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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 |  |

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