Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,076	$ 1,874	$ 4,389	$ 4,763
Net Income (Loss)	[1]	131	(177)	129	471
Property, Plant and Equipment, Additions		605	670	1,291	1,303
Total Assets		49,608		49,608		$ 48,999
Investments in Equity Method Subsidiaries		245		245		173
Public Service Electric and Gas Company [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,668	1,514	3,952	3,587
PSEG Power [Member]
Segment Reporting Information [Line Items]
Gain (loss) on sale, net of tax			373		373
Operating Segments [Member] | Public Service Electric and Gas Company [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,668	1,514	3,952	3,587
Net Income (Loss)		305	309	814	786
Property, Plant and Equipment, Additions		543	633	1,171	1,219
Total Assets		39,181		39,181		37,198
Investments in Equity Method Subsidiaries		0		0		0
Operating Segments [Member] | PSEG Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		488	380	948	1,547
Net Income (Loss)	[1]	(162)	(483)	(681)	(322)
Property, Plant and Equipment, Additions		60	36	116	82
Total Assets		7,425		7,425		9,777
Investments in Equity Method Subsidiaries		71		71		62
non trading commodity mark to market gains (losses), net of tax		74	206	682	240
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	157	155	310	306
Net Income (Loss)	[2]	(12)	(3)	(4)	7
Property, Plant and Equipment, Additions	[2]	2	1	4	2
Total Assets	[2]	3,755		3,755		5,150
Investments in Equity Method Subsidiaries	[2]	174		174		111
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[3]	(237)	(175)	(821)	(677)
Net Income (Loss)	[3]	0	0	0	0
Property, Plant and Equipment, Additions	[3]	0	$ 0	0	$ 0
Total Assets	[3]	(753)		(753)		(3,126)
Investments in Equity Method Subsidiaries	[3]	$ 0		$ 0		$ 0

[1] Includes a $373 million after-tax impairment of the ISO NE asset grouping at PSEG Power in the three and six months ended June 30, 2021. See Note 4. Early Plant Retirements/Asset Dispositions and Impairments for additional information. Also includes net after-tax losses of $74 million and $206 million for the three months ended June 30, 2022 and 2021, respectively, and $682 million and $240 million for the six months ended June 30, 2022 and 2021, respectively, related to the impacts of non-trading commodity mark-to-market activity, which consist of the financial impact from positions with future delivery dates.

[2] Includes amounts applicable to Energy Holdings and PSEG LI, which are below the quantitative threshold for separate disclosure as reportable segments. Other also includes amounts applicable to PSEG (parent company) and Services.

[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 20. Related-Party Transactions.