Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,456	$ 2,272	$ 8,632	$ 6,661
Net Income (Loss)	[1]	139	114	2,017	243
Property, Plant and Equipment, Additions		916	797	2,360	2,088
Total Assets		49,552		49,552		$ 48,718
Investments in Equity Method Subsidiaries		15		15		306
Pension Lift Out Settlement Charge, net of tax		239		239
Operating Segments [Member] | Public Service Electric and Gas Company [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,999	1,953	5,954	5,905
Net Income (Loss)		401	399	1,224	1,213
Property, Plant and Equipment, Additions		813	700	2,149	1,871
Total Assets		41,867		41,867		39,960
Investments in Equity Method Subsidiaries		0		0		0
Operating Segments [Member] | PSEG Power & Other
Segment Reporting Information [Line Items]
Operating Revenues	[2]	546	433	3,475	1,691
Net Income (Loss)	[1]	(262)	(285)	793	(970)
Property, Plant and Equipment, Additions		103	97	211	217
Total Assets		7,916		7,916		9,285
Investments in Equity Method Subsidiaries		15		15		306
non trading commodity mark to market gains (losses), net of tax		(17)	(214)	750	(896)
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[3]	(89)	(114)	(797)	(935)
Net Income (Loss)	[3]	0	0	0	0
Property, Plant and Equipment, Additions	[3]	0	$ 0	0	$ 0
Total Assets	[3]	(231)		(231)		(527)
Investments in Equity Method Subsidiaries	[3]	$ 0		$ 0		$ 0

[1] Includes net after-tax gains (losses) of $(17) million and $(214) million for the three months and $750 million and $(896) million for the nine months ended September 30, 2023 and 2022, respectively, at PSEG Power related to the impacts of non-trading commodity mark-to-market activity, which consist of the financial impact from positions with future delivery dates. Includes a $239 million after-tax pension charge due to the remeasurement of the qualified pension plans as a result of the pension settlement transaction for the three and nine months ended September 30, 2023. See Note 9. Pension and Other Postretirement Benefits (OPEB) .

[2] Includes revenues applicable to PSEG Power, PSEG LI and Energy Holdings.

[3] Intercompany eliminations primarily relate to intercompany transactions between PSE&G and PSEG Power. For a further discussion of the intercompany transactions between PSE&G and PSEG Power, see Note 19. Related-Party Transactions.