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