Leases Reconciliation of Undiscounted Cash Flows (Details) $ in Millions	Sep. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Total Minimum Lease Payments	$ 397
Reconciling Amount due to Discount Rate	(89)
Total Discounted Operating Lease Liabilities	308
Public Service Electric and Gas Company [Member]
Lessee, Lease, Description [Line Items]
Total Minimum Lease Payments	124
Reconciling Amount due to Discount Rate	(27)
Total Discounted Operating Lease Liabilities	97
PSEG Power [Member]
Lessee, Lease, Description [Line Items]
Total Minimum Lease Payments	102
Reconciling Amount due to Discount Rate	(29)
Total Discounted Operating Lease Liabilities	73
Other
Lessee, Lease, Description [Line Items]
Total Minimum Lease Payments	171
Reconciling Amount due to Discount Rate	(33)
Total Discounted Operating Lease Liabilities	$ 138