Leases Operating Lease Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Lease Costs
Long-term Lease Costs	$ 54	$ 52
Short-term Lease Costs	45	24
Variable Lease Costs	31	22
Total Operating Lease Costs	130	98
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 45	$ 42
Weighted Average Remaining Lease Term in Years	11 years	12 years
Weighted Average Discount Rate	4.00%	4.10%
Public Service Electric and Gas Company
Operating Lease Costs
Long-term Lease Costs	$ 26	$ 24
Short-term Lease Costs	38	14
Variable Lease Costs	2	2
Total Operating Lease Costs	66	40
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 17	$ 16
Weighted Average Remaining Lease Term in Years	12 years	13 years
Weighted Average Discount Rate	3.50%	3.60%
PSEG Power LLC
Operating Lease Costs
Long-term Lease Costs	$ 14	$ 13
Short-term Lease Costs	7	10
Variable Lease Costs	20	10
Total Operating Lease Costs	41	33
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 14	$ 11
Weighted Average Remaining Lease Term in Years	14 years	14 years
Weighted Average Discount Rate	4.50%	4.40%
Other
Operating Lease Costs
Long-term Lease Costs	$ 14	$ 15
Short-term Lease Costs	0	0
Variable Lease Costs	9	10
Total Operating Lease Costs	23	25
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 14	$ 15
Weighted Average Remaining Lease Term in Years	10 years	10 years
Weighted Average Discount Rate	4.20%	4.20%