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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