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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, 2018
Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Included in Income [1] $ (6) $ 26
Transfers In (Out)   (1)
Settlements   24
Net Assets Measured At Fair Value On A Recurring Basis 2,200 2,600
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3 1 7
Unrealized Gains (Losses) (6) 3
Net Derivative Assets (Liabilities) [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Opening Balance 7 1
Included in Income [1] (6) 26
Included in Regulatory Assets/Liabilities [2] 0 5
Purchases, (Sales) 0 0
Issuances (Settlements) [3] 0 (24)
Transfers In (Out) 0 [4] (1)
Closing Balance 1 7
Net Derivative Assets (Liabilities) [Member] | Power [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Opening Balance 7 6
Included in Income [1] (6) 26
Included in Regulatory Assets/Liabilities [2] 0 0
Purchases, (Sales) 0 0
Issuances (Settlements) [3] 0 (24)
Transfers In (Out) 0 [4] (1)
Closing Balance 1 7
Net Derivative Assets (Liabilities) [Member] | PSE&G [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Opening Balance 0 (5)
Included in Income [1]   0
Included in Regulatory Assets/Liabilities [2]   5
Purchases, (Sales)   0
Issuances (Settlements) [3]   0
Transfers In (Out)   0
Closing Balance   0
Operating Revenues [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Included in Income [1] (2) 14
Unrealized Gains (Losses) 0 (9)
Energy Costs [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Included in Income [1] (4) 12
Unrealized Gains (Losses) $ (6) $ 12
[1] Unrealized gains (losses) in the following table represent the change in derivative assets and liabilities still held as of December 31, 2018 and 2017.
[2] (B)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 custom
[3] Represents $(24) million in settlements for derivative contracts in 2017.
[4] During the year ended December 31, 2017, $(1) million of net derivatives assets/liabilities were transferred from Level 2 to Level 3. There were no transfers in 2018.