Leases Leases (Lease, Terms and Discount Rate) (Details)	Jun. 30, 2019
Operating Lease, Weighted Average Remaining Lease Term	5 years 5 months 1 day
Finance Lease, Weighted Average Remaining Lease Term	6 years 11 months 8 days
Operating Lease, Weighted Average Discount Rate, Percent	3.93%
Finance Lease, Weighted Average Discount Rate, Percent	4.71%
Entergy Arkansas [Member]
Operating Lease, Weighted Average Remaining Lease Term	6 years 2 months 19 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 6 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	3.79%
Finance Lease, Weighted Average Discount Rate, Percent	3.78%
Entergy Louisiana [Member]
Operating Lease, Weighted Average Remaining Lease Term	4 years 3 months 7 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 3 months 7 days
Operating Lease, Weighted Average Discount Rate, Percent	3.80%
Finance Lease, Weighted Average Discount Rate, Percent	3.78%
Entergy Mississippi [Member]
Operating Lease, Weighted Average Remaining Lease Term	5 years 1 month 9 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 5 months 1 day
Operating Lease, Weighted Average Discount Rate, Percent	3.80%
Finance Lease, Weighted Average Discount Rate, Percent	3.77%
Entergy New Orleans [Member]
Operating Lease, Weighted Average Remaining Lease Term	4 years 14 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 9 months 18 days
Operating Lease, Weighted Average Discount Rate, Percent	3.96%
Finance Lease, Weighted Average Discount Rate, Percent	3.95%
Entergy Texas [Member]
Operating Lease, Weighted Average Remaining Lease Term	4 years 6 months 7 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 2 months 23 days
Operating Lease, Weighted Average Discount Rate, Percent	3.93%
Finance Lease, Weighted Average Discount Rate, Percent	3.89%