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Risk Management and Fair Values (Assets And Liabilities At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | $ 1,148.0 | $ 725.0
Assets other than temporary cash investments |  |  | 7,212.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 8,797.0 | 8,414.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  |  | 76.0
Gas Hedge Contracts [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 1.0 | 6.0
Power Contracts Liabilities [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  |  | 70.0
Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 577.0 | 526.0
Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 2,619.0 | 2,550.0
Common trust funds valued using Net Asset Value [Domain] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 3,920.0 | 4,136.0
Power Contracts Assets [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 75.0 | 5.0
Storm Reserve Escrow Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 398.0 | 406.0
Securitization Recovery Trust Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 52.0 | 45.0
Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 8.0 | 21.0
Fair Value Inputs Level 1 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 1,148.0 | 725.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 3,259.0 | 2,827.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  |  | 6.0
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 |  | 1.0 | 6.0
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 |  |  | 0.0
Fair Value Inputs Level 1 [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 577.0 | 526.0
Fair Value Inputs Level 1 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 1,084.0 | 1,125.0
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 | 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 |  | 398.0 | 406.0
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 |  | 52.0 | 45.0
Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Fair Value, Inputs, Level 2 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 1,535.0 | 1,425.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  |  | 0.0
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 | 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 |  |  | 0.0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 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 |  | 1,535.0 | 1,425.0
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 | 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 | 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 | 0.0
Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Fair Value, Inputs, Level 3 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 83.0 | 26.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure |  |  | 70.0
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 | 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 |  |  | 70.0
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 | 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 | 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 |  | 75.0 | 5.0
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 | 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 | 0.0
Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 8.0 | 21.0
Entergy Mississippi [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.3 | 4.5
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 33.3 | 38.6
Entergy Mississippi [Member] | Gas Hedge Contracts [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0.2 | 1.2
Entergy Mississippi [Member] | Storm Reserve Escrow Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 32.1 | 32.0
Entergy Mississippi [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.9 | 2.1
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.3 | 4.5
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 32.4 | 36.5
Entergy Mississippi [Member] | 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 |  | 0.2 | 1.2
Entergy Mississippi [Member] | 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 |  | 32.1 | 32.0
Entergy Mississippi [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 0.0 | 0.0
Entergy Mississippi [Member] | 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 | 0.0
Entergy Mississippi [Member] | 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 | 0.0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 0.9 | 2.1
Entergy Mississippi [Member] | 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 | 0.0
Entergy Mississippi [Member] | 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 | 0.0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.9 | 2.1
Entergy Louisiana [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 561.9 | 30.1
Assets other than temporary cash investments |  |  | 1,312.1
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 2,164.8 | 1,643.9
Entergy Louisiana [Member] | Gas Hedge Contracts [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 1.2 | 5.0
Entergy Louisiana [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 12.2 | 15.2
Entergy Louisiana [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 516.3 | 493.8
Entergy Louisiana [Member] | Common trust funds valued using Net Asset Value [Domain] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 775.9 | 803.1
Entergy Louisiana [Member] | Storm Reserve Escrow Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 285.6 | 289.5
Entergy Louisiana [Member] | Securitization Recovery Trust Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 9.5 | 2.0
Entergy Louisiana [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 3.4 | 10.2
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 561.9 | 30.1
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 1,014.8 | 480.1
Entergy Louisiana [Member] | 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 |  | 1.2 | 5.0
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 12.2 | 15.2
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 145.6 | 143.3
Entergy Louisiana [Member] | 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 |  | 285.6 | 289.5
Entergy Louisiana [Member] | 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 |  | 9.5 | 2.0
Entergy Louisiana [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 370.7 | 350.5
Entergy Louisiana [Member] | 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 | 0.0
Entergy Louisiana [Member] | 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 | 0.0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 370.7 | 350.5
Entergy Louisiana [Member] | 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 | 0.0
Entergy Louisiana [Member] | 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 | 0.0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 3.4 | 10.2
Entergy Louisiana [Member] | 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 | 0.0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 0.0 | 0.0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 0.0 | 0.0
Entergy Louisiana [Member] | 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 | 0.0
Entergy Louisiana [Member] | 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 | 0.0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 3.4 | 10.2
Entergy Arkansas [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  |  | 944.9
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 945.4 | 954.0
Entergy Arkansas [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 3.6 | 11.7
Entergy Arkansas [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 350.8 | 348.2
Entergy Arkansas [Member] | Common trust funds valued using Net Asset Value [Domain] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 581.3 | 585.0
Entergy Arkansas [Member] | Storm Reserve Escrow Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  |  | 2.4
Entergy Arkansas [Member] | Securitization Recovery Trust Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 7.9 | 3.7
Entergy Arkansas [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 1.8 | 3.0
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 122.8 | 133.6
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 3.6 | 11.7
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 111.3 | 115.8
Entergy Arkansas [Member] | 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 |  |  | 2.4
Entergy Arkansas [Member] | 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 |  | 7.9 | 3.7
Entergy Arkansas [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 239.5 | 232.4
Entergy Arkansas [Member] | 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 | 0.0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 239.5 | 232.4
Entergy Arkansas [Member] | 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
Entergy Arkansas [Member] | 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 | 0.0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 1.8 | 3.0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 0.0 | 0.0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 0.0 | 0.0
Entergy Arkansas [Member] | 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
Entergy Arkansas [Member] | 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 | 0.0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 1.8 | 3.0
Entergy New Orleans [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 1.3 | 32.7
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 86.6 | 118.3
Entergy New Orleans [Member] | Gas Hedge Contracts [Member] |  |  |
Liabilities at fair value on a recurring basis |  |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  |  | 0.2
Entergy New Orleans [Member] | Storm Reserve Escrow Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 79.8 | 81.9
Entergy New Orleans [Member] | Securitization Recovery Trust Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 4.8 | 1.5
Entergy New Orleans [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.7 | 2.2
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 1.3 | 32.7
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 85.9 | 116.1
Entergy New Orleans [Member] | 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 |  |  | 0.2
Entergy New Orleans [Member] | 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 |  | 79.8 | 81.9
Entergy New Orleans [Member] | 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 |  | 4.8 | 1.5
Entergy New Orleans [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 0.0 | 0.0
Entergy New Orleans [Member] | 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
Entergy New Orleans [Member] | 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 | 0.0
Entergy New Orleans [Member] | 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 | 0.0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 0.7 | 2.2
Entergy New Orleans [Member] | 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
Entergy New Orleans [Member] | 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 | 0.0
Entergy New Orleans [Member] | 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 | 0.0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.7 | 2.2
Entergy Texas [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 39.0 | 115.5
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 70.1 | 156.6
Entergy Texas [Member] | Securitization Recovery Trust Account [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 29.7 | 37.7
Entergy Texas [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 1.4 | 3.4
Entergy Texas [Member] | Fair Value Inputs Level 1 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 39.0 | 115.5
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 68.7 | 153.2
Entergy Texas [Member] | 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 |  | 29.7 | 37.7
Entergy Texas [Member] | Fair Value Inputs Level 1 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 0.0 | 0.0
Entergy Texas [Member] | 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 | 0.0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 0.0 | 0.0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 1.4 | 3.4
Entergy Texas [Member] | 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 | 0.0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments |  | 1.4 | 3.4
System Energy [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 278.7 | 287.1
Assets other than temporary cash investments |  |  | 905.7
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 1,174.9 | 1,192.8
System Energy [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 2.3 | 3.1
System Energy [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 325.6 | 330.5
System Energy [Member] | Common trust funds valued using Net Asset Value [Domain] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 568.3 | 572.1
System Energy [Member] | Fair Value Inputs Level 1 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 278.7 | 287.1
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 453.5 | 477.4
System Energy [Member] | Fair Value Inputs Level 1 [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 2.3 | 3.1
System Energy [Member] | Fair Value Inputs Level 1 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 172.5 | 187.2
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 153.1 | 143.3
System Energy [Member] | 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 | 0.0
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 153.1 | 143.3
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Temporary cash investments |  | 0.0 | 0.0
Liabilities at fair value on a recurring basis |  |  |
Assets, Fair Value Disclosure |  | 0.0 | 0.0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | 0.0 | 0.0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |  |
Assets at fair value on a recurring basis |  |  |
Assets other than temporary cash investments | [1] | $ 0.0 | $ 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 herein 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 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 net asset value and trades settle at a later date.

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