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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
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Settlements $ (4) $ (2) $ (24) $ (18)
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 4 24 12
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized 4     (6)
Net Derivative Assets (Liabilities) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Opening Balance 5 8 13 37
Included in Income 8 [1] 4 [2] 24 [1] 12 [2]
Included in Regulatory Assets/Liabilities [3] (2) (8) (6) (29)
Purchases, (Sales) 4 0 4 0
Issuances (Settlements) [4] (4) (2) (24) (18)
Transfers In (Out) [5] 0 0 0 0
Closing Balance 11 2 11 2
Net Derivative Assets (Liabilities) [Member] | Power [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Opening Balance 7 3 11 11
Included in Income 8 [1] 4 [2] 24 [1] 12 [2]
Included in Regulatory Assets/Liabilities [3] 0 0 0 0
Purchases, (Sales) 4 0 4 0
Issuances (Settlements) [4] (4) (2) (24) (18)
Transfers In (Out) [5] 0 0 0 0
Closing Balance 15 5 15 5
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Opening Balance (2) 5 2 26
Included in Income 0 [1] 0 [2] 0 [1] 0 [2]
Included in Regulatory Assets/Liabilities [3] (2) (8) (6) (29)
Purchases, (Sales) 0 0 0 0
Issuances (Settlements) [4] 0 0 0 0
Transfers In (Out) [5] 0 0 0 0
Closing Balance $ (4) $ (3) $ (4) $ (3)
[1] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $8 million and $24 million in Operating Income for the three months and nine months ended September 30, 2016, respectively. Of the $8 million in Operating Income, $4 million is unrealized. The $24 million in Operating Income is realized.
[2] PSEG’s and Power’s gains and losses attributable to changes in net derivative assets and liabilities include $4 million and $12 million in Operating Income for the three months and nine months ended September 30, 2015, respectively. Of the $4 million in Operating Income, $3 million is unrealized. Of the $12 million in Operating Income, $(6) million is unrealized.
[3] Mainly includes gains/losses on PSE&G’s derivative contracts that are not included in either earnings or Accumulated 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.
[4] Represents $(4) million and $(24) million in settlements for the three months and nine months ended September 30, 2016, respectively. Represents $(2) million and $(18) million in settlements for the three months and nine months ended September 30, 2015, respectively.
[5] There were no transfers among levels during the three months and nine months ended September 30, 2016 and 2015.