Leases (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) renewals	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Lessor leases carrying value	$ 297
Public Service Electric and Gas Company
Lessee, Lease, Description [Line Items]
Number of lease renewal terms	5
Operating lease liabilities, current	$ 13	$ 12
PSEG Power LLC
Lessee, Lease, Description [Line Items]
Number of lease renewal terms | renewals	7
Operating lease liabilities, current	$ 11	10
Lessor leases carrying value	$ 376
PSEG Power LLC | Minimum
Lessee, Lease, Description [Line Items]
Lease renewal term	15 years
PSEG Power LLC | Maximum
Lessee, Lease, Description [Line Items]
Lease renewal term	20 years
PSEG
Lessee, Lease, Description [Line Items]
Operating lease liabilities, current	$ 34	$ 33
Services | Subsidiaries
Lessee, Lease, Description [Line Items]
Number of lease renewal terms	2
Energy Holdings | Subsidiaries
Lessee, Lease, Description [Line Items]
Lessor leases carrying value	$ 83