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Financial Risk Management Activities (Narrative) (Detail)
$ / Derivative in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
$ / Derivative
Dec. 31, 2019
USD ($)
$ / Derivative
Dec. 31, 2018
USD ($)
Derivatives, Fair Value [Line Items]      
Derivative, Fair Value, Net   $ 100 $ (3)
Net cash collateral received in connection with net derivative contracts   (2) 153
Accumulated Other Comprehensive Income (Loss) on interest rate derivatives   (15) (1)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months   $ (2)  
PSEG [Member] | Senior Notes Two Point Eight Seven Five Percent due Two Thousand Twenty Four [Member]      
Derivatives, Fair Value [Line Items]      
Stated interest rate of debt instrument   2.875%  
Debt Instrument, Face Amount   $ 750  
PSEG Power LLC      
Derivatives, Fair Value [Line Items]      
Derivative, Fair Value, Net [1]   105 (3)
Credit Risk Derivative Liabilities, at Fair Value   35 22
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral   2 7
Additional collateral aggregate fair value   $ 33 $ 15
PSEG Power LLC | Senior Notes Three Point Eight Five Percent due Two Thousand Twenty Three [Member]      
Derivatives, Fair Value [Line Items]      
Stated interest rate of debt instrument   3.85%  
Interest Rate Swaps [Member] | PSEG [Member]      
Derivatives, Fair Value [Line Items]      
Underlying, Derivative | $ / Derivative 600    
Loss on termination of interest rate hedges $ (12)    
Interest Rate Swaps [Member] | PSEG [Member] | Term Loan maturing in 2020 [Member]      
Derivatives, Fair Value [Line Items]      
Underlying, Derivative | $ / Derivative   700  
Interest Rate Swaps [Member] | Fair Value Hedging [Member] | PSEG [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Fair Value, Net [1]   $ (5)  
[1]
Substantially all of PSEG Power’s and PSEG’s derivative instruments are contracts subject to master netting agreements. Contracts not subject to master netting or similar agreements are immaterial and did not have any collateral posted or received as of December 31, 2019 and 2018.