Commitments And Contingent Liabilities (Environmental Matters) (Detail) (USD $)								1 Months Ended		9 Months Ended			1 Months Ended					9 Months Ended
	Sep. 30, 2014 entity site Station mi	Dec. 31, 2013	Apr. 30, 2009 MW Turbines	Sep. 30, 2014 PSE And G [Member]	Dec. 31, 2013 PSE And G [Member]	Dec. 31, 2006 PSE And G [Member]	Sep. 30, 2014 Power [Member]	Dec. 31, 2011 PSEG [Member]	Sep. 30, 2014 Psd Nsr Regulations Site Contingency [Member] Power [Member]	Sep. 30, 2014 Pse G S Former Mgp Sites [Member] Potentially_Responsible_Party site	Mar. 31, 2007 Pse G S Former Mgp Sites [Member] Potentially_Responsible_Party	Dec. 31, 2006 Pse G S Former Mgp Sites [Member] Power [Member]	Jun. 30, 2008 Passaic River Site Contingency [Member]	Sep. 30, 2014 Passaic River Site Contingency [Member]	Dec. 31, 2003 Passaic River Site Contingency [Member] Potentially_Responsible_Party	Sep. 30, 2014 Passaic River Site Contingency [Member] PSE And G [Member] Plant	Feb. 28, 2009 Passaic River Site Contingency [Member] Power [Member] Defendant	Sep. 30, 2014 Remedial Investigation And Feasibility Study [Member]	Sep. 30, 2014 MGP Remediation Site Contingency [Member] PSE And G [Member]	Sep. 30, 2014 Passaic River mile 10.9 contaminant removal [Member]
Site Contingency [Line Items]
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	8
Number of former generating electric station																1
Number of former Manufactured Gas Plant (MGP) sites																4
Number of potentially responsible parties ("PRPs") in connection with environmental liabilities for operations conducted near Passaic River										61	73
Percentage of cost attributable to potentially responsible party						7.00%						1.00%								3.00%
Estimated, total cost of the study										$ 136,000,000								$ 30,000,000
Total Spend of Study to date										124,000,000
Company Share of Total Spend of Study to date										9,000,000
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
Estimated Total Cost Of Study Low End of Range																		25,000,000
Aggregate number of defendants including registrant entities Power and PSE&G included in NJDEP complaint filed February 2009																	320
Number of additional legal entities contacted by EPA in conjunction with Newark Bay study area contamination	11
Number of additional 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 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																			452,000,000
Estimated expenditures, high end of range																			524,000,000
Accrued environmental costs	438,000,000	414,000,000		386,000,000	363,000,000														452,000,000
Remediation liability recorded as other current liabilities																			75,000,000
Remediation liability recorded as environmental costs in noncurrent liabilities																			377,000,000
Regulatory assets																			452,000,000
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
New Salem facility cooling towers estimated cost total	$ 1,000,000,000						$ 575,000,000