Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating Revenues		$ 2,313	$ 2,889
Net Income (Loss)		(2)	648
Property, Plant and Equipment, Additions		686	633
Total Assets		47,774		$ 48,999
Investments in Equity Method Subsidiaries		189		173
Public Service Electric and Gas Company [Member]
Segment Reporting Information [Line Items]
Operating Revenues		2,284	2,073
Operating Segments [Member] | Public Service Electric and Gas Company [Member]
Segment Reporting Information [Line Items]
Operating Revenues		2,284	2,073
Net Income (Loss)		509	477
Property, Plant and Equipment, Additions		628	586
Total Assets		38,399		37,198
Investments in Equity Method Subsidiaries		0		0
Operating Segments [Member] | PSEG Power [Member]
Segment Reporting Information [Line Items]
Operating Revenues		460	1,167
Net Income (Loss)		(519)	161
Property, Plant and Equipment, Additions		56	46
Total Assets		7,536		9,777
Investments in Equity Method Subsidiaries		65		62
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[1]	153	151
Net Income (Loss)	[1]	8	10
Property, Plant and Equipment, Additions	[1]	2	1
Total Assets	[1]	3,135		5,150
Investments in Equity Method Subsidiaries	[1]	124		111
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	(584)	(502)
Net Income (Loss)	[2]	0	0
Property, Plant and Equipment, Additions	[2]	0	$ 0
Total Assets	[2]	(1,296)		(3,126)
Investments in Equity Method Subsidiaries	[2]	$ 0		$ 0

[1] 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.

[2] 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.