Leases Lease, Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Finance Lease, Liability, Current	$ 11,921	$ 11,413
Finance Lease, Liability, Noncurrent	$ 52,803	$ 53,396
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%
Other Current Liabilities [Member]
Operating Lease, Liability, Current	$ 59,004	$ 52,678
Other Non-Current Liabilities [Member]
Operating Lease, Liability, Noncurrent	170,980	181,339
Entergy Louisiana [Member]
Operating Lease, Liability, Current	11,934	10,331
Finance Lease, Liability, Current	3,821	3,919
Operating Lease, Liability, Noncurrent	31,260	25,743
Finance Lease, Liability, Noncurrent	$ 12,603	$ 13,376
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, Liability, Current	$ 5,738	$ 5,633
Finance Lease, Liability, Current	1,644	1,487
Operating Lease, Liability, Noncurrent	10,867	11,232
Finance Lease, Liability, Noncurrent	$ 5,808	$ 5,382
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, Liability, Current	$ 1,406	$ 1,134
Finance Lease, Liability, Current	686	647
Operating Lease, Liability, Noncurrent	3,819	2,746
Finance Lease, Liability, Noncurrent	$ 2,741	$ 2,644
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, Liability, Current	$ 4,277	$ 3,698
Finance Lease, Liability, Current	1,327	1,222
Operating Lease, Liability, Noncurrent	10,469	10,364
Finance Lease, Liability, Noncurrent	$ 4,392	$ 4,009
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, Liability, Current	$ 11,942	$ 11,443
Finance Lease, Liability, Current	2,660	2,442
Operating Lease, Liability, Noncurrent	43,914	40,880
Finance Lease, Liability, Noncurrent	$ 9,788	$ 8,768
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%