Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Short-term borrowings	$ 1,627,489	$ 1,946,727
Line of credit facility, maximum borrowing capacity	3,500,000
Amount of total borrowing capacity against which fronting commitments exist	$ 20,000
Line of credit facility, commitment fee percentage	0.225%
Amount Drawn/ Outstanding	$ 165,000
Consolidated debt ratio	65.00%
Commercial Paper program limit	$ 2,000,000
Commercial Paper Amount Outstanding	1,627,000
Entergy Mississippi [Member]
Debt Instrument [Line Items]
Letters of credit posted to cover derivative exposure	200
Entergy New Orleans [Member]
Debt Instrument [Line Items]
Amount of total borrowing capacity against which fronting commitments exist	10,000
Letters of credit posted to cover derivative exposure	200
Entergy Nuclear Vermont Yankee [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 139,000
Line of credit facility, commitment fee percentage	0.20%
Amount Drawn/ Outstanding	$ 139,000
Debt, weighted average interest rate	2.46%
Entergy Arkansas [Member]
Debt Instrument [Line Items]
Amount of total borrowing capacity against which fronting commitments exist	$ 5,000
Entergy Texas [Member]
Debt Instrument [Line Items]
Amount of total borrowing capacity against which fronting commitments exist	30,000
Letters of credit posted to cover derivative exposure	500
Entergy Louisiana [Member]
Debt Instrument [Line Items]
Amount of total borrowing capacity against which fronting commitments exist	15,000
Letters of credit posted to cover derivative exposure	300
Entergy Louisiana Waterford VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	$ 39,300
Line of credit facility commitment fee as a percentage of undrawn commitment amount	0.125%
Line of Credit Facility, Expiration Date	Sep. 16, 2022
Entergy Louisiana River Bend VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	$ 18,900
Line of credit facility commitment fee as a percentage of undrawn commitment amount	0.125%
Line of Credit Facility, Expiration Date	Sep. 16, 2022
System Energy VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	$ 0
Line of credit facility commitment fee as a percentage of undrawn commitment amount	0.125%
Line of Credit Facility, Expiration Date	Sep. 16, 2022
Entergy Arkansas VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	$ 12,200
Line of credit facility commitment fee as a percentage of undrawn commitment amount	0.125%
Line of Credit Facility, Expiration Date	Sep. 16, 2022
Credit Facility [Member]
Debt Instrument [Line Items]
Debt, weighted average interest rate	2.35%
Commercial Paper Program [Member]
Debt Instrument [Line Items]
Debt, weighted average interest rate	1.39%
Three Point Nine Two Percent Series H Dues February Two Thousand Twenty One [Member] | Entergy Louisiana Waterford VIE [Member]
Debt Instrument [Line Items]
Notes payable noncurrent amount	$ 40,000
Debt Instrument, Interest Rate, Stated Percentage	3.92%
Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage	0.275%
Maximum [Member] | Entergy Mississippi [Member]
Debt Instrument [Line Items]
Consolidated debt ratio	65.00%
Maximum [Member] | Entergy New Orleans [Member]
Debt Instrument [Line Items]
Consolidated debt ratio	65.00%
Maximum [Member] | System Energy [Member]
Debt Instrument [Line Items]
Consolidated debt ratio	65.00%
Consolidated debt ratio of lessees total capitalization	70.00%
Maximum [Member] | Entergy Arkansas [Member]
Debt Instrument [Line Items]
Consolidated debt ratio	65.00%
Consolidated debt ratio of lessees total capitalization	70.00%
Maximum [Member] | Entergy Texas [Member]
Debt Instrument [Line Items]
Consolidated debt ratio	65.00%
Maximum [Member] | Entergy Louisiana [Member]
Debt Instrument [Line Items]
Consolidated debt ratio	65.00%
Consolidated debt ratio of lessees total capitalization	70.00%
Minimum [Member]
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage	0.075%
Credit Facility Of Thirty Seven Point Five Million [Member] | Entergy Mississippi [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 37,500
Amount Drawn/ Outstanding	0
Letters of Credit Outstanding, Amount	$ 0
Line of Credit Facility, Expiration Date	Apr. 30, 2021
Credit Facility Of Thirty Five Million [Member] | Entergy Mississippi [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 35,000
Amount Drawn/ Outstanding	0
Letters of Credit Outstanding, Amount	$ 0
Line of Credit Facility, Expiration Date	Apr. 30, 2021
Credit Facility Of Ten Million [Member] | Entergy Mississippi [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 10,000
Amount Drawn/ Outstanding	0
Letters of Credit Outstanding, Amount	$ 0
Line of Credit Facility, Expiration Date	Apr. 30, 2021
Credit Facility Of Twenty Five Million [Member] | Entergy New Orleans [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 25,000
Amount Drawn/ Outstanding	0
Letters of Credit Outstanding, Amount	$ 800
Line of Credit Facility, Expiration Date	Nov. 20, 2021
Credit Facility Of Twenty Five Million [Member] | Entergy Arkansas [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 25,000
Amount Drawn/ Outstanding	0
Letters of Credit Outstanding, Amount	$ 0
Line of Credit Facility, Expiration Date	Apr. 30, 2021
Credit Facility Of One Hundred And Fifty Million [Member] | Entergy Arkansas [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 150,000
Amount Drawn/ Outstanding	0
Letters of Credit Outstanding, Amount	$ 0
Line of Credit Facility, Expiration Date	Sep. 14, 2024
Credit Facility Of One Hundred And Fifty Million [Member] | Entergy Texas [Member]
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 150,000
Amount Drawn/ Outstanding	0
Letters of Credit Outstanding, Amount	$ 1,300
Line of Credit Facility, Expiration Date	Sep. 14, 2024
Credit Facility Of Three Hundred Fifty Million [Member] | Entergy Louisiana [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Expiration Date	Sep. 14, 2024