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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, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Net Assets Measured At Fair Value On A Recurring Basis $ 2,600 $ 2,200
Net Assets Measured At Fair Value On A Recurring Basis Measured Using Unobservable Input And Classified As Level3 7 1
PSEG Power LLC    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Included in Income 14 (6)
Unrealized Gains (Losses) 6 (6)
Net Derivative Assets (Liabilities) [Member] | PSEG Power LLC    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Opening Balance 1 7
Included in Income [1] 14 (6)
Purchases, (Sales) 0 0
Issuances (Settlements) [2] (8) 0
Transfers In (Out) [3] 0 0
Closing Balance 7 1
Operating Revenues [Member] | PSEG Power LLC    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Included in Income 23 (2)
Unrealized Gains (Losses) 12 0
Energy Costs [Member] | PSEG Power LLC    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Included in Income (6) (6)
Unrealized Gains (Losses) $ (9) $ (4)
[1] Unrealized gains (losses) in the following table represent the change in derivative assets and liabilities still held as of December 31, 2019 and 2018.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Years Ended December 31,
 
 
 
 
2019
 
2018
 
 
 
 
Total Gains (Losses)
 
Unrealized Gains (Losses)
 
Total Gains (Losses)
 
Unrealized Gains (Losses)
 
 
 
 
Millions
 
 
PSEG and PSEG Power
 
 
 
 
 
 
 
 
 
 
Operating Revenues
 
$
23

 
$
12

 
$
(2
)
 
$

 
 
Energy Costs
 
(9
)
 
(6
)
 
(4
)
 
(6
)
 
 
Total
 
$
14

 
$
6

 
$
(6
)
 
$
(6
)
 
 
 
 
 
 
 
 
 
 
 
 

[2] $(7) million in settlements for derivative contracts in 2019.
[3]
There were no transfers in 2019 and 2018 to or from Level 3.