Summary Of Significant Accounting Policies (Schedule Of Net Property, Plant, And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	$ 4,431,000	$ 4,197,000
Distribution	7,207,000	6,973,000
Other	1,536,000	1,521,000
Construction work in progress	1,456,735	1,425,981
Nuclear fuel	1,345,000	1,542,000
Property, plant and equipment - net	27,824,361	28,722,946
Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	1,223,000	1,166,000
Distribution	1,997,000	1,928,000
Other	179,000	164,000
Construction work in progress	388,075	284,322
Nuclear fuel	286,000	294,000
Property, plant and equipment - net	5,862,253	5,526,200
Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	1,693,000	1,570,000
Distribution	2,488,000	2,447,000
Other	483,000	460,000
Construction work in progress	420,874	369,359
Nuclear fuel	387,000	295,000
Property, plant and equipment - net	10,634,467	10,256,350
Entergy Mississippi [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	658,000	642,000
Distribution	1,166,000	1,125,000
Other	199,000	194,000
Construction work in progress	114,067	67,514
Nuclear fuel	0	0
Property, plant and equipment - net	2,666,420	2,555,077
Entergy New Orleans [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	65,000	54,000
Distribution	400,000	407,000
Other	184,000	182,000
Construction work in progress	29,027	18,866
Nuclear fuel	0	0
Property, plant and equipment - net	664,965	650,874
Entergy Texas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	723,000	695,000
Distribution	1,156,000	1,116,000
Other	104,000	98,000
Construction work in progress	210,964	125,425
Nuclear fuel	0	0
Property, plant and equipment - net	2,656,535	2,432,571
System Energy [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	46,000	48,000
Distribution	0	0
Other	17,000	17,000
Construction work in progress	92,546	50,382
Nuclear fuel	184,000	251,000
Property, plant and equipment - net	2,143,386	2,300,756
Utility Plants [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	4,408,000	4,164,000
Distribution	7,207,000	6,973,000
Other	1,422,000	1,373,000
Construction work in progress	1,327,000	969,000
Nuclear fuel	857,000	840,000
Property, plant and equipment - net	24,954,000	23,972,000
Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	23,000	33,000
Distribution	0	0
Other	111,000	145,000
Construction work in progress	130,000	456,000
Nuclear fuel	489,000	702,000
Property, plant and equipment - net	2,868,000	4,747,000
Parent & Other [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	0	0
Distribution	0	0
Other	3,000	3,000
Construction work in progress	0	1,000
Nuclear fuel	0	0
Property, plant and equipment - net	3,000	4,000
Nuclear Plant [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	8,672,000	9,639,000
Nuclear Plant [Member] | Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	1,192,000	1,097,000
Nuclear Plant [Member] | Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	3,611,000	3,554,000
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	1,803,000	1,935,000
Nuclear Plant [Member] | Utility Plants [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	6,606,000	6,586,000
Nuclear Plant [Member] | Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	2,066,000	3,053,000
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	3,176,000	3,425,000
Other Plant In Service [Member] | Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	597,000	593,000
Other Plant In Service [Member] | Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	1,551,000	1,561,000
Other Plant In Service [Member] | Entergy Mississippi [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	529,000	526,000
Other Plant In Service [Member] | Entergy New Orleans [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	(13,000)	(11,000)
Other Plant In Service [Member] | Entergy Texas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	463,000	399,000
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	3,127,000	3,067,000
Other Plant In Service [Member] | Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	49,000	358,000
Other Plant In Service [Member] | Parent & Other [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	$ 0	$ 0