Income Taxes (Summary of net regulatory liabilities for income taxes related to Tax Cuts and Jobs Act) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Entergy Arkansas [Member]
Net Regulatory Liabilities for Income Taxes	$ 423	$ 418
Entergy Louisiana [Member]
Net Regulatory Liabilities for Income Taxes	313	355
Entergy Mississippi [Member]
Net Regulatory Liabilities for Income Taxes	171	181
Entergy New Orleans [Member]
Net Regulatory Liabilities for Income Taxes	16	15
Entergy Texas [Member]
Net Regulatory Liabilities for Income Taxes	58	94
System Energy [Member]
Net Regulatory Liabilities for Income Taxes	$ 100	$ 105