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Financial Risk Management Activities - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Derivatives, Fair Value [Line Items]          
Aoci, cash flow hedge, cumulative gain (loss), after tax $ 12   $ 12   $ 3
Unrealized gain to be reclassified to earnings during the next twelve months     3    
Reclassification from accumulated other comprehensive income, current period, net of tax 1 $ (243) (2) $ (260)  
Derivative, fair value, net 47   47   49
Issuance of Long-term Debt     3,350 1,800  
PSEG Power          
Derivatives, Fair Value [Line Items]          
Fair value of derivatives with credit-risk related contingent features 32   32   77
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral 12   12   3
Additional collateral aggregate fair value 20   20   74
Derivative, fair value, net 49   49   60
Public Service Electric and Gas Company [Member]          
Derivatives, Fair Value [Line Items]          
Issuance of Long-term Debt     2,100 1,800  
Total credit exposure with counterparties 0   0    
Interest Rate Swap | Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Derivative, fair value, net (2)   (2)   (11)
Interest Rate Swap | PSEG [Member]          
Derivatives, Fair Value [Line Items]          
Derivative, fair value, net (3)   $ (3)    
Investment Grade - External Rating | PSEG Power          
Derivatives, Fair Value [Line Items]          
Percentage of credit exposure     100.00%    
Investment Grade - External Rating | PSEG Power | Minimum [Member]          
Derivatives, Fair Value [Line Items]          
Percentage of credit exposure     10.00%    
Cash Flow Hedges [Member]          
Derivatives, Fair Value [Line Items]          
Reclassification from accumulated other comprehensive income, current period, net of tax 3 $ 2 $ 8 $ 2 3
Three Year Variable Rate Term Loan          
Derivatives, Fair Value [Line Items]          
Interest rate cash flow hedge derivative at fair value, net 1,250   1,250    
Three Year Variable Rate Term Loan | PSEG Power          
Derivatives, Fair Value [Line Items]          
Issuance of Long-term Debt     1,250    
Three Year Variable Rate Term Loan | Interest Rate Swap | Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Derivative, fair value, net $ 1   $ 1   $ 5