Income Taxes (Interest And Penalties Related To Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Accumulated Interest and Penalties on Uncertain Tax Positions	$ 29	$ 40	$ 43
Public Service Electric and Gas Company
Income Taxes [Line Items]
Accumulated Interest and Penalties on Uncertain Tax Positions	9	16	12
PSEG Power LLC
Income Taxes [Line Items]
Accumulated Interest and Penalties on Uncertain Tax Positions	5	12	9
Energy Holdings [Member]
Income Taxes [Line Items]
Accumulated Interest and Penalties on Uncertain Tax Positions	$ 15	$ 13	$ 22