Asset Retirement Obligations (Difference Between Estimated Incurred Removal Costs And Estimated Removal Costs Recovered In Rates) (Details) - Removal Costs [Member] - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Entergy Arkansas [Member]
Asset Retirement Obligations [Line Items]
Regulatory Asset	$ 319.7	$ 267.1
Entergy Louisiana [Member]
Asset Retirement Obligations [Line Items]
Regulatory Asset	262.3	418.8
Entergy Mississippi [Member]
Asset Retirement Obligations [Line Items]
Regulatory Asset	188.0	159.4
Entergy New Orleans [Member]
Asset Retirement Obligations [Line Items]
Regulatory Asset	61.1	56.3
Entergy Texas [Member]
Asset Retirement Obligations [Line Items]
Regulatory Asset	77.5	62.9
System Energy [Member]
Asset Retirement Obligations [Line Items]
Regulatory Asset	$ 102.1	$ 94.4