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Fair Value Measurements (Changes In Level 3 Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Settlements $ (20) $ 51  
Net Assets Measured At Fair Value On A Recurring Basis 2,500 2,500  
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3 13 37  
Power [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Gains and losses attributable to changes in net derivative assets and liabilities, included in Operating Income 20 (31)  
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized   22  
Derivative [Member] | Power [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net   (3)  
Net Derivative Assets (Liabilities) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   37 $ 88
Opening Balance 37    
Included in Income [1] (20) 31  
Included in Regulatory Assets/Liabilities [2] (24) (68)  
Purchases, (Sales) 0 0  
Issuances (Settlements) [3] 20 (51)  
Transfers In (Out) [4] 0 3  
Closing Balance 13 37  
Net Derivative Assets (Liabilities) [Member] | Power [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   11 (6)
Opening Balance 11    
Included in Income [1] (20) 31  
Included in Regulatory Assets/Liabilities [2] 0 0  
Purchases, (Sales) 0 0  
Issuances (Settlements) [3] 20 (51)  
Transfers In (Out) [4] 0 3  
Closing Balance 11 11  
Net Derivative Assets (Liabilities) [Member] | PSE&G [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs   26 $ 94
Opening Balance 26    
Included in Income [1] 0 0  
Included in Regulatory Assets/Liabilities [2] (24) (68)  
Purchases, (Sales) 0 0  
Issuances (Settlements) [3] 0 0  
Transfers In (Out) [4] 0 0  
Closing Balance $ 2 $ 26  
[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $20 million and $(31) million in Operating Income in 2015 and 2014, respectively. The $20 million in Operating Income in 2015 is realized. Of the $(31) million in Operating Income in 2014, $22 million is unrealized.
[2] Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or Accumulated Other Comprehensive Income (Loss), as they are deferred as a Regulatory Asset/Liability and are expected to be recovered from/returned to PSE&G’s customers.
[3] Represents $(20) million and $51 million in settlements for derivative contracts in 2015 and 2014, respectively.
[4] During the year ended December 31, 2014, $(3) million of net derivatives assets/liabilities were transferred from Level 3 to Level 2 due to more observable pricing for the underlying securities. The transfers were recognized as of the beginning of the quarters (i.e. the quarter in which the transfers occurred), as per PSEG’s policy.