Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Income Taxes [Line Items]
Effective Income Tax Rate, Federal and State Statutory Income Tax Rate, Percent		28.11%
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	$ 149
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount	37
Public Service Electric and Gas Company [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	83
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount	9
PSEG Power [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	63
Effective Income Tax Rate Reconciliation, Tax Settlement, Domestic, Amount	$ 25