Leases Leases (Lease, Terms and Discount Rate) (Details)	Sep. 30, 2019
Operating Lease, Weighted Average Remaining Lease Term	5 years 1 month 6 days
Finance Lease, Weighted Average Remaining Lease Term	6 years 9 months 14 days
Operating Lease, Weighted Average Discount Rate, Percent	3.91%
Finance Lease, Weighted Average Discount Rate, Percent	4.67%
Entergy Arkansas [Member]
Operating Lease, Weighted Average Remaining Lease Term	6 years 1 month 2 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 5 months 8 days
Operating Lease, Weighted Average Discount Rate, Percent	3.75%
Finance Lease, Weighted Average Discount Rate, Percent	3.75%
Entergy Louisiana [Member]
Operating Lease, Weighted Average Remaining Lease Term	4 years 3 months 10 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 4 months 28 days
Operating Lease, Weighted Average Discount Rate, Percent	3.74%
Finance Lease, Weighted Average Discount Rate, Percent	3.75%
Entergy Mississippi [Member]
Operating Lease, Weighted Average Remaining Lease Term	4 years 7 months 24 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 4 months 28 days
Operating Lease, Weighted Average Discount Rate, Percent	3.77%
Finance Lease, Weighted Average Discount Rate, Percent	3.71%
Entergy New Orleans [Member]
Operating Lease, Weighted Average Remaining Lease Term	3 years 11 months 26 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 8 months 19 days
Operating Lease, Weighted Average Discount Rate, Percent	3.94%
Finance Lease, Weighted Average Discount Rate, Percent	3.93%
Entergy Texas [Member]
Operating Lease, Weighted Average Remaining Lease Term	4 years 5 months 26 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 3 months
Operating Lease, Weighted Average Discount Rate, Percent	3.86%
Finance Lease, Weighted Average Discount Rate, Percent	3.84%