Income Taxes (Schedule Of Effective Tax Rates) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Taxes [Line Items]
Pre-Tax Income	$ (239)	$ 560	$ 526	$ 1,052
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	(50)	118	110	221
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	(24)	25	18	32
Income Tax Reconciliation Deductions Nuclear Decommissioning Trust	9	24	18	(2)
Effective Income Tax Reconciliation, Tax Credit Amortization/Recapture	(35)	4	(31)	8
Effective Income Tax Rate Reconciliation, Tax Adjustment Credit, Amount	(42)	(45)	(121)	(88)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	10	(9)	(1)	(2)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	(12)	(9)	(55)	(68)
Income Tax Provision	$ (62)	$ 109	$ 55	$ 153
Effective tax rate	25.90%	19.50%	10.50%	14.50%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%
Public Service Electric and Gas Company [Member]
Income Taxes [Line Items]
Pre-Tax Income	$ 370	$ 330	$ 926	$ 879
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	78	69	194	185
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	25	17	63	54
Effective Income Tax Rate Reconciliation, Tax Adjustment Credit, Amount	(42)	(45)	(121)	(88)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	0	6	4	5
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	(17)	(22)	(54)	(29)
Income Tax Provision	$ 61	$ 47	$ 140	$ 156
Effective tax rate	16.50%	14.20%	15.10%	17.70%
PSEG Power [Member]
Income Taxes [Line Items]
Pre-Tax Income	$ (610)	$ 234	$ (397)	$ 177
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	(128)	49	(83)	37
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	(49)	10	(45)	(21)
Income Tax Reconciliation Deductions Nuclear Decommissioning Trust	9	24	18	(2)
Effective Income Tax Reconciliation, Tax Credit Amortization/Recapture	(38)	2	(36)	4
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount	0	(20)	(2)	(22)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	3	3	1	6
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	1	15	8	(43)
Income Tax Provision	$ (127)	$ 64	$ (75)	$ (6)
Effective tax rate	20.80%	27.40%	18.90%	(3.40%)