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, 2021	Dec. 31, 2020
Entergy Arkansas [Member]
Asset Retirement Obligations [Line Items]
Regulatory Assets	$ 224.3	$ 212.6
Entergy Louisiana [Member]
Asset Retirement Obligations [Line Items]
Regulatory Assets	848.2	302.5
Entergy Mississippi [Member]
Asset Retirement Obligations [Line Items]
Regulatory Assets	136.8	107.3
Entergy New Orleans [Member]
Asset Retirement Obligations [Line Items]
Regulatory Assets	91.7	63.2
Entergy Texas [Member]
Asset Retirement Obligations [Line Items]
Regulatory Assets	98.1	115.3
System Energy [Member]
Asset Retirement Obligations [Line Items]
Regulatory Assets	$ 89.7	$ 92.9