Early Plant Retirements Early Plant Retirements (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Mar. 31, 2020
Restructuring Cost and Reserve [Line Items]
Gain (Loss) on Disposition of Assets		$ (402,000,000)	$ 54,000,000	$ 0
Assets Held for Sale		30,000,000	0
PSEG Power LLC
Restructuring Cost and Reserve [Line Items]
ZEC Charge per kwh		0.004
ZEC Charge per MWh		10
Gain on Sale of Hudson and Mercer			54,000,000
Gain (Loss) on Disposition of Assets	$ (400,000,000)	(402,000,000)	54,000,000	0
Assets Held for Sale		$ 28,000,000	$ 0
PSEG Power LLC | Depreciation And Amortization [Member]
Restructuring Cost and Reserve [Line Items]
Depreciation, including Asset Retirement Costs				$ 964,000,000
Subsequent Event [Member]
Restructuring Cost and Reserve [Line Items]
Assets Held for Sale					$ 160,000,000