Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings Uncommitted Standby Letter of Credit Facilities to Support MISO Obligations (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)
Letters Of Credit	$ 6,000,000
Entergy Arkansas [Member] | Credit Facility Of Twenty Five Million [Member]
Uncommitted Credit Facility	25,000,000
Line of Credit Facility, Commitment Fee Amount	0.0078
Letters Of Credit	1,000,000
Entergy Louisiana [Member]
Letters of credit posted to cover derivative exposure	300,000
Entergy Louisiana [Member] | Credit Facility of One Hundred and Twenty Five Million [Member]
Uncommitted Credit Facility	125,000,000
Line of Credit Facility, Commitment Fee Amount	0.0078
Letters Of Credit	2,200,000
Entergy Mississippi [Member]
Letters of credit posted to cover derivative exposure	200,000
Entergy Mississippi [Member] | Credit Facility of Sixty Five Million
Uncommitted Credit Facility	65,000,000
Line of Credit Facility, Commitment Fee Amount	0.0078
Letters Of Credit	1,000,000
Non-MISO Letters Of Credit	1,000,000
Entergy New Orleans [Member]
Letters of credit posted to cover derivative exposure	200,000
Entergy New Orleans [Member] | Credit Facility of Fifteen Million [Domain]
Uncommitted Credit Facility	15,000,000
Line of Credit Facility, Commitment Fee Amount	0.0100
Letters Of Credit	1,000,000
Entergy Texas [Member]
Letters of credit posted to cover derivative exposure	500,000
Entergy Texas [Member] | Credit Facility of Fifty Million [Domain]
Uncommitted Credit Facility	50,000,000
Line of Credit Facility, Commitment Fee Amount	0.0070
Letters Of Credit	$ 6,200,000