Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Short-term borrowings	$ 1,941,816	$ 1,941,816	$ 1,946,727
Amount of Facility	3,500,000	3,500,000
Letters of Credit Outstanding, Amount	6,000	6,000
Amount Drawn/ Outstanding	$ 922,000	$ 922,000
Commercial Paper Program [Member]
Debt Instrument [Line Items]
Debt, weighted average interest rate	2.02%	2.02%
Commercial Paper program limit	$ 2,000,000	$ 2,000,000
Commercial Paper Amount Outstanding	1,942,000	1,942,000
Credit Facility [Member]
Debt Instrument [Line Items]
Amount of Facility	3,500,000	3,500,000
Amount of total borrowing capacity against which fronting commitments exist	20,000	$ 20,000
Line of credit facility, commitment fee percentage		0.225%
Line of Credit Facility, Interest Rate During Period		2.99%
Entergy Arkansas [Member]
Debt Instrument [Line Items]
Authorized Short Term Borrowings	250,000	$ 250,000
Amount of total borrowing capacity against which fronting commitments exist	5,000	$ 5,000
Entergy Arkansas [Member] | 4.0% Series First Mortgage Bonds Due June 2028 [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 100,000
Debt instrument, interest rate, stated percentage	4.00%	4.00%
Entergy Louisiana [Member]
Debt Instrument [Line Items]
Authorized Short Term Borrowings	$ 450,000	$ 450,000
Amount of total borrowing capacity against which fronting commitments exist	15,000	$ 15,000
Repayments of Debt	100,000
Entergy Louisiana [Member] | Mortgage Bonds, Two Point Nine Zero Percent Series due March Twenty Fifty One [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 350,000
Debt instrument, interest rate, stated percentage	2.90%	2.90%
Entergy Louisiana [Member] | Mortgage Bonds, Four Point Two Zero Percent Series due September Twenty Forty Eight [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 300,000
Debt instrument, interest rate, stated percentage	4.20%	4.20%
Entergy Louisiana [Member] | Mortgage Bonds, Four Point Two Zero Percent Series due April Twenty Fifty [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.95%	3.95%
Repayments of Debt	$ 250,000
Entergy Mississippi [Member]
Debt Instrument [Line Items]
Authorized Short Term Borrowings	175,000	$ 175,000
Letters of Credit Outstanding, Amount	200	200	$ 200
Entergy Texas [Member]
Debt Instrument [Line Items]
Authorized Short Term Borrowings	200,000	200,000
Amount of total borrowing capacity against which fronting commitments exist	30,000	$ 30,000
Entergy Texas [Member] | Mortgage Bonds, Three Point Five Five Percent Series due September Twenty Forty Nine [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 175,000
Debt instrument, interest rate, stated percentage	3.55%	3.55%
Entergy Texas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Debt Instrument [Line Items]
Amount of Facility	$ 150,000	$ 150,000
Repayments of Debt	100,000
System Energy [Member]
Debt Instrument [Line Items]
Authorized Short Term Borrowings	200,000	200,000
Entergy New Orleans [Member]
Debt Instrument [Line Items]
Authorized Short Term Borrowings	150,000	150,000
Amount of total borrowing capacity against which fronting commitments exist	10,000	$ 10,000
Entergy New Orleans [Member] | Mortgage Bonds, Three Point Seven Five Percent Series due March Twenty Forty [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 62,000
Debt instrument, interest rate, stated percentage	3.75%	3.75%
Entergy New Orleans [Member] | Mortgage Bonds, Three Percent Series due March Twenty Twenty Five [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt	$ 78,000
Debt instrument, interest rate, stated percentage	3.00%	3.00%
System Energy VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	$ 88,300	$ 88,300
Line of Credit Facility, Interest Rate During Period		2.59%
Line of credit facility commitment fee as a percentage of undrawn commitment amount		0.10%
Line of Credit Facility, Expiration Date		Sep. 16, 2021
Entergy Arkansas VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	$ 43,800	$ 43,800
Line of Credit Facility, Interest Rate During Period		2.59%
Line of credit facility commitment fee as a percentage of undrawn commitment amount		0.10%
Line of Credit Facility, Expiration Date		Sep. 16, 2021
Entergy Arkansas VIE [Member] | Three Point Six Five Percent Series L Notes Due July Two Thousand Twenty One [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.65%	3.65%
Entergy Louisiana Waterford VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	$ 33,300	$ 33,300
Line of Credit Facility, Interest Rate During Period		2.69%
Line of credit facility commitment fee as a percentage of undrawn commitment amount		0.10%
Line of Credit Facility, Expiration Date		Sep. 16, 2021
Entergy Louisiana Waterford VIE [Member] | Three Point Nine Two Percent Series H Dues February Two Thousand Twenty One [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	3.92%	3.92%
Entergy Louisiana River Bend VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	$ 58,400	$ 58,400
Line of Credit Facility, Interest Rate During Period		2.69%
Line of credit facility commitment fee as a percentage of undrawn commitment amount		0.10%
Line of Credit Facility, Expiration Date		Sep. 16, 2021
Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage		0.225%
Consolidated debt ratio	0.65	0.65
Maximum [Member] | Entergy Arkansas [Member]
Debt Instrument [Line Items]
Consolidated debt ratio	0.65	0.65
Consolidated debt ratio of total capitalization		70.00%
Maximum [Member] | Entergy Louisiana [Member]
Debt Instrument [Line Items]
Consolidated debt ratio	0.65	0.65
Consolidated debt ratio of total capitalization		70.00%
Maximum [Member] | Entergy Mississippi [Member]
Debt Instrument [Line Items]
Consolidated debt ratio	0.65	0.65
Maximum [Member] | Entergy Texas [Member]
Debt Instrument [Line Items]
Consolidated debt ratio	0.65	0.65
Maximum [Member] | System Energy [Member]
Debt Instrument [Line Items]
Consolidated debt ratio of total capitalization		70.00%
Maximum [Member] | Entergy New Orleans [Member]
Debt Instrument [Line Items]
Consolidated debt ratio	0.65	0.65
Minimum [Member]
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage		0.075%
Credit Facility Of Twenty Million [Member] | Entergy Arkansas [Member]
Debt Instrument [Line Items]
Amount of Facility	$ 20,000	$ 20,000
Letters of Credit Outstanding, Amount	0	0
Amount Drawn/ Outstanding	0	$ 0
Line of Credit Facility, Interest Rate During Period		2.11%
Line of Credit Facility, Expiration Date		Apr. 30, 2021
Credit Facility Of Three Hundred Fifty Million [Member] | Entergy Louisiana [Member]
Debt Instrument [Line Items]
Amount of Facility	350,000	$ 350,000
Letters of Credit Outstanding, Amount	0	0
Amount Drawn/ Outstanding	0	$ 0
Line of Credit Facility, Interest Rate During Period		2.11%
Line of Credit Facility, Expiration Date		Sep. 14, 2024
Credit Facility Of One Hundred And Fifty Million [Member] | Entergy Arkansas [Member]
Debt Instrument [Line Items]
Amount of Facility	150,000	$ 150,000
Letters of Credit Outstanding, Amount	0	0
Amount Drawn/ Outstanding	0	$ 0
Line of Credit Facility, Interest Rate During Period		2.11%
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]
Amount of Facility	150,000	$ 150,000
Letters of Credit Outstanding, Amount	1,300	1,300
Amount Drawn/ Outstanding	0	$ 0
Line of Credit Facility, Interest Rate During Period		2.49%
Line of Credit Facility, Expiration Date		Sep. 14, 2024
Credit Facility Of Thirty Seven Point Five Million [Member] | Entergy Mississippi [Member]
Debt Instrument [Line Items]
Amount of Facility	37,500	$ 37,500
Letters of Credit Outstanding, Amount	0	0
Amount Drawn/ Outstanding	0	$ 0
Line of Credit Facility, Interest Rate During Period		2.49%
Line of Credit Facility, Expiration Date		Apr. 30, 2021
Credit Facility Of Thirty Five Million [Member] | Entergy Mississippi [Member]
Debt Instrument [Line Items]
Amount of Facility	35,000	$ 35,000
Letters of Credit Outstanding, Amount	0	0
Amount Drawn/ Outstanding	0	$ 0
Line of Credit Facility, Interest Rate During Period		2.49%
Line of Credit Facility, Expiration Date		Apr. 30, 2021
Credit Facility Of Ten Million [Member] | Entergy Mississippi [Member]
Debt Instrument [Line Items]
Amount of Facility	10,000	$ 10,000
Letters of Credit Outstanding, Amount	0	0
Amount Drawn/ Outstanding	0	$ 0
Line of Credit Facility, Interest Rate During Period		2.49%
Line of Credit Facility, Expiration Date		Apr. 30, 2021
Credit Facility Of Twenty Five Million [Member] | Entergy New Orleans [Member]
Debt Instrument [Line Items]
Amount of Facility	25,000	$ 25,000
Letters of Credit Outstanding, Amount	800	800
Amount Drawn/ Outstanding	$ 0	$ 0
Line of Credit Facility, Interest Rate During Period		2.26%
Line of Credit Facility, Expiration Date		Nov. 20, 2021