Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2020	Jan. 29, 2021	Jun. 30, 2020
Document Transition Report	false
Entity File Number	1-11299
Document Quarterly Report	true
Entity Registrant Name	ENTERGY CORPORATION
Entity Central Index Key	0000065984
Document Type	10-K
Document Period End Date	Dec. 31, 2020
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	639 Loyola Avenue
Entity Address, City or Town	New Orleans
Entity Address, State or Province	LA
Entity Address, Postal Zip Code	70113
City Area Code	504
Local Phone Number	576-4000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Public Float			$ 18.8
Entity Common Stock, Shares Outstanding		200,479,995
Entity Tax Identification Number	72-1229752
ICFR Auditor Attestation Flag	true
Entergy Arkansas [Member]
Entity File Number	1-10764
Entity Registrant Name	ENTERGY ARKANSAS, LLC
Entity Central Index Key	0000007323
Entity Incorporation, State or Country Code	TX
Entity Address, Address Line One	425 West Capitol Avenue
Entity Address, City or Town	Little Rock
Entity Address, State or Province	AR
Entity Address, Postal Zip Code	72201
City Area Code	501
Local Phone Number	377-4000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Tax Identification Number	83-1918668
ICFR Auditor Attestation Flag
Entergy Louisiana [Member]
Entity File Number	1-32718
Entity Registrant Name	ENTERGY LOUISIANA, LLC
Entity Central Index Key	0001348952
Entity Incorporation, State or Country Code	TX
Entity Address, Address Line One	4809 Jefferson Highway
Entity Address, City or Town	Jefferson
Entity Address, State or Province	LA
Entity Address, Postal Zip Code	70121
City Area Code	504
Local Phone Number	576-4000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Tax Identification Number	47-4469646
ICFR Auditor Attestation Flag
Entergy Mississippi [Member]
Entity File Number	1-31508
Entity Registrant Name	ENTERGY MISSISSIPPI, LLC
Entity Central Index Key	0000066901
Entity Incorporation, State or Country Code	TX
Entity Address, Address Line One	308 East Pearl Street
Entity Address, City or Town	Jackson
Entity Address, State or Province	MS
Entity Address, Postal Zip Code	39201
City Area Code	601
Local Phone Number	368-5000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Tax Identification Number	83-1950019
ICFR Auditor Attestation Flag
Entergy New Orleans [Member]
Entity File Number	1-35747
Entity Registrant Name	ENTERGY NEW ORLEANS, LLC
Entity Central Index Key	0000071508
Entity Incorporation, State or Country Code	TX
Entity Address, Address Line One	1600 Perdido Street
Entity Address, City or Town	New Orleans
Entity Address, State or Province	LA
Entity Address, Postal Zip Code	70112
City Area Code	504
Local Phone Number	670-3700
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Tax Identification Number	82-2212934
ICFR Auditor Attestation Flag
Entergy Texas [Member]
Title of 12(g) Security	Common Stock, no par value
Entity File Number	1-34360
Entity Registrant Name	ENTERGY TEXAS, INC.
Entity Central Index Key	0001427437
Entity Incorporation, State or Country Code	TX
Entity Address, Address Line One	10055 Grogans Mill Road
Entity Address, City or Town	The Woodlands
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77380
City Area Code	409
Local Phone Number	981-2000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Tax Identification Number	61-1435798
ICFR Auditor Attestation Flag
System Energy [Member]
Entity File Number	1-09067
Entity Registrant Name	SYSTEM ENERGY RESOURCES, INC.
Entity Central Index Key	0000202584
Entity Incorporation, State or Country Code	AR
Entity Address, Address Line One	1340 Echelon Parkway
Entity Address, City or Town	Jackson
Entity Address, State or Province	MS
Entity Address, Postal Zip Code	39213
City Area Code	601
Local Phone Number	368-5000
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Tax Identification Number	72-0752777
ICFR Auditor Attestation Flag
NEW YORK STOCK EXCHANGE, INC. [Member]
Title of 12(b) Security	Common Stock, $0.01 Par Value
Trading Symbol	ETR
Security Exchange Name	NYSE
CHICAGO STOCK EXCHANGE, INC [Member]
Title of 12(b) Security	Common Stock, $0.01 Par Value
Trading Symbol	ETR
Security Exchange Name	CHX
Four Point Eight Seven Five Percent Series First Mortgage Bonds Due September Two Thousand Sixty Six [Member] | NEW YORK STOCK EXCHANGE, INC. [Member] | Entergy Arkansas [Member]
Title of 12(b) Security	Mortgage Bonds, 4.875% Series due September 2066
Trading Symbol	EAI
Security Exchange Name	NYSE
Four Point Eight Seven Five Percent Series First Mortgage Bonds Due September Two Thousand Sixty Six [Member] | NEW YORK STOCK EXCHANGE, INC. [Member] | Entergy Louisiana [Member]
Title of 12(b) Security	Mortgage Bonds, 4.875% Series due September 2066
Trading Symbol	ELC
Security Exchange Name	NYSE
Mortgage Bonds, Four Point Nine Zero Percent Series, Due October Two Thousand Sixty Six [Member] | NEW YORK STOCK EXCHANGE, INC. [Member] | Entergy Mississippi [Member]
Title of 12(b) Security	Mortgage Bonds, 4.90% Series due October 2066
Trading Symbol	EMP
Security Exchange Name	NYSE
Mortgage Bonds, 5.0% Series, Due December 2052 [Member] | NEW YORK STOCK EXCHANGE, INC. [Member] | Entergy New Orleans [Member]
Title of 12(b) Security	Mortgage Bonds, 5.0% Series due December 2052
Trading Symbol	ENJ
Security Exchange Name	NYSE
Mortgage Bonds, 5.5% Series, Due April 2066 [Member] | NEW YORK STOCK EXCHANGE, INC. [Member] | Entergy New Orleans [Member]
Title of 12(b) Security	Mortgage Bonds, 5.50% Series due April 2066
Trading Symbol	ENO
Security Exchange Name	NYSE
5.375% Series A Preferred Stock, Cumulative, No Par Value [Domain] | NEW YORK STOCK EXCHANGE, INC. [Member] | Entergy Texas [Member]
Title of 12(b) Security	5.375% Series A Preferred Stock, Cumulative, No Par Value (Liquidation Value $25 Per Share)
Trading Symbol	ETI/PR
Security Exchange Name	NYSE