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Financial Risk Management Activities (Narrative) (Detail)
$ / Derivative in Millions, $ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
$ / Derivative
Dec. 31, 2019
USD ($)
$ / Derivative
Derivatives, Fair Value [Line Items]    
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax $ (11) $ (15)
Derivative, Fair Value, Net 54 100
Unrealized Loss to be Reclassified to Earnings During the Next Twelve Months (4)  
PSEG Power [Member]    
Derivatives, Fair Value [Line Items]    
Securities held as Collateral 34  
Derivative, Fair Value, Amount Offset Against Collateral, Net [1],[2] (1) (2)
Fair Value of Derivatives with credit-risk related contingent features 16 35
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral 11 2
Additional collateral aggregate fair value 5 33
Derivative, Fair Value, Net [2] $ 56 $ 105
Interest Rate Swaps [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Hedge outstanding | $ / Derivative 700 700
Interest Rate Swaps [Member] | PSEG [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Hedge outstanding | $ / Derivative 700 700
Interest Rate Swaps [Member] | PSEG Power [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Hedge outstanding | $ / Derivative 0 0
Interest Rate Swaps [Member] | Public Service Electric and Gas Company [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Hedge outstanding | $ / Derivative 0 0
Term Loan maturing in 2020 [Member] | Interest Rate Swap [Member] | PSEG [Member]    
Derivatives, Fair Value [Line Items]    
Interest Rate Hedge outstanding | $ / Derivative 700  
Fair Value Hedging [Member] | Interest Rate Swap [Member] | PSEG [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Fair Value, Net [2] $ (2) $ (5)
[1] Represents the netting of fair value balances with the same counterparty (where the right of offset exists) and the application of collateral. All cash collateral (received) posted that has been allocated to derivative positions, where the right of offset exists, has been offset on the Condensed Consolidated Balance Sheets. As of September 30, 2020 and December 31, 2019, PSEG Power had net cash collateral (receipts) payments to counterparties of $56 million and $44 million, respectively. Of these net cash collateral (receipts) payments, $(1) million and $(2) million as of September 30, 2020 and December 31, 2019, respectively, were netted against the corresponding net derivative contract positions. Of the $(1) million as of September 30, 2020, $(11) million was netted against current assets, $(1) million was netted against noncurrent assets, and $11 million was netted against noncurrent liabilities. Of the $(2) million as of December 31, 2019, $(1) million was netted against current assets and $(1) million was netted against noncurrent assets
[2] 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 September 30, 2020 and December 31, 2019.