Leases Lease, Terms and Discount Rate (Details)	Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Weighted Average Remaining Lease Term	4 years 9 months 25 days	5 years 1 month 20 days
Finance Lease, Weighted Average Remaining Lease Term	6 years 4 months 2 days	6 years 8 months 8 days
Operating Lease, Weighted Average Discount Rate, Percent	3.58%	3.86%
Finance Lease, Weighted Average Discount Rate, Percent	4.42%	4.60%
Entergy Louisiana [Member]
Operating Lease, Weighted Average Remaining Lease Term	4 years 8 months 19 days	4 years 3 months 29 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 2 months 12 days	5 years 2 months 26 days
Operating Lease, Weighted Average Discount Rate, Percent	3.11%	3.65%
Finance Lease, Weighted Average Discount Rate, Percent	3.33%	3.65%
Entergy Mississippi [Member]
Operating Lease, Weighted Average Remaining Lease Term	5 years 3 months 18 days	5 years 14 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 5 months 8 days	5 years 3 months 25 days
Operating Lease, Weighted Average Discount Rate, Percent	3.43%	3.75%
Finance Lease, Weighted Average Discount Rate, Percent	3.22%	3.67%
Entergy New Orleans [Member]
Operating Lease, Weighted Average Remaining Lease Term	5 years 9 months 10 days	5 years 7 months 13 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 8 months 8 days	5 years 11 months 4 days
Operating Lease, Weighted Average Discount Rate, Percent	3.09%	3.88%
Finance Lease, Weighted Average Discount Rate, Percent	3.35%	3.74%
Entergy Texas [Member]
Operating Lease, Weighted Average Remaining Lease Term	4 years 3 months 18 days	4 years 6 months 14 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 4 months 20 days	5 years 1 month 13 days
Operating Lease, Weighted Average Discount Rate, Percent	3.07%	3.73%
Finance Lease, Weighted Average Discount Rate, Percent	3.22%	3.82%
Entergy Arkansas [Member]
Operating Lease, Weighted Average Remaining Lease Term	5 years 8 months 26 days	5 years 10 months 2 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 7 months 6 days	5 years 5 months 4 days
Operating Lease, Weighted Average Discount Rate, Percent	3.34%	3.67%
Finance Lease, Weighted Average Discount Rate, Percent	3.18%	3.68%