Schedule II - Valuation And Qualifying Accounts (Details) - Allowance for Doubtful Accounts [Member] - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		$ 11,924	$ 39,895	$ 35,663
Additions Charged to Income or Regulatory Assets		4,211	7,505	6,926
Other Changes Deductions from Provisions	[1]	(2,548)	(35,476)	(2,694)
Balance at End of Period		13,587	11,924	39,895
Entergy Arkansas [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		1,211	34,226	32,247
Additions Charged to Income or Regulatory Assets		503	902	2,759
Other Changes Deductions from Provisions	[1]	(651)	(33,917)	(780)
Balance at End of Period		1,063	1,211	34,226
Entergy Louisiana [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		6,277	4,209	1,609
Additions Charged to Income or Regulatory Assets		3,108	2,942	3,464
Other Changes Deductions from Provisions	[1]	(955)	(874)	(864)
Balance at End of Period		8,430	6,277	4,209
Entergy Mississippi [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		549	718	873
Additions Charged to Income or Regulatory Assets		255	259	247
Other Changes Deductions from Provisions	[1]	(230)	(428)	(402)
Balance at End of Period		574	549	718
Entergy New Orleans [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		3,059	268	262
Additions Charged to Income or Regulatory Assets		152	2,872	217
Other Changes Deductions from Provisions	[1]	(154)	(81)	(211)
Balance at End of Period		3,057	3,059	268
Entergy Texas [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period		828	474	672
Additions Charged to Income or Regulatory Assets		192	531	239
Other Changes Deductions from Provisions	[1]	(557)	(177)	(437)
Balance at End of Period		$ 463	$ 828	$ 474

[1] (1) Deductions represent write-offs of accounts receivable balances and are reduced by recoveries of amounts previously written off.