Summary Of Significant Accounting Policies (Schedule Of Net Property, Plant, And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	$ 5,226,000	$ 4,431,000
Distribution	7,648,000	7,207,000
Other	1,636,000	1,536,000
Construction work in progress	1,378,180	1,456,735
Nuclear fuel	1,038,000	1,345,000
Property, plant and equipment - net	27,921,407	27,824,361
Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	1,491,000	1,223,000
Distribution	2,144,000	1,997,000
Other	216,000	179,000
Construction work in progress	304,073	388,075
Nuclear fuel	307,000	286,000
Property, plant and equipment - net	6,464,316	5,862,253
Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	1,925,000	1,693,000
Distribution	2,632,000	2,488,000
Other	517,000	483,000
Construction work in progress	670,201	420,874
Nuclear fuel	250,000	387,000
Property, plant and equipment - net	11,499,760	10,634,467
Entergy Mississippi [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	740,000	658,000
Distribution	1,242,000	1,166,000
Other	201,000	199,000
Construction work in progress	118,182	114,067
Nuclear fuel	0	0
Property, plant and equipment - net	2,838,275	2,666,420
Entergy New Orleans [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	79,000	65,000
Distribution	414,000	400,000
Other	188,000	184,000
Construction work in progress	24,975	29,027
Nuclear fuel	0	0
Property, plant and equipment - net	919,492	664,965
Entergy Texas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	943,000	723,000
Distribution	1,216,000	1,156,000
Other	106,000	104,000
Construction work in progress	111,227	210,964
Nuclear fuel	0	0
Property, plant and equipment - net	2,859,239	2,656,535
System Energy [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	45,000	46,000
Distribution	0	0
Other	25,000	17,000
Construction work in progress	43,888	92,546
Nuclear fuel	260,000	184,000
Property, plant and equipment - net	2,157,026	2,143,386
Utility Plants [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	5,223,000	4,408,000
Distribution	7,648,000	7,207,000
Other	1,521,000	1,422,000
Construction work in progress	1,334,000	1,327,000
Nuclear fuel	817,000	857,000
Property, plant and equipment - net	27,067,000	24,954,000
Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	3,000	23,000
Distribution	0	0
Other	111,000	111,000
Construction work in progress	44,000	130,000
Nuclear fuel	221,000	489,000
Property, plant and equipment - net	850,000	2,868,000
Parent & Other [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	0	0
Distribution	0	0
Other	4,000	3,000
Construction work in progress	0	0
Nuclear fuel	0	0
Property, plant and equipment - net	4,000	3,000
Nuclear Plant [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	6,948,000	8,672,000
Nuclear Plant [Member] | Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	1,201,000	1,192,000
Nuclear Plant [Member] | Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	3,540,000	3,611,000
Nuclear Plant [Member] | Entergy Mississippi [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	0	0
Nuclear Plant [Member] | Entergy New Orleans [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	0	0
Nuclear Plant [Member] | Entergy Texas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	0	0
Nuclear Plant [Member] | System Energy [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	1,783,000	1,803,000
Nuclear Plant [Member] | Utility Plants [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	6,524,000	6,606,000
Nuclear Plant [Member] | Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	424,000	2,066,000
Nuclear Plant [Member] | Parent & Other [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	0	0
Other Plant In Service [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	4,047,000	3,176,000
Other Plant In Service [Member] | Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	801,000	597,000
Other Plant In Service [Member] | Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	1,966,000	1,551,000
Other Plant In Service [Member] | Entergy Mississippi [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	537,000	529,000
Other Plant In Service [Member] | Entergy New Orleans [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	213,000	(13,000)
Other Plant In Service [Member] | Entergy Texas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	483,000	463,000
Other Plant In Service [Member] | System Energy [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	0	0
Other Plant In Service [Member] | Utility Plants [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	4,000,000	3,127,000
Other Plant In Service [Member] | Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	47,000	49,000
Other Plant In Service [Member] | Parent & Other [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	$ 0	$ 0