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Risk Management and Fair Values (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | $ 1,272,314 | $ 60,939
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 4,000 |
Replacement Reserve Escrow | 333,000 | 323,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 6,923,000 | 5,277,000
Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 2,000 | 11,000
Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 1,922,000 | 1,770,000
Common trust funds valued using Net Asset Value [Domain] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 3,289,000 | 3,070,000
Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 49,000 | 21,000
Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 54,000 | 24,000
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 1,272,000 | 61,000
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 4,000 | 8,000
Replacement Reserve Escrow | 333,000 | 323,000
Equity Securities, FV-NI, Current | 54,000 | 24,000
Debt Securities | 721,000 | 611,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 2,384,000 | 1,027,000
Fair Value, Inputs, Level 1 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 2,000 | 11,000
Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 0
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 0 | 0
Replacement Reserve Escrow | 0 | 0
Equity Securities, FV-NI, Current | 0 | 0
Debt Securities | 1,201,000 | 1,159,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 1,201,000 | 1,159,000
Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 0
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 0 | 0
Replacement Reserve Escrow | 0 | 0
Equity Securities, FV-NI, Current | 0 | 0
Debt Securities | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 49,000 | 21,000
Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 49,000 | 21,000
Entergy New Orleans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 6,532 | 0
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 1,306 | 2,426
Replacement Reserve Escrow | 81,700 | 78,700
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 92,100 | 82,200
Entergy New Orleans [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 600
Entergy New Orleans [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 2,600 | 1,100
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 6,500 |
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 1,300 | 2,400
Replacement Reserve Escrow | 81,700 | 78,700
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 89,500 | 81,100
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 600
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 |
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 0 | 0
Replacement Reserve Escrow | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 |
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 0 | 0
Replacement Reserve Escrow | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 2,600 | 1,100
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 2,600 | 1,100
Entergy Mississippi [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 3,083 | 6,600
Assets, Fair Value Disclosure [Abstract] |  |
Replacement Reserve Escrow | 800 | 700
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 7,500 | 8,700
Entergy Mississippi [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 1,500 | 10,100
Entergy Mississippi [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 3,600 | 1,400
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 3,100 | 6,600
Assets, Fair Value Disclosure [Abstract] |  |
Replacement Reserve Escrow | 800 | 700
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 3,900 | 7,300
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 1,500 | 10,100
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 0
Assets, Fair Value Disclosure [Abstract] |  |
Replacement Reserve Escrow | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 0
Assets, Fair Value Disclosure [Abstract] |  |
Replacement Reserve Escrow | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 3,600 | 1,400
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 3,600 | 1,400
Entergy Louisiana [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 185,307 | 517
Assets, Fair Value Disclosure [Abstract] |  |
Replacement Reserve Escrow | 250,400 | 243,800
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 2,747,700 | 2,361,500
Entergy Louisiana [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 400
Entergy Louisiana [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 812,600 | 788,100
Entergy Louisiana [Member] | Common trust funds valued using Net Asset Value [Domain] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 1,461,000 | 1,304,700
Entergy Louisiana [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 19,800 | 9,800
Entergy Louisiana [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 18,600 | 14,600
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 185,300 | 500
Assets, Fair Value Disclosure [Abstract] |  |
Replacement Reserve Escrow | 250,400 | 243,800
Equity Securities, FV-NI, Current | 18,600 | 14,600
Debt Securities | 293,700 | 271,700
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 748,000 | 530,600
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 400
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 0
Assets, Fair Value Disclosure [Abstract] |  |
Replacement Reserve Escrow | 0 | 0
Equity Securities, FV-NI, Current | 0 | 0
Debt Securities | 518,900 | 516,400
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 518,900 | 516,400
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 0
Assets, Fair Value Disclosure [Abstract] |  |
Replacement Reserve Escrow | 0 | 0
Equity Securities, FV-NI, Current | 0 | 0
Debt Securities | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 19,800 | 9,800
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Gas Hedge Contracts [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 19,800 | 9,800
Entergy Arkansas [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 772,164 | 3,112
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 2,310,800 | 1,423,100
Entergy Arkansas [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 554,400 | 496,900
Entergy Arkansas [Member] | Common trust funds valued using Net Asset Value [Domain] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 935,000 | 910,700
Entergy Arkansas [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 16,100 | 6,000
Entergy Arkansas [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 33,100 | 6,400
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 772,200 | 3,100
Assets, Fair Value Disclosure [Abstract] |  |
Equity Securities, FV-NI, Current | 33,100 | 6,400
Debt Securities | 165,100 | 129,900
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 970,400 | 139,400
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 0
Assets, Fair Value Disclosure [Abstract] |  |
Equity Securities, FV-NI, Current | 0 | 0
Debt Securities | 389,300 | 367,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 389,300 | 367,000
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 0
Assets, Fair Value Disclosure [Abstract] |  |
Equity Securities, FV-NI, Current | 0 | 0
Debt Securities | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 16,100 | 6,000
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 16,100 | 6,000
Entergy Texas [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 124,880 | 20,489
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 2,340 | 5,195
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 133,800 | 28,100
Entergy Texas [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 6,600 | 2,400
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 124,900 | 20,500
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 2,300 | 5,200
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 127,200 | 25,700
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 0
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 0
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 6,600 | 2,400
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial Transmission Rights (FTRs) [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 6,600 | 2,400
System Energy [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 30,838 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 1,481,100 | 1,342,300
System Energy [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 554,600 | 485,200
System Energy [Member] | Common trust funds valued using Net Asset Value [Domain] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 893,700 | 854,400
System Energy [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 2,000 | 2,700
System Energy [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 30,800 |
Assets, Fair Value Disclosure [Abstract] |  |
Equity Securities, FV-NI, Current | 2,000 | 2,700
Debt Securities | 262,300 | 209,500
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 295,100 | 212,200
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 |
Assets, Fair Value Disclosure [Abstract] |  |
Equity Securities, FV-NI, Current | 0 | 0
Debt Securities | 292,300 | 275,700
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 292,300 | 275,700
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 |
Assets, Fair Value Disclosure [Abstract] |  |
Equity Securities, FV-NI, Current | 0 | 0
Debt Securities | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | $ 0 | 0
Entergy Corporation [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Restricted Cash and Cash Equivalents, Current |  | $ 8,000

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 + Details
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- Definition The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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