Rate And Regulatory Matters (Narrative) (Details)	1 Months Ended																		3 Months Ended	9 Months Ended		36 Months Ended
	Oct. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jul. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	May 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Feb. 29, 2016 USD ($)	Jan. 31, 2016	Dec. 31, 2015 USD ($)	Nov. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jul. 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Feb. 28, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jul. 31, 2014 USD ($)	Jan. 31, 2013 USD ($) intervenor	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Mar. 31, 2016 USD ($)	May 31, 2015 USD ($)	Jan. 31, 2015 USD ($)
Commitments and Contingencies [Abstract]
Deferred Fuel Cost		$ 41,686,000								$ 0									$ 0	$ 41,686,000
Payments to Acquire Property, Plant, and Equipment																				(949,329,000)	$ 0
Impairment of Long-Lived Assets Held-for-use																				33,170,000	1,642,204,000
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Refund to customers per LPSC Staff January 2013 audit report																		$ 1,900,000
Realignment of the recovery from Entergy Louisiana's fuel adjustment clause to base rates per LPSC January 2013 audit report																		$ 1,000,000
Number of Parties That Intervened in LPSC Proceeding | intervenor																		2
Number of Intervenors | intervenor																		1
Commitments and Contingencies [Abstract]
Public Utilities Earned Return On Common Equity					9.07%
LPSC staff recommended fuel refund including interest							$ 8,600,000
Refund To Customers																				43,000,000
One-time credit to customers resulting from potential future service credits		24,000,000																		24,000,000
Amount of LPSC Recommended Realignment of Fuel Costs to Base Rates							12,700,000
LPSC previously recommended disallowance of portion of refund to customers		3,400,000
Payments to Acquire Property, Plant, and Equipment							(474,000,000)													(474,670,000)	0
Earned return on common equity									10.22%
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 increase Legacy Entergy Louisiana additional capacity mechanism					$ 14,200,000
Adjustment to formula rate plan to increase Legacy Entergy Gulf States Louisiana additional capacity mechanism					500,000
Adjustment to formula rate plan to increase Legacy Entergy Louisiana revenues due to effect of system agreement termination					10,000,000
Adjustment to formula rate plan to decrease Legacy Entergy Gulf States Louisiana revenues due to effect of system agreement termination					58,700,000
Adjustment to formula rate plan for increase in MISO cost recovery mechanism					11,000,000
Recommended potential project and replacement power cost disallowances																	$ 71,000,000
Intervenor Recommended Disallowance of Incremental Project Costs																	$ 141,000,000
Impairment of Long-Lived Assets Held-for-use																$ 16,000,000
ALJ Recommended Disallowance of Capital Costs										67,000,000
Project and Replacement Power Cost Disallowances										2,000,000
ALJ Recommended Charges Related to Waterford 3 Steam Generator Project																			77,000,000
Write-Off of Waterford 3 Replacement Steam Generator																			45,000,000
Regulatory Charge Recorded Due to Probability of Non-Recovery Per ALJ Recommendation																			32,000,000
Entergy Mississippi [Member]
Commitments and Contingencies [Abstract]
Public Utilities Earned Return On Common Equity				10.07%
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
Projected Over-Recovery Energy Cost Recovery Rider								$ 68,000,000				$ 48,000,000									48,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount							$ 32,600,000
Public Utilities, Requested Return on Equity, Percentage							9.96%
Public Utilities, Approved Rate Increase (Decrease), Amount				$ 23,700,000
Rate Increase Included in Formula Rate Plan				19,400,000
Storm Reserve Accrual Hurricane Isaac															$ 0
Increase in expenses to be collected through ad valorem tax adjustment rider				4,300,000
Authorized Storm Damage Reserve Balance		15,000,000																		15,000,000				$ 15,000,000
Balance At Which Storm Damage Accrual Will Return To Current Level															$ 10,000,000
Upper limit not exceeded for storm accrual balance						$ 10,000,000
Entergy Mississippi [Member] | Subsequent Event [Member]
Commitments and Contingencies [Abstract]
Storm Reserve Accrual Hurricane Isaac	$ 0
Balance At Which Storm Damage Accrual Will Return To Current Level	10,000,000
Entergy New Orleans [Member]
Commitments and Contingencies [Abstract]
Long-term payable due to Entergy Louisiana		20,527,000								20,527,000									20,527,000	20,527,000
Payments to Acquire Property, Plant, and Equipment							$ (237,000,000)													(237,335,000)	0
Monthly customer credits			$ 1,400,000
Authorized monthly customer credits											$ 400,000
Proposed annual customer credits			5,000,000
Redemption of Preferred Equity			21,000,000
Call Premium on Preferred Stock			819,000
Entergy New Orleans [Member] | Subsequent Event [Member]
Commitments and Contingencies [Abstract]
Estimated Net benefit to Customers Anticipated with AMI Deployment	101,000,000
Book Value of Existing Meters to be Retired with AMI Deployment	21,000,000
Entergy Texas [Member]
Commitments and Contingencies [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount												13,000,000
Public Utilities, Approved Rate Increase (Decrease), Amount			10,500,000
Amount Collected From Customers		29,500,000
Authorized collection through TCRF rider		10,500,000
Refund To Customers				$ 68,000,000		56,200,000
Refund for fuel cost recovery						41,800,000
System Agreement Bandwidth Refund Related to Calendar Year 2006 Production Costs													$ 10,900,000
System Agreement Bandwidth Refund Related to Calendar Year 2006-2008 Production Costs						$ 3,500,000
Reduction in approved retail rate increase											2,000,000
Intervenor Recommended Disallowance Due to Load Growth Adjustment											$ 3,400,000
Jurisdictional eligible fuel and purchased power expenses, net of credits																						$ 1,770,000,000
Estimated deferred fuel over recovery balance for reconciliation period			19,300,000
Entergy Arkansas [Member]
Commitments and Contingencies [Abstract]
APSC and Intervener Recommended Revenue Requirement												$ 217,900,000
APSC and Intervener Recommended Return on Equity												9.65%
Rate Increase										225,000,000
Net increase in revenues										$ 133,000,000				$ 167,000,000
Authorized return on common equity										9.75%
Deferred Fuel Cost		41,686,000								$ 0									$ 0	41,686,000
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 67,700,000											$ 268,400,000
Public Utilities, Requested Return on Equity, Percentage			9.75%											10.20%
Estimated Net benefit to Customers Anticipated with AMI Deployment		431,000,000
Book Value of Existing Meters to be Retired with AMI Deployment		$ 57,000,000																		57,000,000
Basis Point Band										5000.00%
Payments to Acquire Property, Plant, and Equipment							(237,000,000)													$ (237,324,000)	$ 0
Post-Fukushima Compliance Costs										$ 7,700,000
Flood Barrier Compliance Costs										$ 9,900,000
Reduction in approved retail rate increase								$ 5,000,000
Interim Base Rate Adjustment Surcharge Recovery							21,100,000
ALJ Recommended Percentage By Which Payments Be Reduced						20.00%
Liability Recorded Related to Estimated Payments Due Utility Operating Companies							87,000,000															87,000,000
Regulatory Asset Recorded to Represent Estimate of Recoverable Retail Portion of Costs							$ 75,000,000															$ 75,000,000
Redetermination Of Production Cost Allocation Rider Unrecovered Retail Balance					$ 1,900,000
Entergy Arkansas [Member] | Subsequent Event [Member]
Commitments and Contingencies [Abstract]
Public Utilities, Requested Increase in Revenue Requirement	$ 54,400,000