Pension and Other Postretirement Benefits (OPEB) - Schedule of Pension and OPEB Costs (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	$ 19	$ 17	$ 37	$ 34
Pension Benefits [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	12	10	24	21
Pension Benefits [Member] | PSEG Power & Other
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	7	7	13	13
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	0	2	1	3
OPEB [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	(1)	(1)	(2)	(1)
OPEB [Member] | PSEG Power & Other
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	$ 1	$ 3	$ 3	$ 4