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Financial Risk Management Activities - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Aoci, cash flow hedge, cumulative gain (loss), after tax	$ 22,000,000		$ 22,000,000		$ 36,000,000
Unrealized gain to be reclassified to earnings during the next twelve months			4,000,000
Reclassification from AOCL, net of tax	0	$ 1,000,000	(5,000,000)	$ (2,000,000)
Derivative, fair value, net	(9,000,000)		(9,000,000)		75,000,000
Issuance of Long-Term Debt			3,600,000,000	3,350,000,000
PSEG Power
Derivatives, Fair Value [Line Items]
Fair value of derivatives with credit-risk related contingent features	51,000,000		51,000,000		17,000,000
Aggregate fair value of derivative contracts in a liability position that contains triggers for additional collateral	27,000,000		27,000,000		11,000,000
Additional collateral aggregate fair value	24,000,000		24,000,000		6,000,000
Derivative, fair value, net	(8,000,000)		(8,000,000)		43,000,000
Public Service Electric and Gas Company [Member]
Derivatives, Fair Value [Line Items]
Issuance of Long-Term Debt			1,350,000,000	2,100,000,000
Total credit exposure with counterparties	0		$ 0
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 AOCL, net of tax	$ 1,000,000	$ 3,000,000	$ 2,000,000	$ 8,000,000	$ 9,000,000

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