Rate And Regulatory Matters (Details Of Other Regulatory Assets Included In Entergy Corporation And Subsidiaries) (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		$ 4,769,913	$ 4,704,796
Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		1,428,029	1,333,773
Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		1,168,058	1,217,874
Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		342,213	328,681
Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		268,106	265,322
Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		740,156	812,862
System Energy [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		411,212	347,830
Asset Retirement Obligation [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	677,200	589,100
Asset Retirement Obligation [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	322,900	288,000
Asset Retirement Obligation [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	199,400	180,800
Asset Retirement Obligation [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	7,200	6,700
Asset Retirement Obligation [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	4,200	4,000
Asset Retirement Obligation [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	142,500	108,600
New Nuclear Generation Development Costs [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[2]	43,700	51,100
Pension And Post Retirement Costs [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	2,635,500	2,574,900
Pension And Post Retirement Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	786,600	766,500
Pension And Post Retirement Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	715,700	718,700
Pension And Post Retirement Costs [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	217,200	216,100
Pension And Post Retirement Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	108,800	103,700
Pension And Post Retirement Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	201,700	193,600
Pension And Post Retirement Costs [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	193,500	178,000
Provision For Storm Damages, Including Hurricane Costs [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		637,000	717,800
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		88,900	97,200
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		93,600	104,000
Provision For Storm Damages, Including Hurricane Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		442,400	516,200
Removal Costs [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	353,900	273,300
Removal Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	128,500	85,700
Removal Costs [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	82,000	77,500
Removal Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	40,100	29,400
Removal Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	33,500	25,800
Removal Costs [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[1]	69,700	54,800
River Bend AFUDC [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		14,800	16,700
Business Combination External Costs Deferral [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[2]	15,200	16,100
Nuclear Generation Development Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[2]	43,100	50,400
Rate Case Costs [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		3,000	3,200
Rate Case Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[2]	500	3,800
Little Gypsy Cost Proceeding [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		100,000	121,100
Little Gypsy Cost Proceeding [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		97,800	119,200
Regulatory Clause Revenues, under-recovered [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		22,100	32,200
Regulatory Clause Revenues, under-recovered [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		10,100	18,100
Regulatory Clause Revenues, under-recovered [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		9,300	7,600
Regulatory Clause Revenues, under-recovered [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		4,300	3,100
Incremental Ice Storm Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		7,900	8,400
Michoud Plant Maintenance [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		3,300	5,200
Human Capital Management Costs [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		17,300	28,300
Human Capital Management Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[2]	7,000	10,400
Human Capital Management Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		10,000	17,600
Lake Catherine 4 Reliability and Sustainability Cost Deferral [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[2]	9,800	10,400
Unamortized Loss on Reacquired Debt [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		91,400	66,700
Unamortized Loss on Reacquired Debt [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		27,600	23,000
Unamortized Loss on Reacquired Debt [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		27,000	19,200
Unamortized Loss on Reacquired Debt [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		18,900	7,100
Unamortized Loss on Reacquired Debt [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		3,400	1,600
Unamortized Loss on Reacquired Debt [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		9,000	9,400
Unamortized Loss on Reacquired Debt [Member] | System Energy [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		5,500	6,400
Other [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		107,700	127,700
Other [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		11,500	8,600
Other [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		23,300	38,100
Other [Member] | Entergy Mississippi [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		7,600	13,700
Other [Member] | Entergy New Orleans [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		7,400	11,100
Other [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		5,200	6,700
Transition to Competition Costs [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		47,900	57,400
Transition to Competition Costs [Member] | Entergy Texas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		47,900	57,400
MISO Costs [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		36,200	65,200
MISO Costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[2]	11,100	17,500
MISO Costs [Member] | Entergy Louisiana [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets		21,800	41,100
ANO Fukushima and Flood Barrier costs [Member] | Entergy Arkansas [Member]
Details of Other regulatory assets [Abstract]
Other Regulatory Assets	[2]	$ 16,100	$ 0

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

[2] Does not earn a return on investment.