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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, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2011
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     $ (17)    
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized     (8) (2)  
Settlements   (14) 10 (43)  
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 17 7   41  
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized 16 (7)      
Derivative [Member] | Power [Member]
          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Transfers In (Out) (6)   (4)    
Net Derivative Assets (Liabilities) [Member] | PSEG [Member]
          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Opening Balance 57 (61) 31 (21)  
Included in Income 17 [1] (7) [1] (17) [2] 41 [2]  
Included in Regulatory Assets/Liabilities (1) [3] (90) [3]   (55) [3]  
Purchases, (Sales) 0 0 0 0  
Issuances (Settlements) 0 [4] 14 [4] 10 [4] (43) [4]  
Transfers In (Out) 6 [5] 0 [5] 4 [5] 0 [5]  
Closing Balance 35 36 35 36  
Net Derivative Assets (Liabilities) [Member] | Power [Member]
          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Opening Balance 17 (29) (9) (24)  
Included in Income 17 [1] (7) [1] (17) [2] 41 [2]  
Included in Regulatory Assets/Liabilities 0 [3] 0 [3] 0 [3] 0 [3]  
Purchases, (Sales) 0 0 0 0  
Issuances (Settlements) 0 [4] 14 [4] 10 [4] (43) [4]  
Transfers In (Out) 6 [5] 0 [5] 4 [5] 0 [5]  
Closing Balance (6) (22) (6) (22)  
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member]
          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Opening Balance 40 (32) 40 3  
Included in Income 0 [1] 0 [1] 0 [2] 0 [2]  
Included in Regulatory Assets/Liabilities (1) [3] (90) [3] (1) [3]   (55) [3]
Purchases, (Sales) 0 0 0 0  
Issuances (Settlements) 0 [4] 0 [4] 0 [4] 0 [4]  
Transfers In (Out) 0 [5] 0 [5] 0 [5] 0 [5]  
Closing Balance 41 58 41 58 3
Non Recourse Debt [Member] | PSEG [Member]
          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Opening Balance   50   50  
Included in Income   50 [1]   50 [2]  
Included in Regulatory Assets/Liabilities   0 [3]   0 [3]  
Purchases, (Sales)   0   0  
Issuances (Settlements)   0 [4]   0 [4]  
Transfers In (Out)   0 [5]   0 [5]  
Closing Balance   $ 0   $ 0  
[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $17 million and $7 million in Operating Income in 2013 and 2012, respectively. Of the $17 million in Operating Income in 2013, $16 million is unrealized. Of the $7 million in Operating Income in 2012, $(7) million is unrealized. Energy Holdings' release from its obligation under the non-recourse debt is included in PSEG's Operating Income for 2012 and is offset by the write-off of the related assets.
[2] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $(17) million and $41 million in Operating Income in 2013 and 2012, respectively. Of the $(17) million in Operating Income in 2013, $(8) million is unrealized. Of the $41 million in Operating Income in 2012, $(2) million is unrealized. Energy Holdings' release from its obligation under the non-recourse debt is included in PSEG's Operating Income for 2012 and is offset by the write-off of the related assets.
[3] Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or OCI, as they are deferred as a Regulatory Asset/Liability and are expected to be recovered from/returned to PSE&G’s customers.
[4] Represents $(14) million in settlements for the three months ended June 30, 2012. Includes $10 million and $(43) million in settlements for the six months ended June 30, 2013 and 2012, respectively.
[5] During the three months ended June 30, 2013 and six months ended June 30, 2013, $6 million and $4 million, respectively, of net derivatives assets/liabilities were transferred from Level 3 to Level 2 due to more observable pricing for the underlying securities. The transfer was recognized as of the beginning of the first quarter (i.e. the quarter in which the transfer occurred), as per PSEG's policy. There were no transfers among levels during the three months ended June 30, 2012 and the six months ended June 30, 2012.