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Commitments And Contingent Liabilities (Regulatory Proceedings and Superstorm Sandy) (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended 30 Months Ended 39 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]                      
Clean Energy Program, current portion $ 185       $ 185           $ 142
Operation and Maintenance 746     $ 714 2,170 $ 2,370          
Insurance Recovery         28            
New Jersey Clean Energy Program Regulatory Action [Member]                      
Loss Contingencies [Line Items]                      
Aggregate funding level for fiscal year 2016 for New Jersey Clean Energy Program 345       345            
Superstorm Sandy [Member]                      
Loss Contingencies [Line Items]                      
Proceeds from Insurance Recoveries   $ 55 $ 159   214       $ 264    
PSE And G [Member]                      
Loss Contingencies [Line Items]                      
Clean Energy Program, current portion 185       185           $ 142
Operation and Maintenance 391     366 1,171 1,190          
Insurance Recovery         0            
PSE And G [Member] | New Jersey Clean Energy Program Regulatory Action [Member]                      
Loss Contingencies [Line Items]                      
Aggregate funding level for fiscal year 2016 for New Jersey Clean Energy Program 200       200            
Clean Energy Program, current portion 185       185            
PSE And G [Member] | Superstorm Sandy [Member]                      
Loss Contingencies [Line Items]                      
Utilities, Costs Incurred to Repair Infrastructure to Pre-Storm Conditions               $ 5      
Utilities, Costs Incurred to Restore Service portion attributable to insured property               36      
Utilities, Costs Incurred to Restore Service               295      
Operation and Maintenance         (10)     40      
Proceeds from Insurance Recoveries         35     6      
Public Utilities, Property, Plant and Equipment, Addition from Service Restore         11     (75)      
Regulatory Assets, Addition for Service Restore         20     $ (180)      
Power [Member]                      
Loss Contingencies [Line Items]                      
Operation and Maintenance $ 263     $ 242 748 871          
Insurance Recovery         28            
Power [Member] | FERC Compliance [Domain]                      
Loss Contingencies [Line Items]                      
Loss Contingency related to bidding errors           $ 25          
Power [Member] | Superstorm Sandy [Member]                      
Loss Contingencies [Line Items]                      
Operation and Maintenance         2         $ 193  
Proceeds from Insurance Recoveries         179   $ 44        
Insurance Recovery         145            
Property, Plant and Equipment [Member] | Power [Member] | Superstorm Sandy [Member]                      
Loss Contingencies [Line Items]                      
Insurance Recovery         6            
Other Income [Member]                      
Loss Contingencies [Line Items]                      
Insurance Recovery         $ 28