Summary Of Significant Accounting Policies (Schedule Of Net Property, Plant, And Equipment) (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	$ 4,197,000,000	$ 3,929,000,000
Distribution	6,973,000,000	6,716,000,000
Other	1,521,000,000	1,652,000,000
Construction work in progress	1,425,981,000	1,514,857,000
Nuclear fuel	1,542,000,000	1,567,000,000
Property, plant and equipment - net	28,722,946,000	27,881,644,000
Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	1,166,000,000	1,086,000,000
Distribution	1,928,000,000	1,831,000,000
Other	164,000,000	192,000,000
Construction work in progress	284,322,000	209,036,000
Nuclear fuel	294,000,000	322,000,000
Property, plant and equipment - net	5,526,200,000	5,295,579,000
Entergy Gulf States Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	711,000,000	646,000,000
Distribution	1,004,000,000	950,000,000
Other	173,000,000	184,000,000
Construction work in progress	127,436,000	105,314,000
Nuclear fuel	132,000,000	197,000,000
Property, plant and equipment - net	3,832,411,000	3,774,651,000
Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	859,000,000	770,000,000
Distribution	1,443,000,000	1,420,000,000
Other	287,000,000	292,000,000
Construction work in progress	241,923,000	672,883,000
Nuclear fuel	163,000,000	147,000,000
Property, plant and equipment - net	6,423,939,000	6,188,322,000
Entergy Mississippi [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	642,000,000	638,000,000
Distribution	1,125,000,000	1,096,000,000
Other	194,000,000	197,000,000
Construction work in progress	67,514,000	37,316,000
Property, plant and equipment - net	2,555,077,000	2,504,898,000
Entergy New Orleans [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	44,000,000	31,000,000
Distribution	357,000,000	340,000,000
Other	181,000,000	181,000,000
Construction work in progress	18,866,000	29,312,000
Property, plant and equipment - net	589,762,000	574,456,000
Entergy Texas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	695,000,000	673,000,000
Distribution	1,116,000,000	1,079,000,000
Other	98,000,000	106,000,000
Construction work in progress	125,425,000	94,743,000
Property, plant and equipment - net	2,432,571,000	2,323,501,000
System Energy [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	48,000,000	49,000,000
Other	17,000,000	17,000,000
Construction work in progress	50,382,000	29,061,000
Nuclear fuel	251,000,000	189,000,000
Property, plant and equipment - net	2,300,756,000	2,214,141,000
Utility Plants [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	4,164,000,000	3,894,000,000
Distribution	6,973,000,000	6,716,000,000
Other	1,373,000,000	1,475,000,000
Construction work in progress	969,000,000	1,217,000,000
Nuclear fuel	840,000,000	855,000,000
Property, plant and equipment - net	23,972,000,000	23,223,000,000
Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	33,000,000	35,000,000
Other	145,000,000	174,000,000
Construction work in progress	456,000,000	298,000,000
Nuclear fuel	702,000,000	712,000,000
Property, plant and equipment - net	4,747,000,000	4,656,000,000
Parent & Other [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Other	3,000,000	3,000,000
Construction work in progress	1,000,000	0
Property, plant and equipment - net	4,000,000	3,000,000
Nuclear Plant [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	9,639,000,000	9,667,000,000
Nuclear Plant [Member] | Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	1,097,000,000	1,047,000,000
Nuclear Plant [Member] | Entergy Gulf States Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	1,403,000,000	1,422,000,000
Nuclear Plant [Member] | Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	2,151,000,000	2,202,000,000
Nuclear Plant [Member] | System Energy [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	1,935,000,000	1,930,000,000
Nuclear Plant [Member] | Utility Plants [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	6,586,000,000	6,601,000,000
Nuclear Plant [Member] | Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	3,053,000,000	3,066,000,000
Nuclear Plant [Member] | Parent & Other [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	0
Other Plant In Service [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	3,425,000,000	2,836,000,000
Other Plant In Service [Member] | Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	593,000,000	609,000,000
Other Plant In Service [Member] | Entergy Gulf States Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	282,000,000	271,000,000
Other Plant In Service [Member] | Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	1,279,000,000	684,000,000
Other Plant In Service [Member] | Entergy Mississippi [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	526,000,000	537,000,000
Other Plant In Service [Member] | Entergy New Orleans [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	(11,000,000)	(7,000,000)
Other Plant In Service [Member] | Entergy Texas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	399,000,000	371,000,000
Other Plant In Service [Member] | Utility Plants [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	3,067,000,000	2,465,000,000
Other Plant In Service [Member] | Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	$ 358,000,000	$ 371,000,000