Leases Operating Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Year One	$ 45
Lessee, Operating Lease, Liability, to be Paid, Year Two	42
Lessee, Operating Lease, Liability, to be Paid, Year Three	34
Lessee, Operating Lease, Liability, to be Paid, Year Four	28
Lessee, Operating Lease, Liability, to be Paid, Year Five	26
Lessee, Operating Lease, Liability, to be Paid, after Year Five	191
Total Minimum Lease Payments	366	$ 394
Public Service Electric and Gas Company
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Year One	16
Lessee, Operating Lease, Liability, to be Paid, Year Two	13
Lessee, Operating Lease, Liability, to be Paid, Year Three	11
Lessee, Operating Lease, Liability, to be Paid, Year Four	10
Lessee, Operating Lease, Liability, to be Paid, Year Five	8
Lessee, Operating Lease, Liability, to be Paid, after Year Five	69
Total Minimum Lease Payments	127	126
PSEG Power LLC
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Year One	14
Lessee, Operating Lease, Liability, to be Paid, Year Two	14
Lessee, Operating Lease, Liability, to be Paid, Year Three	8
Lessee, Operating Lease, Liability, to be Paid, Year Four	3
Lessee, Operating Lease, Liability, to be Paid, Year Five	3
Lessee, Operating Lease, Liability, to be Paid, after Year Five	47
Total Minimum Lease Payments	89	100
Other
Lessee, Operating Lease, Liability, Payment, Due [Abstract]
Lessee, Operating Lease, Liability, to be Paid, Year One	15
Lessee, Operating Lease, Liability, to be Paid, Year Two	15
Lessee, Operating Lease, Liability, to be Paid, Year Three	15
Lessee, Operating Lease, Liability, to be Paid, Year Four	15
Lessee, Operating Lease, Liability, to be Paid, Year Five	15
Lessee, Operating Lease, Liability, to be Paid, after Year Five	75
Total Minimum Lease Payments	$ 150	$ 168