Pension and Other Postretirement Benefits (OPEB) - Schedule of Pension and OPEB Costs (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	$ 18	$ 349	$ 52	$ 389
Pension Benefits [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	11	10	32	37
Pension Benefits [Member] | PSEG Power & Other
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	7	339	20	352
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	1	(11)	4	(32)
OPEB [Member] | Public Service Electric and Gas Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	0	(11)	(1)	(31)
OPEB [Member] | PSEG Power & Other
Defined Benefit Plan Disclosure [Line Items]
Total Net Benefit (Credits) Costs	$ 1	$ 0	$ 5	$ (1)