Leases Leases (Lease, Terms and Discount Rate) (Details)	Mar. 31, 2019
Operating Lease, Weighted Average Remaining Lease Term	5 years 185 days
Finance Lease, Weighted Average Remaining Lease Term	7 years 22 days
Operating Lease, Weighted Average Discount Rate, Percent	3.75%
Finance Lease, Weighted Average Discount Rate, Percent	4.64%
Entergy Arkansas [Member]
Operating Lease, Weighted Average Remaining Lease Term	6 years 139 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 234 days
Operating Lease, Weighted Average Discount Rate, Percent	3.29%
Finance Lease, Weighted Average Discount Rate, Percent	3.71%
Entergy Louisiana [Member]
Operating Lease, Weighted Average Remaining Lease Term	4 years 117 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 106 days
Operating Lease, Weighted Average Discount Rate, Percent	3.54%
Finance Lease, Weighted Average Discount Rate, Percent	3.56%
Entergy Mississippi [Member]
Operating Lease, Weighted Average Remaining Lease Term	5 years 33 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 142 days
Operating Lease, Weighted Average Discount Rate, Percent	3.67%
Finance Lease, Weighted Average Discount Rate, Percent	3.70%
Entergy New Orleans [Member]
Operating Lease, Weighted Average Remaining Lease Term	5 years 234 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 296 days
Operating Lease, Weighted Average Discount Rate, Percent	3.55%
Finance Lease, Weighted Average Discount Rate, Percent	3.97%
Entergy Texas [Member]
Operating Lease, Weighted Average Remaining Lease Term	4 years 55 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 33 days
Operating Lease, Weighted Average Discount Rate, Percent	3.80%
Finance Lease, Weighted Average Discount Rate, Percent	3.72%