Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,272	$ 1,903	$ 6,661	$ 6,666
Net Income (Loss)	[1]	114	(1,564)	243	(1,093)
Property, Plant and Equipment, Additions		797	743	2,088	2,046
Total Assets		47,741		47,741		$ 48,999
Investments in Equity Method Subsidiaries		272		272		173
Public Service Electric and Gas Company [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,953	1,820	5,905	5,407
PSEG Power [Member]
Segment Reporting Information [Line Items]
Gain (loss) on sale, net of tax			1,563		1,936
Other [Member]
Segment Reporting Information [Line Items]
Gain (loss) on sale, net of tax		38
Operating Segments [Member] | Public Service Electric and Gas Company [Member]
Segment Reporting Information [Line Items]
Operating Revenues		1,953	1,820	5,905	5,407
Net Income (Loss)		399	389	1,213	1,175
Property, Plant and Equipment, Additions		700	599	1,871	1,818
Total Assets		38,830		38,830		37,198
Investments in Equity Method Subsidiaries		0		0		0
Operating Segments [Member] | PSEG Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		266	51	1,214	1,598
Net Income (Loss)	[1]	(241)	(1,933)	(922)	(2,255)
Property, Plant and Equipment, Additions		90	140	206	222
Total Assets		6,985		6,985		9,777
Investments in Equity Method Subsidiaries		72		72		62
non trading commodity mark to market gains (losses), net of tax		214	478	896	718
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	167	159	477	465
Net Income (Loss)	[2]	(44)	(20)	(48)	(13)
Property, Plant and Equipment, Additions	[2]	7	4	11	6
Total Assets	[2]	2,564		2,564		5,150
Investments in Equity Method Subsidiaries	[2]	200		200		111
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[3]	(114)	(127)	(935)	(804)
Net Income (Loss)	[3]	0	0	0	0
Property, Plant and Equipment, Additions	[3]	0	$ 0	0	$ 0
Total Assets	[3]	(638)		(638)		(3,126)
Investments in Equity Method Subsidiaries	[3]	$ 0		$ 0		$ 0

[1] Includes after-tax impairment losses and other charges related to the sale of the Fossil generating assets at PSEG Power of $1,563 million and $1,936 million for the three and nine months ended September 30, 2021. See Note 4. Early Plant Retirements/Asset Dispositions and Impairments for additional information. Also includes net after-tax losses of $214 million and $478 million for the three months ended September 30, 2022 and 2021, respectively, and $896 million and $718 million for the nine months ended September 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. Other includes a $38 million after-tax impairment of assets related to one of Energy Holdings’ generating facilities for the three and nine months ended September 30, 2022.

[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.