Leases Operating Lease Costs (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Operating Lease Costs
Long-term Lease Costs	$ 14	$ 36
Short-term Lease Costs	5	19
Variable Lease Costs	7	15
Total Operating Lease Costs	26	70
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 12	$ 31
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	$ 7	$ 16
Short-term Lease Costs	3	12
Variable Lease Costs	0	1
Total Operating Lease Costs	10	29
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 5	$ 12
Weighted Average Remaining Lease Term in Years	13 years	13 years
Weighted Average Discount Rate	3.60%	3.60%
PSEG Power [Member]
Operating Lease Costs
Long-term Lease Costs	$ 4	$ 9
Short-term Lease Costs	2	7
Variable Lease Costs	5	7
Total Operating Lease Costs	11	23
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 4	$ 8
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	$ 3	$ 11
Short-term Lease Costs	0	0
Variable Lease Costs	2	7
Total Operating Lease Costs	5	18
Cash Paid for Amounts Included in the Measurement of Operating Lease Liabilities	$ 3	$ 11
Weighted Average Remaining Lease Term in Years	11 years	11 years
Weighted Average Discount Rate	4.20%	4.20%