Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended		12 Months Ended
		Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating Revenues				$ 11,237	$ 9,800	$ 9,722
Depreciation and Amortization				1,135	1,100	1,216
Operating Income (Loss)				3,685	1,381	(856)
Income from Equity Method Investments				1	14	16
Interest Income				53	31	20
Interest Expense				(748)	(628)	(571)
Income (Loss) before Income Taxes				3,081	1,002	(1,089)
Income Tax Expense (Benefit)				518	(29)	(441)
Net Income (Loss)	[1],[2]			2,563	1,031	(648)
Gross Additions to Long-Lived Assets				3,325	2,888	2,719
Total Assets		$ 50,741		50,741	48,718	48,999
Investments in Equity Method Subsidiaries		17		17	306	173
Pension Lift Out Settlement Charge, net of tax		4	$ 239	240
PSEG Power & Other
Segment Reporting Information [Line Items]
Gain (loss) on sale, net of tax					(92)	(2,158)
Retained Earnings [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)				2,563	1,031	(648)
Operating Segments [Member] | Public Service Electric and Gas Company
Segment Reporting Information [Line Items]
Operating Revenues				7,807	7,935	7,122
Depreciation and Amortization				980	935	928
Operating Income (Loss)				1,974	1,892	1,818
Income from Equity Method Investments				0	0	0
Interest Income				19	19	14
Interest Expense				(493)	(427)	(402)
Income (Loss) before Income Taxes				1,675	1,832	1,770
Income Tax Expense (Benefit)				160	267	324
Net Income (Loss)				1,515	1,565	1,446
Gross Additions to Long-Lived Assets				2,998	2,590	2,447
Total Assets		42,873		42,873	39,960	37,198
Investments in Equity Method Subsidiaries		0		0	0	0
Operating Segments [Member] | PSEG Power & Other
Segment Reporting Information [Line Items]
Operating Revenues	[3]			4,533	3,266	3,767
Depreciation and Amortization				155	165	288
Operating Income (Loss)				1,711	(511)	(2,674)
Income from Equity Method Investments				1	14	16
Interest Income				38	13	6
Interest Expense				(259)	(202)	(169)
Income (Loss) before Income Taxes				1,406	(830)	(2,859)
Income Tax Expense (Benefit)				358	(296)	(765)
Net Income (Loss)	[1],[2]			1,048	(534)	(2,094)
Gross Additions to Long-Lived Assets				327	298	272
Total Assets		8,407		8,407	9,285	12,258
Investments in Equity Method Subsidiaries		17		17	306	173
non trading commodity mark to market gains (losses), net of tax				959	(457)	(446)
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[4]			(1,103)	(1,401)	(1,167)
Depreciation and Amortization	[4]			0	0	0
Operating Income (Loss)	[4]			0	0	0
Income from Equity Method Investments	[4]			0	0	0
Interest Income	[4]			(4)	(1)	0
Interest Expense	[4]			4	1	0
Income (Loss) before Income Taxes	[4]			0	0	0
Income Tax Expense (Benefit)	[4]			0	0	0
Net Income (Loss)	[4]			0	0	0
Gross Additions to Long-Lived Assets	[4]			0	0	0
Total Assets	[4]	(539)		(539)	(527)	(457)
Investments in Equity Method Subsidiaries	[4]	$ 0		$ 0	$ 0	$ 0

[1] 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 in the third quarter of 2023. Includes after-tax impairments of $92 million related to certain Energy Holdings investments and additional adjustments related to the sale of PSEG Power’s fossil generation assets in the year ended December 31, 2022. Includes after-tax impairment losses and other charges, including debt extinguishment costs, related to the sale of the fossil generating assets at PSEG Power of $2,158 million in the year ended December 31, 2021. See Note 3. Asset Dispositions and Impairments for additional information.

[2] Includes net after-tax gain (loss) of $959 million, $(457) million and $(446) million in the years ended December 31, 2023, 2022 and 2021, respectively at PSEG Power related to the impacts of non-trading commodity mark-to-market activity, which consists of the financial impact from positions with future delivery dates.

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

[4] 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 24. Related-Party Transactions.