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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Included in Income $ 2 $ (4) $ 10 $ (8)      
Settlements (3) (1) (9)        
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) (2) (3) 1 (8)      
Net Derivative Assets (Liabilities) [Member]              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value         $ 1 $ 4 $ 7
Opening Balance 4            
Included in Income (1) [1] 4 10 [1] (8) [1]      
Purchases, (Sales) 0 0 0 0      
Issuances (Settlements) (4) (1) (10) [2] 0 [2]      
Transfers In (Out) [3] 0 0 0 0      
Closing Balance 1 (1) 1 (1)      
Operating Revenues [Member]              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Included in Income (2) (8) 14 (7)      
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) (4) (8) 5 (7)      
Energy Costs [Member]              
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]              
Included in Income 2 4 (4) (1)      
Fair Value, Net Derivative Asset (Liability), Recurring Basis, Still Held, Unrealized Gain (Loss) $ 4 $ 5 $ (4) $ (1)      
[1]
Unrealized gains (losses) in the following table represent the change in derivative assets and liabilities still held as of September 30, 2019 and 2018.
.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
 
 
2019
 
2018
 
2019
 
2018
 
 
 
 
Total Gains (Losses)
 
Unrealized Gains (Losses)
 
Total Gains (Losses)
 
Unrealized Gains (Losses)
 
Total Gains (Losses)
 
Unrealized Gains (Losses)
 
Total Gains (Losses)
 
Unrealized Gains (Losses)
 
 
 
 
Millions
 
 
PSEG and PSEG Power
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Operating Revenues
 
$
(2
)
 
$
(4
)
 
$
(8
)
 
$
(8
)
 
$
14

 
$
5

 
$
(7
)
 
$
(7
)
 
 
Energy Costs
 
4

 
2

 
4

 
5

 
(4
)
 
(4
)
 
(1
)
 
(1
)
 
 
Total
 
$
2

 
$
(2
)
 
$
(4
)
 
$
(3
)
 
$
10

 
$
1

 
$
(8
)
 
$
(8
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
[2] settlements of $(3) million and $(9) million for the three months and nine months ended September 30, 2019 and $(1) million for the three months ended September 30, 2018.
[3]
There were no transfers into or out of Level 3 during the three months and nine months ended September 30, 2019 and 2018.