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Income Taxes (Summary of Accrued Balances for Possible Payment of Interest Related to Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Unrecognized Tax Benefits, Interest on Income Taxes Accrued $ 42.0 $ 32.0 $ 39.0
Unrecognized Tax Benefits, Interest on Income Taxes Expense 10.0 (7.0) (11.0)
Entergy Arkansas [Member]      
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 9.5 8.4 7.8
Unrecognized Tax Benefits, Interest on Income Taxes Expense 1.1 0.6 3.5
Entergy Louisiana [Member]      
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 13.7 5.1 1.5
Unrecognized Tax Benefits, Interest on Income Taxes Expense 8.6 3.6 (2.6)
Entergy Mississippi [Member]      
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 4.5 3.2 2.1
Unrecognized Tax Benefits, Interest on Income Taxes Expense 1.3 1.1 (1.0)
Entergy New Orleans [Member]      
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 1.9 0.6 0.6
Unrecognized Tax Benefits, Interest on Income Taxes Expense 1.3 0.0 (5.8)
Entergy Texas [Member]      
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 1.3 0.5 0.0
Unrecognized Tax Benefits, Interest on Income Taxes Expense 0.8 0.5 (1.1)
System Energy [Member]      
Unrecognized Tax Benefits, Interest on Income Taxes Accrued 2.3 2.9 1.9
Unrecognized Tax Benefits, Interest on Income Taxes Expense $ (0.6) $ 1.0 $ 0.0