Leases Operating Lease Costs (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Operating Lease Costs
Long-term Lease Costs	$ 12	$ 22
Short-term Lease Costs	7	14
Variable Lease Costs	5	8
Total Operating Lease Costs	24	44
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 9	$ 19
Weighted Average Remaining Lease Term in Years	12 years	12 years
Weighted Average Discount Rate	4.10%	4.10%
Public Service Electric and Gas Company [Member]
Operating Lease Costs
Long-term Lease Costs	$ 5	$ 9
Short-term Lease Costs	4	9
Variable Lease Costs	1	1
Total Operating Lease Costs	10	19
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 3	$ 7
Weighted Average Remaining Lease Term in Years	12 years	12 years
Weighted Average Discount Rate	3.70%	3.70%
PSEG Power [Member]
Operating Lease Costs
Long-term Lease Costs	$ 3	$ 5
Short-term Lease Costs	3	5
Variable Lease Costs	2	2
Total Operating Lease Costs	8	12
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 2	$ 4
Weighted Average Remaining Lease Term in Years	13 years	13 years
Weighted Average Discount Rate	4.40%	4.40%
Other
Operating Lease Costs
Long-term Lease Costs	$ 4	$ 8
Short-term Lease Costs	0	0
Variable Lease Costs	2	5
Total Operating Lease Costs	6	13
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 4	$ 8
Weighted Average Remaining Lease Term in Years	11 years	11 years
Weighted Average Discount Rate	4.20%	4.20%