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Rate And Regulatory Matters (Narrative) (Details) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) $ / kWh | Jan. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Aug. 31, 2017 | Jul. 31, 2015 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($)
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use |  |  |  |  |  |  | $ 25,800,000 | $ 145,026,000
Deferred Fuel Cost |  | $ 83,445,000 |  | $ 95,746,000 |  |  | 83,445,000 |
Entergy Louisiana [Member] |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |
Earned return on common equity |  |  | 9.06% |  |  |  |  |
Authorized return on common equity |  |  |  |  | 9.95% |  |  |
Earnings bandwidth basis points |  |  |  |  | 16000.00% |  |  |
Reduced earnings bandwidth basis points |  |  |  |  | 8000.00% |  |  |
Public Utilities, Requested Increase in Revenue Requirement |  |  | $ 100,000 |  |  |  |  |
Monthly increase in regulatory liability related to Tax Act |  |  | $ 9,100,000 |  |  |  |  |
Regulatory liability related to Tax Act |  | 27,000,000 |  |  |  |  | 27,000,000 |
Entergy Louisiana [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |
Earned return on common equity | 10.79% |  |  |  |  |  |  |
Public Utilities, proposed customer credits | $ 700,000 |  |  |  |  |  |  |
Proposed prospective reduction in the gas infrastructure rider | $ 200,000 |  |  |  |  |  |  |
Authorized return on common equity | 9.95% |  |  |  |  |  |  |
Target earned return on common equity | 9.80% |  |  |  |  |  |  |
Common equity basis point bandwidth | $ 60 |  |  |  |  |  |  |
Cap on potential revenue increase for 2018 rate case evaluation period | 35,000,000 |  |  |  |  |  |  |
Cap on potential revenue increase for 2018 and 2019 rate case evaluation periods | 70,000,000 |  |  |  |  |  |  |
Requirement for excess transmission project costs eligible for costs recovery mechanism | $ 100,000,000 |  |  |  |  |  |  |
Entergy Mississippi [Member] |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |
Deferred Fuel Cost |  | 18,627,000 |  | 32,444,000 |  |  | 18,627,000 |
Proposed customer credits due to internal restructuring |  | 27,000,000 |  |  |  |  |  |
Preferred Stock, Redemption Amount |  | 21,200,000 |  |  |  |  |  |
Entergy New Orleans [Member] |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |
Deferred Fuel Cost |  | 3,535,000 |  | 0 |  |  | 3,535,000 |
Benefit to electric customers related to reduction in income tax expense under Tax Act |  | 8,200,000 |  |  |  |  |  |
Benefit to gas customers related to reduction in income tax expense under Tax Act |  | 1,300,000 |  |  |  |  |  |
Entergy Texas [Member] |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |
System Agreement Bandwidth Remedy Payments |  |  |  |  |  | $ 10,900,000 |  |
Refund for fuel cost recovery |  |  |  | 30,500,000 |  |  |  |
Entergy Arkansas [Member] |  |  |  |  |  |  |  |
Regulatory Assets [Line Items] |  |  |  |  |  |  |  |
Deferred Fuel Cost |  | $ 61,282,000 |  | $ 63,302,000 |  |  | $ 61,282,000 |
Rate At Which Electricity Sold To Retail Customers | $ / kWh |  | 0.01547 |  |  |  |  |  |
Increase in Rate At Which Electricity Sold To Retail Customers | $ / kWh |  | 0.01882 |  |  |  |  |  |

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