Income Taxes (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 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
Audit Settlement tax benefit	37
NJ surcharge tax percent for 2018 to 2019		2.50%
NJ tax surcharge percent for 2020 to 2021		1.50%
Public Service Electric and Gas Company [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	83
Audit Settlement tax benefit	9
PSEG Power [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	63
Audit Settlement tax benefit	$ 25