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, 2017 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	0.0070
Letters Of Credit	1,000,000
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	0.0070
Letters Of Credit	29,700,000
Entergy Mississippi [Member] | Credit Facility of Forty Million [Domain]
Uncommitted Credit Facility	40,000,000
Line of Credit Facility, Commitment Fee Amount	0.0070
Letters Of Credit	15,300,000
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	1,400,000
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	$ 22,800,000