Financial Information By Business Segments (Financial Information By Business Segments) (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Segment Reporting Information [Line Items]
Operating Revenues		$ 9,722		$ 9,603		$ 10,076
Depreciation and Amortization		1,216		1,285		1,248
Operating Income (Loss)		(856)		2,270		1,943
Income from Equity Method Investments		16		14		14
Interest Income		20		25		26
Interest Expense		(571)		(600)		(569)
Income (Loss) before Income Taxes		(1,089)		2,301		1,950
Income Tax Expense (Benefit)		(441)		396		257
Net Income (Loss)		(648)	[1]	1,905	[1]	1,693
Gross Additions to Long-Lived Assets		2,719		2,923		3,166
Total Assets		48,999		50,050		47,730
Investments in Equity Method Subsidiaries		173		64		67
PSEG Power LLC [Member]
Segment Reporting Information [Line Items]
Gain (loss) on sale, net of tax		(2,158)		86		(286)
Public Service Electric and Gas Company
Segment Reporting Information [Line Items]
Operating Revenues		7,122		6,608		6,625
Retained Earnings [Member]
Segment Reporting Information [Line Items]
Net Income (Loss)		(648)		1,905		1,693
Operating Segments [Member] | PSEG Power LLC [Member]
Segment Reporting Information [Line Items]
Operating Revenues		3,147		3,634		4,385
Depreciation and Amortization		256		368		377
Operating Income (Loss)		(2,711)		603		448
Income from Equity Method Investments		16		14		14
Interest Income		2		6		7
Interest Expense		(78)		(121)		(119)
Income (Loss) before Income Taxes		(2,808)		782		671
Income Tax Expense (Benefit)		(752)		188		203
Net Income (Loss)		(2,056)	[1]	594	[1]	468
Gross Additions to Long-Lived Assets		259		404		607
Total Assets		9,777		12,704		12,805
Investments in Equity Method Subsidiaries		62		64		66
non trading commodity mark to market gains (losses), net of tax		(446)		(58)		205
Operating Segments [Member] | Public Service Electric and Gas Company
Segment Reporting Information [Line Items]
Operating Revenues		7,122		6,608		6,625
Depreciation and Amortization		928		887		837
Operating Income (Loss)		1,818		1,639		1,469
Income from Equity Method Investments		0		0		0
Interest Income		14		17		18
Interest Expense		(402)		(388)		(361)
Income (Loss) before Income Taxes		1,770		1,567		1,343
Income Tax Expense (Benefit)		324		240		93
Net Income (Loss)		1,446		1,327		1,250
Gross Additions to Long-Lived Assets		2,447		2,507		2,542
Total Assets		37,198		35,581		33,266
Investments in Equity Method Subsidiaries		0		0		0
Operating Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[2]	620		595		549
Depreciation and Amortization	[2]	32		30		34
Operating Income (Loss)	[2]	37		28		26
Income from Equity Method Investments	[2]	0		0		0
Interest Income	[2]	8		5		6
Interest Expense	[2]	(95)		(94)		(94)
Income (Loss) before Income Taxes	[2]	(51)		(48)		(64)
Income Tax Expense (Benefit)	[2]	(13)		(32)		(39)
Net Income (Loss)	[2]	(38)		(16)		(25)
Gross Additions to Long-Lived Assets	[2]	13		12		17
Total Assets	[2]	5,150		2,692		2,715
Investments in Equity Method Subsidiaries	[2]	111		0		1
Eliminations [Member]
Segment Reporting Information [Line Items]
Operating Revenues	[3]	(1,167)		(1,234)		(1,483)
Depreciation and Amortization	[3]	0		0		0
Operating Income (Loss)	[3]	0		0		0
Income from Equity Method Investments	[3]	0		0		0
Interest Income	[3]	(4)		(3)		(5)
Interest Expense	[3]	4		3		5
Income (Loss) before Income Taxes	[3]	0		0		0
Income Tax Expense (Benefit)	[3]	0		0		0
Net Income (Loss)	[3]	0		0		0
Gross Additions to Long-Lived Assets	[3]	0				0
Total Assets	[3]	(3,126)		(927)		(1,056)
Investments in Equity Method Subsidiaries	[3]	$ 0		$ 0		$ 0

[1] 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. Includes an after-tax gain of $86 million in the year ended December 31, 2020 related to the sale of PSEG Power’s interest in the Yards Creek generation facility and an after-tax loss of $286 million in the year ended December 31, 2019 related to the sale of PSEG Power’s ownership interests in the Keystone and Conemaugh fossil generation plants. See Note 4. Early Plant Retirements/Asset Dispositions and Impairments for additional information.(D)Includes net after-tax losses of $446 million and $58 million in the years ended December 31, 2021 and 2020 and a net after-tax gain of $205 million in the year ended December 31, 2019 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.

[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 corporation) 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 26. Related-Party Transactions.