Summary Of Significant Accounting Policies (Schedule Of Net Property, Plant, And Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	$ 5,844,000	$ 5,226,000
Distribution	8,000,000	7,648,000
Other	1,755,000	1,636,000
Construction work in progress	1,980,508	1,378,180
Nuclear fuel	923,000	1,038,000
Property, plant and equipment - net	29,664,360	27,921,407
Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	1,650,000	1,491,000
Distribution	2,226,000	2,144,000
Other	247,000	216,000
Construction work in progress	280,888	304,073
Nuclear fuel	277,000	307,000
Property, plant and equipment - net	6,855,419	6,464,316
Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	2,148,000	1,925,000
Distribution	2,748,000	2,632,000
Other	592,000	517,000
Construction work in progress	1,281,452	670,201
Nuclear fuel	337,000	250,000
Property, plant and equipment - net	12,786,242	11,499,760
Entergy Mississippi [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	900,000	740,000
Distribution	1,316,000	1,242,000
Other	203,000	201,000
Construction work in progress	149,367	118,182
Nuclear fuel	0	0
Property, plant and equipment - net	3,128,483	2,838,275
Entergy New Orleans [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	81,000	79,000
Distribution	440,000	414,000
Other	204,000	188,000
Construction work in progress	46,993	24,975
Nuclear fuel	0	0
Property, plant and equipment - net	979,313	919,492
Entergy Texas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	1,021,000	943,000
Distribution	1,270,000	1,216,000
Other	168,000	106,000
Construction work in progress	102,088	111,227
Nuclear fuel	0	0
Property, plant and equipment - net	3,091,996	2,859,239
System Energy [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	42,000	45,000
Distribution	0	0
Other	39,000	25,000
Construction work in progress	69,937	43,888
Nuclear fuel	208,000	260,000
Property, plant and equipment - net	2,018,562	2,157,026
Utility [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	5,842,000	5,223,000
Distribution	8,000,000	7,648,000
Other	1,748,000	1,521,000
Construction work in progress	1,951,000	1,334,000
Nuclear fuel	822,000	817,000
Property, plant and equipment - net	29,175,000	27,067,000
Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	2,000	3,000
Distribution	0	0
Other	3,000	111,000
Construction work in progress	30,000	44,000
Nuclear fuel	101,000	221,000
Property, plant and equipment - net	485,000	850,000
Parent & Other [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Transmission	0	0
Distribution	0	0
Other	4,000	4,000
Construction work in progress	0	0
Nuclear fuel	0	0
Property, plant and equipment - net	4,000	4,000
Nuclear Plant [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	6,946,000	6,948,000
Nuclear Plant [Member] | Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	1,368,000	1,201,000
Nuclear Plant [Member] | Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	3,664,000	3,540,000
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	1,660,000	1,783,000
Nuclear Plant [Member] | Utility [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	6,694,000	6,524,000
Nuclear Plant [Member] | Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	252,000	424,000
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	4,215,000	4,047,000
Other Plant In Service [Member] | Entergy Arkansas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	806,000	801,000
Other Plant In Service [Member] | Entergy Louisiana [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	2,016,000	1,966,000
Other Plant In Service [Member] | Entergy Mississippi [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	560,000	537,000
Other Plant In Service [Member] | Entergy New Orleans [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	207,000	213,000
Other Plant In Service [Member] | Entergy Texas [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	531,000	483,000
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 [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	4,118,000	4,000,000
Other Plant In Service [Member] | Entergy Wholesale Commodities [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	97,000	47,000
Other Plant In Service [Member] | Parent & Other [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Production	$ 0	$ 0