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Commitments And Contingent Liabilities (Environmental Matters) (Detail)
1 Months Ended 3 Months Ended
Jun. 30, 2008
USD ($)
Mar. 31, 2016
USD ($)
Potentially_Responsible_Party
entity
site
Station
Plant
mi
Dec. 31, 2015
USD ($)
Mar. 31, 2007
Potentially_Responsible_Party
Dec. 31, 2006
Dec. 31, 2003
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 | mi   17        
Number of miles on Passaic River tidal reach required to be studied as determined by the US Environmental Protection Agency | mi   8        
Number of additional legal entities contacted by EPA in conjunction with Newark Bay study area contamination | entity   11        
Number of operating electric generating stations located on Hackensack River | Station   2        
Number of former MGP contamination sites located on Hackensack river in conjunction with Newark Bay study area contamination | site   1        
Accrued environmental costs   $ 423,000,000 $ 415,000,000      
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   $ 354,000,000 $ 365,000,000      
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 | Potentially_Responsible_Party   53   73    
Estimated, total cost of the study   $ 156,000,000        
Total Spend of Study to date   146,000,000        
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 EPA Preferred Method   2,300,000,000        
Accrual for Environmental Loss Contingencies   57,000,000        
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        
Number Of Additional Potentially Responsible Parties Directed By New Jersey Department Of Environmental Protection To Arrange Damage Assessment For Lower Passaic River | Potentially_Responsible_Party           56
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 | Plant   1        
Number of former Manufactured Gas Plant (MGP) sites | Plant   4        
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)   $ 36,000,000        
Accrual for Environmental Loss Contingencies   46,000,000        
CPG Targeted Method Cleanup Costs Low Estimate   10,000,000        
Passaic River Site Contingency [Member] | Power [Member]            
Site Contingency [Line Items]            
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)   8,000,000        
Accrual for Environmental Loss Contingencies   11,000,000        
CPG Targeted Method Cleanup Costs Low Estimate   3,000,000        
Mgp Remediation Site Contingency [Member] | PSE And G [Member]            
Site Contingency [Line Items]            
Accrued environmental costs   434,000,000        
Estimated Expenditures Low End Of Range   434,000,000        
Estimated Expenditures High End Of Range   500,000,000        
Remediation Liability Recorded As Other Current Liabilities   90,000,000        
Remediation Liability Recorded As Other Noncurrent Liabilities   344,000,000        
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%