Commitments And Contingent Liabilities (Environmental Matters) (Detail) (USD $)	3 Months Ended	1 Months Ended
	Mar. 31, 2015 Potentially_Responsible_Party site	Jun. 30, 2008	Dec. 31, 2014	Dec. 31, 2006	Mar. 31, 2007 Potentially_Responsible_Party
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 additional 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	$ 427,000,000		$ 417,000,000
New Salem facility cooling towers estimated cost total	1,000,000,000
PSE And G [Member]
Site Contingency [Line Items]
Percentage of cost attributable to potentially responsible party				7.00%
Accrued environmental costs	375,000,000		364,000,000
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
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
Pse G S Former Mgp Sites [Member]
Site Contingency [Line Items]
Number of potentially responsible parties ("PRPs") in connection with environmental liabilities for operations conducted near Passaic River	61				73
Estimated, total cost of the study	148,000,000
Total Spend of Study to date	130,000,000
Company Share of Total Spend of Study to date	9,000,000
Number of MGP sites identified by registrant and the NJDEP requiring some level of remedial action	38
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
CPG Estimated Cleanup Costs Low Estimate	518,000,000
CPG Estimated Cleanup Costs High Estimate	3,200,000,000
CPG Targeted Method Cleanup Costs Low Estimate	518,000,000
CPG Targeted Remedy Cleanup Costs High Estimate	772,000,000
Estimated cleanup costs agreed to by two potentially responsible parties		80,000,000
Estimated cost of interim natural resource injury restoration	950,000,000
Passaic River Site Contingency [Member] | PSE And G [Member]
Site Contingency [Line Items]
Number of former generating electric station	1
Number of former Manufactured Gas Plant (MGP) sites	4
CPG Targeted Method Cleanup Costs Low Estimate	10,000,000
Passaic River Site Contingency [Member] | Power [Member]
Site Contingency [Line Items]
CPG Targeted Method Cleanup Costs Low Estimate	3,000,000
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
MGP Remediation Site Contingency [Member] | PSE And G [Member]
Site Contingency [Line Items]
Estimated expenditures, low end of range	452,000,000
Estimated expenditures, high end of range	523,000,000
Accrued environmental costs	452,000,000
Remediation liability recorded as other current liabilities	86,000,000
Remediation liability recorded as environmental costs in noncurrent liabilities	366,000,000
Regulatory assets	$ 452,000,000
Passaic River mile 10.9 contaminant removal [Member]
Site Contingency [Line Items]
Percentage of cost attributable to potentially responsible party	3.00%