Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Narrative) (Details) $ in Thousands	1 Months Ended			3 Months Ended
	May 31, 2021 USD ($)	Apr. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2021 USD ($)	May 01, 2021	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Amount of Facility			$ 3,500,000	$ 3,500,000
Amount Drawn/ Outstanding			$ 55,000	$ 55,000
Commercial Paper Program [Member]
Debt Instrument [Line Items]
Debt, weighted average interest rate			0.34%	0.34%
Commercial Paper program limit			$ 2,000,000	$ 2,000,000
Commercial Paper Amount Outstanding			1,028,000	1,028,000
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				1.63%
1.90% Series senior notes due June 2028
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			1.90%	1.90%
Amount			$ 650,000	$ 650,000
2.40% Series senior notes due June 2031
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			2.40%	2.40%
Amount			$ 650,000	$ 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			400	400
Entergy Arkansas [Member] | Revolving Credit Facility
Debt Instrument [Line Items]
Amount of Facility			150,000	150,000
Entergy Arkansas [Member] | Short-term revolving credit facility
Debt Instrument [Line Items]
Amount of Facility			$ 25,000	$ 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%	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			$ 200	$ 200		$ 300
Entergy Louisiana [Member] | 2.35% Series mortgage bonds due June 2032
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			2.35%	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%	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%	3.10%
Proceeds from Issuance of Debt			$ 500,000
Entergy Mississippi [Member]
Debt Instrument [Line Items]
Authorized Short Term Borrowings			175,000	$ 175,000
Letters of Credit Outstanding, Amount			400	400		200
Non-MISO letter of credit outstanding			$ 1,000	$ 1,000
Entergy Mississippi [Member] | 3.50% Series mortgage bonds due June 2051 [Member]
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			3.50%	3.50%
Proceeds from Issuance of Debt			$ 200,000
Entergy Mississippi [Member] | Revolving Credit Facility
Debt Instrument [Line Items]
Amount of Facility			82,500	$ 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						500
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
Letters of Credit Outstanding, Amount			100	100		$ 200
System Energy VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding			63,400	$ 63,400
Line of Credit Facility, Interest Rate During Period				1.23%
Line of credit facility commitment fee as a percentage of undrawn commitment amount				0.125%
Entergy Arkansas VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding			$ 4,800	$ 4,800
Line of Credit Facility, Interest Rate During Period				1.26%
Line of credit facility commitment fee as a percentage of undrawn commitment amount				0.125%
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			73,200	$ 73,200
Line of Credit Facility, Interest Rate During Period				1.25%
Line of credit facility commitment fee as a percentage of undrawn commitment amount				0.125%
Entergy Louisiana River Bend VIE [Member]
Debt Instrument [Line Items]
Amount Drawn/ Outstanding			$ 70,500	$ 70,500
Line of Credit Facility, Interest Rate During Period				1.24%
Line of credit facility commitment fee as a percentage of undrawn commitment amount				0.125%
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			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				1.21%
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				1.21%
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				1.58%
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				1.58%
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				1.58%
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				1.58%
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				1.36%
Subsequent Event [Member] | 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
Subsequent Event [Member] | 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
Subsequent Event [Member] | Entergy Louisiana [Member] | 3.375% Pollution contol refunding revenue bonds due 2028
Debt Instrument [Line Items]
Repayments of Debt		83,680
Subsequent Event [Member] | Entergy Louisiana [Member] | 3.50% Pollution control refunding revenue bond due 2030
Debt Instrument [Line Items]
Repayments of Debt		$ 115,000
Subsequent Event [Member] | 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
Credit Facility of Sixty Five Million [Member] | Entergy Mississippi [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			1,000	$ 1,000
Uncommitted Credit Facility			$ 65,000	$ 65,000