Leases Reconciliation of Undiscounted Cash Flows (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Total Minimum Lease Payments	$ 366	$ 394
Reconciling Amount due to Discount Rate	(80)	(88)
Total Discounted Operating Lease Liabilities	286	306
Public Service Electric and Gas Company
Lessee, Lease, Description [Line Items]
Total Minimum Lease Payments	127	126
Reconciling Amount due to Discount Rate	(26)	(27)
Total Discounted Operating Lease Liabilities	101	99
PSEG Power LLC
Lessee, Lease, Description [Line Items]
Total Minimum Lease Payments	89	100
Reconciling Amount due to Discount Rate	(27)	(28)
Total Discounted Operating Lease Liabilities	62	72
Other
Lessee, Lease, Description [Line Items]
Total Minimum Lease Payments	150	168
Reconciling Amount due to Discount Rate	(27)	(33)
Total Discounted Operating Lease Liabilities	$ 123	$ 135