Rate And Regulatory Matters (Details Of Other Regulatory Assets Included In Entergy Corporation And Subsidiaries) (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		$ 4,935,689	$ 4,769,913
Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		1,567,437	1,428,029
Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		1,145,842	1,168,058
Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		397,909	342,213
Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		251,433	268,106
Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		661,398	740,156
System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		444,327	411,212
Asset Retirement Obligation [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	746,000	677,200
Asset Retirement Obligation [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	345,200	322,900
Asset Retirement Obligation [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	218,600	199,400
Asset Retirement Obligation [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	7,600	7,200
Asset Retirement Obligation [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	4,300	4,200
Asset Retirement Obligation [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	169,100	142,500
Pension And Post Retirement Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	2,642,300	2,635,500
Pension And Post Retirement Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	757,000	786,600
Pension And Post Retirement Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	724,600	715,700
Pension And Post Retirement Costs [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	218,700	217,200
Pension And Post Retirement Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	102,800	108,800
Pension And Post Retirement Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	169,200	201,700
Pension And Post Retirement Costs [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	202,700	193,500
Provision For Storm Damages, Including Hurricane Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		558,900	637,000
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		76,200	88,900
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		14,300	0
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		82,300	93,600
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		386,100	442,400
Removal Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	436,500	353,900
Removal Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	176,900	128,500
Removal Costs [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	91,600	82,000
Removal Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	44,800	40,100
Removal Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	55,200	33,500
Removal Costs [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[1]	67,900	69,700
River Bend AFUDC [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		12,900	14,800
Business Combination External Costs Deferral [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	14,100	15,200
Nuclear Generation Development Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	36,400	43,700
Nuclear Generation Development Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	35,800	43,100
Rate Case Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		2,600	3,000
Little Gypsy Cost Proceeding [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		73,700	100,000
Little Gypsy Cost Proceeding [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		71,400	97,800
Transition to Competition Costs [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		37,700	47,900
Transition to Competition Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		37,700	47,900
Regulatory Clause Revenues, under-recovered [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		86,400	22,100
Regulatory Clause Revenues, under-recovered [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		28,200	10,100
Regulatory Clause Revenues, under-recovered [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		49,400	9,300
Regulatory Clause Revenues, under-recovered [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		4,400	4,300
Incremental Ice Storm Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		7,400	7,900
Michoud Plant Maintenance [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		1,400	3,300
Human Capital Management Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	4,400	7,000
Lake Catherine 4 Reliability and Sustainability Cost Deferral [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	8,900	9,800
Unamortized Loss on Reacquired Debt [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		82,900	91,400
Unamortized Loss on Reacquired Debt [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		24,300	27,600
Unamortized Loss on Reacquired Debt [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		24,700	27,000
Unamortized Loss on Reacquired Debt [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		17,600	18,900
Unamortized Loss on Reacquired Debt [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		3,000	3,400
Unamortized Loss on Reacquired Debt [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		8,700	9,000
Unamortized Loss on Reacquired Debt [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		4,600	5,500
MISO Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	5,500	11,100
ANO Fukushima and Flood Barrier costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent	[2]	14,400	16,100
Opportunity Sales [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		109,800	0
Opportunity Sales [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		109,800	0
Other Regulatory Assets (Liabilities) [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		125,100	161,200
Other Regulatory Assets (Liabilities) [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		9,200	11,500
Other Regulatory Assets (Liabilities) [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		29,400	55,100
Other Regulatory Assets (Liabilities) [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		13,000	7,600
Other Regulatory Assets (Liabilities) [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		5,800	7,400
Other Regulatory Assets (Liabilities) [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Regulatory Assets, Noncurrent		$ 4,500	$ 5,700

[1] Does not earn a return on investment, but is offset by related liabilities.

[2] Does not earn a return on investment.