Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Narrative) (Details) $ in Thousands	1 Months Ended				6 Months Ended
	Jun. 30, 2021 USD ($)	May 31, 2021 USD ($)	Apr. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	May 01, 2021	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Amount of Facility	$ 3,500,000				$ 3,500,000
Amount Drawn/ Outstanding	$ 150,000				$ 150,000
Commercial Paper Program [Member]
Debt Instrument [Line Items]
Debt, weighted average interest rate	0.32%				0.32%
Commercial Paper program limit	$ 2,000,000				$ 2,000,000
Commercial Paper Amount Outstanding	866,000				866,000
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					1.61%
1.90% Series senior notes due June 2028
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				1.90%
Amount				$ 650,000
2.40% Series senior notes due June 2031
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.40%
Amount				$ 650,000
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
Letters of Credit Outstanding, Amount	1,500				1,500
Entergy Arkansas [Member] | Revolving Credit Facility
Debt Instrument [Line Items]
Amount of Facility				150,000
Entergy Arkansas [Member] | Short-term revolving credit facility
Debt Instrument [Line Items]
Amount of Facility				$ 25,000
Entergy Arkansas [Member] | 3.35% Series mortgage bonds due June 2052
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				3.35%
Proceeds from Issuance of Debt				$ 400,000
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
Letters of Credit Outstanding, Amount	700				700		$ 300
Entergy Louisiana [Member] | 2.35% Series mortgage bonds due June 2032
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				2.35%
Proceeds from Issuance of Debt				$ 500,000
Entergy Louisiana [Member] | 4.80% Series mortgage bonds due May 2021
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				4.80%
Repayments of Debt				$ 200,000
Entergy Louisiana [Member] | 3.10% Series mortgage bonds due June 2041
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				3.10%
Proceeds from Issuance of Debt				$ 500,000
Entergy Louisiana [Member] | 2.00% pollution control refunding revenue bonds due June 2030
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			2.00%
Proceeds from Issuance of Debt			$ 16,200
Entergy Louisiana [Member] | 2.50% pollution control refunding revenue bonds due April 2036
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			2.50%
Proceeds from Issuance of Debt			$ 182,480
Entergy Louisiana [Member] | 3.375% Pollution contol refunding revenue bonds due 2028
Debt Instrument [Line Items]
Repayments of Debt			83,680
Entergy Louisiana [Member] | 3.50% Pollution control refunding revenue bond due 2030
Debt Instrument [Line Items]
Repayments of Debt			$ 115,000
Entergy Mississippi [Member]
Debt Instrument [Line Items]
Authorized Short Term Borrowings	175,000				175,000
Letters of Credit Outstanding, Amount	900				900		200
Non-MISO letter of credit outstanding	7,900				7,900
Entergy Mississippi [Member] | 3.50% Series mortgage bonds due June 2051 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage				3.50%
Proceeds from Issuance of Debt				$ 200,000
Entergy Mississippi [Member] | Revolving Credit Facility
Debt Instrument [Line Items]
Amount of Facility				$ 82,500
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
Letters of Credit Outstanding, Amount	2,300				2,300		500
Entergy Texas [Member] | 2.55% Series mortgage bonds due June 2021 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage						2.55%
Repayments of Debt		$ 125,000
System Energy [Member]
Debt Instrument [Line Items]
Authorized Short Term Borrowings	$ 200,000				$ 200,000
System Energy [Member] | 2.375% refunding revenue bonds due June 2044
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.375%				2.375%
Proceeds from Issuance of Debt	$ 83,695
System Energy [Member] | Outstanding revenue bonds
Debt Instrument [Line Items]
Repayments of Debt	83,695
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
Letters of Credit Outstanding, Amount	300				300		$ 200
System Energy VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	45,700				$ 45,700
Line of Credit Facility, Interest Rate During Period					1.22%
Line of credit facility commitment fee as a percentage of undrawn commitment amount					0.10%
Entergy Arkansas VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	$ 0				$ 0
Line of Credit Facility, Interest Rate During Period					1.26%
Line of credit facility commitment fee as a percentage of undrawn commitment amount					0.10%
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%
Amount	$ 90,000				$ 90,000
Entergy Louisiana Waterford VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	62,100				$ 62,100
Line of Credit Facility, Interest Rate During Period					1.22%
Line of credit facility commitment fee as a percentage of undrawn commitment amount					0.10%
Entergy Louisiana River Bend VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding	64,600				$ 64,600
Line of Credit Facility, Interest Rate During Period					1.22%
Line of credit facility commitment fee as a percentage of undrawn commitment amount					0.10%
Entergy Nuclear Vermont Yankee
Debt Instrument [Line Items]
Amount of Facility	139,000				$ 139,000
Amount Drawn/ Outstanding	$ 139,000				$ 139,000
Debt, weighted average interest rate	1.71%				1.71%
Line of credit facility commitment fee as a percentage of undrawn commitment amount					0.20%
Maximum [Member]
Debt Instrument [Line Items]
Line of credit facility, commitment fee percentage					0.275%
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	0.65				0.65
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 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					1.23%
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					1.23%
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					1.60%
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					1.60%
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					1.60%
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					1.60%
Credit Facility Of Twenty Five Million [Member] | Entergy Arkansas [Member]
Debt Instrument [Line Items]
Amount of Facility	25,000				$ 25,000
Letters of Credit Outstanding, Amount	0				0
Amount Drawn/ Outstanding	0				$ 0
Line of Credit Facility, Interest Rate During Period					2.75%
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	0				0
Amount Drawn/ Outstanding	0				$ 0
Line of Credit Facility, Interest Rate During Period					1.58%
Credit Facility of Sixty Five Million [Member] | Entergy Mississippi [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	2,000				$ 2,000
Uncommitted Credit Facility	$ 65,000				$ 65,000