Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Summary Of The Borrowings Outstanding And Capacity Available Under The Facility) (Details) - USD ($) $ in Millions	Apr. 30, 2022	Mar. 31, 2022
Summary of the borrowings outstanding and capacity available under the facility
Capacity		$ 3,500
Amount Drawn/ Outstanding		150
Letters of Credit		3
Capacity Available		3,347
Line of Credit Facility [Line Items]
Amount of Facility		3,500
Credit Facility [Member]
Summary of the borrowings outstanding and capacity available under the facility
Capacity		3,500
Line of Credit Facility [Line Items]
Amount of Facility		3,500
Entergy Mississippi [Member] | Subsequent Event [Member]
Summary of the borrowings outstanding and capacity available under the facility
Capacity	$ 95
Line of Credit Facility [Line Items]
Amount of Facility	95
Credit Facility Of Thirty Five Million [Member] | Entergy Mississippi [Member]
Summary of the borrowings outstanding and capacity available under the facility
Capacity		35
Amount Drawn/ Outstanding		0
Line of Credit Facility [Line Items]
Amount of Facility		$ 35
Credit Facility Of One Hundred And Fifty Million [Member] | Entergy Mississippi [Member] | Subsequent Event [Member]
Summary of the borrowings outstanding and capacity available under the facility
Capacity	150
Line of Credit Facility [Line Items]
Amount of Facility	$ 150