Rate And Regulatory Matters (Narrative) (Details)	1 Months Ended										3 Months Ended	10 Months Ended
	Sep. 30, 2015 USD ($)	Jul. 31, 2015 USD ($) MW	Jun. 30, 2015 USD ($)	May. 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Feb. 28, 2015	Jan. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Aug. 31, 2014 USD ($)	Sep. 30, 2015 USD ($)	Oct. 31, 2015 USD ($)	Sep. 01, 2015 USD ($)
Commitments and Contingencies [Abstract]
Deferred Fuel Cost	$ 54,431,000							$ 155,140,000			$ 54,431,000
Entergy Louisiana [Member]
Commitments and Contingencies [Abstract]
Estimated Revenue Requirement Implemented for Ninemile 6								51,100,000
Estimated Customer Benefits Anticipated with Business Combination									$ 128,000,000
Proposed Guaranteed Savings Projected for Business Combination									$ 97,000,000
Customer Benefits Anticipated with Business Combination Per Stipulated Settlement with LPSC		$ 107,000,000
Rate Increase Included in Legacy Formula Rate Plan		10,000,000
Upper Limit on Rates		30,000,000
Deferred External Costs Associated with Business Combination											14,000,000
Estimated costs at completion for Ninemile 6 project		648,000,000
Decrease in estimated costs at completion for Ninemile 6 project		76,000,000
Adjustment to formula rate plan to decrease additional capacity mechanism	17,800,000
Adjustment to formula rate plan to to decrease MISO recovery mechanism	$ 5,500,000
Purchase price of net assets that support Algiers customers													$ 85,000,000
Return on common equity on formula rate plan	9.09%
Rate Increase Included in Formula Rate Plan	$ 35,700,000
Allowed Maximum Deferred External Costs Associated with Business Combination		25,000,000
Entergy Mississippi [Member]
Commitments and Contingencies [Abstract]
Deferred Fuel Over-Recovery Balance				$ 58,300,000
Under-Recovery Under Power Management Rider				12,300,000
Net Over-Recovery of Rider Revenues		$ 46,000,000
Refund Period for Over-Recovery		6 months
Entergy Gulf States Louisiana [Member]
Commitments and Contingencies [Abstract]
Public Utilities Earned Return On Common Equity							7.20%
Net increase in revenues					$ 688,000
Recommended adjustment to earned return on equity					7.24%
Public Utilities, Requested Rate Increase (Decrease), Amount							$ 706,000
LPSC Recommended Number of Adjustments to As-Filed Gas Rate Stabilization Plan					2
Adjustment to formula rate plan to increase additional capacity mechanism	4,300,000
Entergy New Orleans [Member]
Commitments and Contingencies [Abstract]
Requested capacity to purchase on a life-of-unit basis from Union Power Station						20.00%
Refund To Customers			$ 4,800,000
Power blocks						2
Financing order authorized to issue storm cost recovery bonds				98,700,000
Replenishment amount for storm reserve spending				63,900,000
Amount of Hurricane Issac storm cost to be recovered through securitization				31,800,000
Up Front Financing Costs On Issuance Of Bonds To Recover Storm Damage Restoration Costs				$ 3,000,000
Purchase price of net assets that support Algiers customers													$ 85,000,000
Long-term payable due to Entergy Louisiana	25,500,000							82,316,000			25,500,000
Entergy New Orleans [Member] | Subsequent Event [Member]
Commitments and Contingencies [Abstract]
Cash Paid to Entergy Louisiana for Algiers Assets												$ 58,700,000
Entergy Texas [Member]
Commitments and Contingencies [Abstract]
Megawatt Capacity of Each Power Block at Union Power Station | MW		495
Requested increase in retail revenues per request for annual distribution cost recovery factor rider	6,500,000
Amount Collected From Customers	10,100,000
Deferred Fuel Cost	18,385,000							11,861,000			18,385,000
Power blocks		1,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount	13,000,000
Refund for fuel cost recovery										$ 24,600,000
System Agreement Bandwidth Refund		$ 10,900,000
Write-off of Rate Case Expenses and Acquisition Costs											4,700,000
Entergy Arkansas [Member]
Commitments and Contingencies [Abstract]
Public Utilities Earned Return On Common Equity					10.20%
APSC and Intervener Recommended Revenue Requirement	217,900,000
APSC and Intervener Recommended Return on Equity	0.0965
Net increase in revenues					$ 167,000,000
Rate Increase					$ 268,400,000
Deferred Fuel Cost	$ 36,046,000							$ 143,279,000			$ 36,046,000