Income Taxes (Reconciliation Of Reported Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Income Taxes [Line Items]
Net Income	$ 1,905	[1]	$ 1,693	[1]	$ 1,438
Federal	385		84		(97)
State	48		18		83
Total Current	433		102		(14)
Federal	(164)		3		373
State	141		132		71
Total Deferred	(23)		135		444
Investment tax credit	(14)		20		(13)
Total Income Tax	396		257		417
Pre-Tax Income	2,301		1,950		1,855
Tax Computed at Statutory Rate	483		410		390
State Income Taxes (net of federal income tax)	147		117		123
Uncertain Tax Positions	3		0		(24)
Nuclear Decommissioning Trust	32		34		(13)
Plant-Related Items	(9)		(2)		(10)
Tax Credits	(18)		(18)		(16)
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount	(27)		0		0
Effective Income Tax Rate Reconciliation, Leasing Activities, Amount	(35)		0		0
Tax Adjustment Credit	(205)		(272)		(30)
Effective Income Tax Rate Reconciliation, Bad Debt Flow Through, Amount	28		0		0
Other	(3)		(12)		(6)
Sub-Total	(87)		(153)		27
Income Tax Provision	$ 396		$ 257		$ 417
Effective income tax rate	17.20%		13.20%		22.50%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 0		$ 0		$ 3
Public Service Electric and Gas Company
Income Taxes [Line Items]
Net Income	1,327		1,250		1,067
Federal	179		121		(62)
State	8		0		1
Total Current	187		121		(61)
Federal	(71)		(156)		287
State	128		117		122
Total Deferred	57		(39)		409
Investment tax credit	(4)		11		(4)
Total Income Tax	240		93		344
Pre-Tax Income	1,567		1,343		1,411
Tax Computed at Statutory Rate	329		282		296
State Income Taxes (net of federal income tax)	106		92		98
Uncertain Tax Positions	4		1		(1)
Plant-Related Items	(9)		(2)		(10)
Tax Credits	(9)		(8)		(8)
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount	(2)		0		0
Tax Adjustment Credit	(205)		(272)		(30)
Effective Income Tax Rate Reconciliation, Bad Debt Flow Through, Amount	28		0		0
Other	(2)		0		(1)
Sub-Total	(89)		(189)		48
Income Tax Provision	$ 240		$ 93		$ 344
Effective income tax rate	15.30%		6.90%		24.40%
PSEG Power LLC
Income Taxes [Line Items]
Net Income	$ 594		$ 468		$ 365
Federal	135		(48)		(164)
State	(7)		3		24
Total Current	128		(45)		(140)
Federal	39		208		214
State	31		31		1
Total Deferred	70		239		215
Investment tax credit	(10)		9		(9)
Total Income Tax	188		203		66
Pre-Tax Income	782		671		431
Tax Computed at Statutory Rate	164		141		91
State Income Taxes (net of federal income tax)	18		25		21
Uncertain Tax Positions	5		11		(24)
Nuclear Decommissioning Trust	32		34		(13)
Tax Credits	(9)		(10)		(7)
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount	(21)		0		0
Other	(1)		2		(1)
Sub-Total	24		62		(25)
Income Tax Provision	$ 188		$ 203		$ 66
Effective income tax rate	24.00%		30.30%		15.30%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount	$ 0		$ 0		$ (1)

[1] 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 for additional information.