Rate And Regulatory Matters (Narrative) (Details) $ in Thousands	1 Months Ended											3 Months Ended
	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 ($)	Apr. 30, 2015 USD ($)	Aug. 31, 2013	Jan. 31, 2013 USD ($) intervenor	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	May. 31, 2015 USD ($)
Commitments and Contingencies [Abstract]
Deferred Fuel Cost		$ 28,296			$ 0							$ 28,296
Payments to Acquire Property, Plant, and Equipment												(947,778)	$ 0
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Refund to customers per LPSC Staff January 2013 audit report											$ 1,900
Realignment of the recovery from Entergy Louisiana's fuel adjustment clause to base rates per LPSC January 2013 audit report											$ 1,000
Number of Parties That Intervened in LPSC Proceeding | intervenor											2
Number of Intervenors | intervenor											1
Commitments and Contingencies [Abstract]
LPSC staff recommended fuel refund including interest		8,600
Amount of LPSC Recommended Realignment of Fuel Costs to Base Rates		12,700
Payments to Acquire Property, Plant, and Equipment		(474,000)										(473,888)	0
Earned return on common equity				10.22%
Estimated costs at completion for Ninemile 6 project								$ 648,000
Decrease in estimated costs at completion for Ninemile 6 project								76,000
Entergy Mississippi [Member]
Commitments and Contingencies [Abstract]
Rate Increase		$ 32,600
Deferred Fuel Over-Recovery Balance														$ 58,300
Under-Recovery Under Power Management Rider														$ 12,300
Net Over-Recovery of Rider Revenues								46,000
Projected Over-Recovery Energy Cost Recovery Rider			$ 68,000			$ 48,000
Earned return on common equity		9.96%
Entergy New Orleans [Member]
Commitments and Contingencies [Abstract]
Long-term payable due to Entergy Louisiana		$ 20,527			20,527							20,527
Payments to Acquire Property, Plant, and Equipment		(237,000)										(236,944)	0
Entergy Texas [Member]
Commitments and Contingencies [Abstract]
Public Utilities, Requested Rate Increase (Decrease), Amount							$ 13,000
System Agreement Bandwidth Refund Related to Calendar Year 2006 Production Costs								$ 10,900
Reduction in approved retail rate increase						2,000
Intervenor Recommended Disallowance Due to Load Growth Adjustment						$ 3,400
Entergy Texas [Member] | Subsequent Event [Member]
Commitments and Contingencies [Abstract]
Refund To Customers	$ 56,200
Refund for fuel cost recovery	41,800
System Agreement Bandwidth Refund Related to Calendar Year 2006-2008 Production Costs	$ 3,500
Entergy Arkansas [Member]
Commitments and Contingencies [Abstract]
Public Utilities Earned Return On Common Equity									10.20%
APSC and Intervener Recommended Revenue Requirement							$ 217,900
APSC and Intervener Recommended Return on Equity							9.65%
Net increase in revenues					133,000				$ 167,000
Rate Increase									$ 268,400
Deferred Fuel Cost		28,296			0							28,296
Public Utilities, Approved Rate Increase (Decrease), Amount					$ 225,000
Public Utilities, Approved Return on Equity, Percentage					9.75%
Basis Point Band					50.00%
Payments to Acquire Property, Plant, and Equipment		(237,000)										(236,947)	$ 0
Post-Fukushima Compliance Costs					$ 7,700
Flood Barrier Compliance Costs					$ 9,900
Reduction in approved retail rate increase			$ 5,000
Interim Base Rate Adjustment Surcharge Recovery		21,100
ALJ Recommended Percentage By Which Payments Be Reduced										20.00%
Liability Recorded Related to Estimated Payments Due Utility Operating Companies		87,000										87,000
Regulatory Asset Recorded to Represent Estimate of Recoverable Retail Portion of Costs		$ 75,000										$ 75,000