Income Taxes (Interest And Penalties Related To Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Accumulated Interest and Penalties on Uncertain Tax Positions	$ 40	$ 43	$ 70
Public Service Electric and Gas Company
Income Taxes [Line Items]
Accumulated Interest and Penalties on Uncertain Tax Positions	16	12	25
PSEG Power LLC
Income Taxes [Line Items]
Accumulated Interest and Penalties on Uncertain Tax Positions	12	9	24
Energy Holdings [Member]
Income Taxes [Line Items]
Accumulated Interest and Penalties on Uncertain Tax Positions	$ 13	$ 22	$ 21