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