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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 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Settlements $ (4) $ (1) $ 54 $ 9
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 (8) 1 (66) (16)
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized (12) 1 (11) (7)
Net Derivative Assets (Liabilities) [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Opening Balance 13 (35) 88 (31)
Included in Income (8) [1] 1 [1] (66) [1] (16) [1]
Included in Regulatory Assets/Liabilities (9) [2] (11) [2] (81) [2] (12) [2]
Purchases, (Sales) 0 0 0 0
Issuances (Settlements) (4) [3] (1) [3] 54 [3] 9 [3]
Transfers In (Out) 0 [4] 0 [4] (3) [4] 4 [4]
Closing Balance (8) (46) (8) (46)
Net Derivative Assets (Liabilities) [Member] | Power [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Opening Balance (9) 6 (6) 9
Included in Income (8) [1] 1 [1] (66) [1] (16) [1]
Included in Regulatory Assets/Liabilities 0 [2] 0 [2] 0 [2] 0 [2]
Purchases, (Sales) 0 0 0 0
Issuances (Settlements) (4) [3] (1) [3] 54 [3] 9 [3]
Transfers In (Out) 0 [4] 0 [4] (3) [4] 4 [4]
Closing Balance (21) 6 (21) 6
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member]
        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Opening Balance 22 (41) 94 (40)
Included in Income 0 [1] 0 [1] 0 [1] 0 [1]
Included in Regulatory Assets/Liabilities (9) [2] (11) [2] (81) [2] (12) [2]
Purchases, (Sales) 0 0 0 0
Issuances (Settlements) 0 [3] 0 [3] 0 [3] 0 [3]
Transfers In (Out) 0 [4] 0 [4] 0 [4] 0 [4]
Closing Balance $ 13 $ (52) $ 13 $ (52)
[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $(8) million and $(66) million in Operating Income for the three months and nine months ended September 30, 2014, respectively. Of the $(8) million in Operating Income $(12) million is unrealized. Of the $(66) million in Operating Income, $(11) million is unrealized.
[2] Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or Other Comprehensive Income, as they are deferred as a Regulatory Asset/Liability and are expected to be recovered from/returned to PSE&G’s customers.
[3] Represents $(4) million and $54 million in settlements for the three months and nine months ended September 30, 2014. Represents $(1) million and $9 million in settlements for the three months and nine months ended September 30, 2013
[4] three months ended September 30, 2014 and 2013. During the nine months ended September 30, 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. During the nine months ended September 30, 2013, $4 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 in which the transfers first occurred, as per PSEG's policy.