Income Taxes (Schedule Of Effective Tax Rates) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Taxes [Line Items]
Pre-Tax Income	$ (2,246)	$ 696	$ (1,720)	$ 1,748
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	(472)	146	(361)	367
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	(160)	70	(142)	102
Income Tax Reconciliation Deductions Nuclear Decommissioning Trust	(1)	12	17	10
Effective Income Tax Reconciliation, Tax Credit Amortization/Recapture	2	4	(29)	12
Effective Income Tax Rate Reconciliation, Tax Adjustment Credit, Amount	(60)	(63)	(181)	(151)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	13	(40)	11	(42)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	(210)	(25)	(266)	(93)
Income Tax Provision	$ (682)	$ 121	$ (627)	$ 274
Effective tax rate	30.40%	17.40%	36.50%	15.70%
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	$ 463	$ 353	$ 1,389	$ 1,232
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	97	74	292	259
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	33	24	96	78
Effective Income Tax Rate Reconciliation, Tax Adjustment Credit, Amount	(60)	(63)	(181)	(151)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	4	5	7	10
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	(23)	(34)	(78)	(63)
Income Tax Provision	$ 74	$ 40	$ 214	$ 196
Effective tax rate	16.00%	11.30%	15.40%	15.90%
PSEG Power [Member]
Income Taxes [Line Items]
Pre-Tax Income	$ (2,686)	$ 372	$ (3,083)	$ 549
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	(564)	78	(647)	115
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	(191)	30	(236)	9
Income Tax Reconciliation Deductions Nuclear Decommissioning Trust	(1)	12	17	10
Effective Income Tax Reconciliation, Tax Credit Amortization/Recapture	0	2	(36)	6
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount	0	0	(2)	(22)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	3	0	4	6
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	(189)	40	(181)	(3)
Income Tax Provision	$ (753)	$ 118	$ (828)	$ 112
Effective tax rate	28.00%	31.70%	26.90%	20.40%