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Financial Risk Management Activities (Schedule Of Gross Volume, On Absolute Basis For Derivative Contracts) (Detail)
Jun. 30, 2013
Dec. 31, 2012
Natural Gas Dth [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 495,000,000 596,000,000
Electricity MWh [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 233,000,000 208,000,000
Capacity MW Days [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 4,000,000 4,000,000
FTRs MWh [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 30,000,000 19,000,000
Interest Rate Swaps [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 850,000,000 850,000,000
Oil Gallons [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 1,000,000  
Coal Tons [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis   1,000,000
PSEG [Member] | Natural Gas Dth [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 0 0
PSEG [Member] | Electricity MWh [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 0  
PSEG [Member] | Capacity MW Days [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 0  
PSEG [Member] | FTRs MWh [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 0 0
PSEG [Member] | Interest Rate Swaps [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 850,000,000 850,000,000
PSEG [Member] | Coal Tons [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis   0
Power [Member] | Natural Gas Dth [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 325,000,000 404,000,000
Power [Member] | Electricity MWh [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 233,000,000 208,000,000
Power [Member] | Capacity MW Days [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 0 0
Power [Member] | FTRs MWh [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 30,000,000 19,000,000
Power [Member] | Interest Rate Swaps [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 0 0
Power [Member] | Oil Gallons [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 1,000,000  
Power [Member] | Coal Tons [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis   1,000,000
PSE And G [Member] | Natural Gas Dth [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 170,000,000 192,000,000
PSE And G [Member] | Electricity MWh [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 0 0
PSE And G [Member] | Capacity MW Days [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 4,000,000 4,000,000
PSE And G [Member] | FTRs MWh [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 0 0
PSE And G [Member] | Interest Rate Swaps [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 0  
PSE And G [Member] | Oil Gallons [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis 0  
PSE And G [Member] | Coal Tons [Member]
   
Derivative [Line Items]    
Gross volume of derivative on absolute value basis   0