments term	15 years
Operation and Maintenance		$ 2,887,000,000	$ 2,632,000,000	$ 2,481,000,000		$ 1,639,000,000	$ 1,508,000,000	$ 1,372,000,000	$ 1,224,000,000	$ 1,127,000,000	$ 1,105,000,000