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Risk Management and Fair Values (Assets And Liabilities At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | $ 5,452,000 | $ 5,350,000
Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 1,010,000 | 1,287,000
Assets Held-in-trust, Current |  | 197,000 |
Liabilities at fair value on a recurring basis |  |  |
Total |  |  | 15,000
Assets, Fair Value Disclosure |  | 7,357,000 | 7,330,000
Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 9,000 | 9,000
Power Contracts Liabilities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  |  | 6,000
Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 446,000 | 468,000
Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 2,249,000 | 2,155,000
Common trust funds valued using Net Asset Value [Domain] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1],[2] | 2,757,000 | 2,727,000
Power Contracts Assets [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 183,000 | 195,000
Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 454,000 | 425,000
Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 52,000 | 50,000
Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 9,000 | 23,000
Fair Value Inputs Level 1 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 1,010,000 | 1,287,000
Assets Held-in-trust, Current |  | 197,000 |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 9,000 |
Total |  |  | 9,000
Assets, Fair Value Disclosure |  | 3,219,000 | 3,291,000
Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  |  | 9,000
Fair Value Inputs Level 1 [Member] | Power Contracts Liabilities [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  |  | 0
Fair Value Inputs Level 1 [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 446,000 | 468,000
Fair Value Inputs Level 1 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 1,060,000 | 1,061,000
Fair Value Inputs Level 1 [Member] | Power Contracts Assets [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Fair Value Inputs Level 1 [Member] | Storm Reserve Escrow Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 454,000 | 425,000
Fair Value Inputs Level 1 [Member] | Securitization Recovery Trust Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 52,000 | 50,000
Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 | 0
Assets Held-in-trust, Current |  | 0 |
Liabilities at fair value on a recurring basis |  |  |
Total |  |  | 0
Assets, Fair Value Disclosure |  | 1,189,000 | 1,094,000
Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Power Contracts Liabilities [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  |  | 0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 1,189,000 | 1,094,000
Fair Value, Inputs, Level 2 [Member] | Power Contracts Assets [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Storm Reserve Escrow Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Securitization Recovery Trust Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 | 0
Assets Held-in-trust, Current |  | 0 |
Liabilities at fair value on a recurring basis |  |  |
Total |  |  | 6,000
Assets, Fair Value Disclosure |  | 192,000 | 218,000
Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Power Contracts Liabilities [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  |  | 6,000
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Power Contracts Assets [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 183,000 | 195,000
Fair Value, Inputs, Level 3 [Member] | Storm Reserve Escrow Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Securitization Recovery Trust Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 9,000 | 23,000
Entergy Louisiana [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets Held-in-trust, Current |  | 196,568 | 0
Assets other than temporary cash investments |  | 1,065,200 | 1,042,300
Entergy Louisiana [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 100,000 | 34,800
Assets Held-in-trust, Current |  | 196,600 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 1,678,700 | 1,379,200
Entergy Louisiana [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 7,600 | 7,000
Entergy Louisiana [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 8,500 | 7,100
Entergy Louisiana [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 422,200 | 409,900
Entergy Louisiana [Member] | Common trust funds valued using Net Asset Value [Domain] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 634,500 | 625,300
Entergy Louisiana [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 304,900 | 290,400
Entergy Louisiana [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 8,700 | 3,200
Entergy Louisiana [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 3,300 | 8,500
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 100,000 | 34,800
Assets Held-in-trust, Current |  | 196,600 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 773,200 | 496,600
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 7,600 | 7,000
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 8,500 | 7,100
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 154,500 | 161,100
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 304,900 | 290,400
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 8,700 | 3,200
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 | 0
Assets Held-in-trust, Current |  | 0 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 267,700 | 248,800
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 267,700 | 248,800
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 | 0
Assets Held-in-trust, Current |  | 0 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 3,300 | 8,500
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 3,300 | 8,500
Entergy Arkansas [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 785,500 | 771,300
Entergy Arkansas [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 13,400 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 829,500 | 795,600
Entergy Arkansas [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 5,200 | 3,000
Entergy Arkansas [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 311,200 | 303,900
Entergy Arkansas [Member] | Common trust funds valued using Net Asset Value [Domain] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 469,100 | 464,400
Entergy Arkansas [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 19,300 | 12,200
Entergy Arkansas [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 7,600 | 4,200
Entergy Arkansas [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 3,700 | 7,900
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 13,400 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 147,800 | 129,900
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 5,200 | 3,000
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 102,300 | 110,500
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 19,300 | 12,200
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 7,600 | 4,200
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 208,900 | 193,400
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 208,900 | 193,400
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 3,700 | 7,900
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [3] | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 3,700 | 7,900
Entergy Mississippi [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 112,700 | 144,200
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 155,400 | 188,300
Entergy Mississippi [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 1,800 | 1,300
Entergy Mississippi [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 41,800 | 41,700
Entergy Mississippi [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 900 | 2,400
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 112,700 | 144,200
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 154,500 | 185,900
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 1,800 | 1,300
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 41,800 | 41,700
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 | 0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 | 0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 900 | 2,400
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 900 | 2,400
Entergy New Orleans [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 5,300 | 87,800
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 101,500 | 174,900
Entergy New Orleans [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  |  | 500
Entergy New Orleans [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 88,200 | 81,000
Entergy New Orleans [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 7,400 | 4,600
Entergy New Orleans [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 600 | 1,500
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 5,300 | 87,800
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 100,900 | 173,400
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  |  | 500
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 88,200 | 81,000
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 7,400 | 4,600
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 | 0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  |  | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 | 0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 600 | 1,500
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  |  | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Storm Reserve Escrow Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 600 | 1,500
Entergy Texas [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 64,800 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 93,600 | 40,400
Entergy Texas [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 27,900 | 38,200
Entergy Texas [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 900 | 2,200
Entergy Texas [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 64,800 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 92,700 | 38,200
Entergy Texas [Member] | Fair Value Inputs Level 1 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 27,900 | 38,200
Entergy Texas [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 900 | 2,200
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Securitization Recovery Trust Account [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 900 | 2,200
System Energy [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 719,800 | 701,500
System Energy [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 255,000 | 222,000
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 974,800 | 923,500
System Energy [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 2,100 | 1,800
System Energy [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 291,400 | 277,800
System Energy [Member] | Common trust funds valued using Net Asset Value [Domain] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 426,300 | 421,900
System Energy [Member] | Fair Value Inputs Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 255,000 | 222,000
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 489,700 | 442,400
System Energy [Member] | Fair Value Inputs Level 1 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 2,100 | 1,800
System Energy [Member] | Fair Value Inputs Level 1 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 232,600 | 218,600
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 | 0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 58,800 | 59,200
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 0 | 0
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 58,800 | 59,200
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0 | 0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 0 | 0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | $ 0 | $ 0
[1] | (a)The decommissioning trust funds hold equity and fixed income securities. Equity securities are invested to approximate the returns of major market indices. Fixed income securities are held in various governmental and corporate securities. See Note 9 to the financial statements for additional information on the investment portfolios.
[2] | (b)Common trust funds are not publicly quoted, and are valued by the fund administrators using net asset value (NAV) as a practical expedient. Accordingly, these funds are not assigned a level in the fair value table. The fund administrator of these investments allows daily trading at the NAV and trades settle at a later date.
[3] | (a)The decommissioning trust funds hold equity and fixed income securities. Equity securities are invested to approximate the returns of major market indices. Fixed income securities are held in various governmental and corporate securities. See Note 9 to the financial statements for additional information on the investment portfolios.(b)Common trust funds are not publicly quoted, and are valued by the fund administrators using net asset value (NAV) as a practical expedient. Accordingly, these funds are not assigned a level in the fair value table. The fund administrator of these investments allows daily trading at the NAV and trades settle at a later date.

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