Leases Operating Lease Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Lease Income
Fixed Lease Income	$ 15	$ 22
Variable Lease Income	26	23
Total Operating Lease Income	41	45
PSEG Power LLC
Operating Lease Income
Fixed Lease Income	0	0
Variable Lease Income	26	23
Total Operating Lease Income	26	23
Other [Member]
Operating Lease Income
Fixed Lease Income	15	22
Variable Lease Income	0	0
Total Operating Lease Income	$ 15	$ 22