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Risk Management and Fair Values (Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | $ 1,434,260 | $ 811,279
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 7,973,000 | 6,740,000
Cash and Cash Equivalents, Fair Value Disclosure | 1,434,000 | 811,000
Asset Recovery Damaged Property Costs, Noncurrent | 306,651 | 340,460
Prepaid Expenses and Other Current Assets |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Restricted Assets, Current | 9,000 | 4,000
Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 2,155,000 | 2,047,000
Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 54,000 | 30,000
Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 30,000 | 20,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 1,000
Natural Gas Swaps |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset |  | 2,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 5,000 |
Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 2,703,000 | 2,035,000
Cash and Cash Equivalents, Fair Value Disclosure | 1,434,000 | 811,000
Other Restricted Assets, Current | 9,000 | 4,000
Asset Recovery Damaged Property Costs, Noncurrent | 307,000 | 340,000
Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 899,000 | 848,000
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 54,000 | 30,000
Fair Value, Inputs, Level 1 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0
Fair Value, Inputs, Level 1 [Member] | Natural Gas Swaps |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset |  | 2,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 0 |
Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 1,256,000 | 1,199,000
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Other Restricted Assets, Current | 0 | 0
Asset Recovery Damaged Property Costs, Noncurrent | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 1,256,000 | 1,199,000
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0
Fair Value, Inputs, Level 2 [Member] | Natural Gas Swaps |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset |  | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 0 |
Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 30,000 | 20,000
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Other Restricted Assets, Current | 0 | 0
Asset Recovery Damaged Property Costs, Noncurrent | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 30,000 | 20,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 1,000
Fair Value, Inputs, Level 3 [Member] | Natural Gas Swaps |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset |  | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 5,000 |
Fair Value Measured at Net Asset Value Per Share |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 3,984,000 | 3,486,000
Entergy New Orleans [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 68,477 | 31,403
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 146,600 | 118,000
Cash and Cash Equivalents, Fair Value Disclosure | 68,500 | 31,400
Other Restricted Assets, Current | 0 | 1,611
Asset Recovery Damaged Property Costs, Noncurrent | 75,859 | 83,742
Entergy New Orleans [Member] | Prepaid Expenses and Other Current Assets |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Restricted Assets, Current |  | 1,600
Entergy New Orleans [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 2,200 | 1,300
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 144,400 | 116,700
Cash and Cash Equivalents, Fair Value Disclosure | 68,500 | 31,400
Other Restricted Assets, Current |  | 1,600
Asset Recovery Damaged Property Costs, Noncurrent | 75,900 | 83,700
Entergy New Orleans [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 0 | 0
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Other Restricted Assets, Current |  | 0
Asset Recovery Damaged Property Costs, Noncurrent | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 2,200 | 1,300
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Other Restricted Assets, Current |  | 0
Asset Recovery Damaged Property Costs, Noncurrent | 0 | 0
Entergy New Orleans [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 2,200 | 1,300
Entergy Mississippi [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 327,988 | 155,509
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 328,400 | 157,100
Cash and Cash Equivalents, Fair Value Disclosure | 328,000 | 155,500
Entergy Mississippi [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 400 |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 500
Entergy Mississippi [Member] | Natural Gas Swaps |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset |  | 1,600
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 4,900 |
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 328,000 | 157,100
Cash and Cash Equivalents, Fair Value Disclosure | 328,000 | 155,500
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 1 [Member] | Natural Gas Swaps |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset |  | 1,600
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 0 |
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 0 | 0
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 2 [Member] | Natural Gas Swaps |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset |  | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 0 |
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 400 | 0
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 400 |
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis |  | 500
Entergy Mississippi [Member] | Fair Value, Inputs, Level 3 [Member] | Natural Gas Swaps |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset |  | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Liabilities, Fair Value Disclosure on Recurring Basis | 4,900 |
Entergy Louisiana [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 374,559 | 326,775
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 3,325,100 | 3,021,200
Cash and Cash Equivalents, Fair Value Disclosure | 374,600 | 326,800
Asset Recovery Damaged Property Costs, Noncurrent | 230,792 | 256,718
Entergy Louisiana [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 951,400 | 908,100
Entergy Louisiana [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 29,400 | 14,500
Entergy Louisiana [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 18,400 | 8,600
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 974,400 | 924,000
Cash and Cash Equivalents, Fair Value Disclosure | 374,600 | 326,800
Asset Recovery Damaged Property Costs, Noncurrent | 230,800 | 256,700
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 339,600 | 326,000
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 29,400 | 14,500
Entergy Louisiana [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 611,800 | 582,100
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Asset Recovery Damaged Property Costs, Noncurrent | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 611,800 | 582,100
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 18,400 | 8,600
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Asset Recovery Damaged Property Costs, Noncurrent | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
Entergy Louisiana [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 18,400 | 8,600
Entergy Louisiana [Member] | Fair Value Measured at Net Asset Value Per Share |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 1,720,500 | 1,506,500
Entergy Arkansas [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 465,092 | 3,441
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 2,260,800 | 1,616,300
Cash and Cash Equivalents, Fair Value Disclosure | 465,100 | 3,400
Entergy Arkansas [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 609,300 | 579,000
Entergy Arkansas [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 19,500 | 12,900
Entergy Arkansas [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 8,000 | 8,500
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 759,500 | 276,200
Cash and Cash Equivalents, Fair Value Disclosure | 465,100 | 3,400
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 274,900 | 259,900
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 19,500 | 12,900
Entergy Arkansas [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 334,400 | 319,100
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 334,400 | 319,100
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 8,000 | 8,500
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
Entergy Arkansas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 8,000 | 8,500
Entergy Arkansas [Member] | Fair Value Measured at Net Asset Value Per Share |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 1,158,900 | 1,012,500
Entergy Texas [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 0 | 184,706
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 10,400 | 189,300
Cash and Cash Equivalents, Fair Value Disclosure |  | 184,700
Other Restricted Assets, Current | 9,025 | 2,703
Entergy Texas [Member] | Prepaid Expenses and Other Current Assets |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Other Restricted Assets, Current | 9,000 | 2,700
Entergy Texas [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 1,400 | 1,900
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 9,000 | 187,400
Cash and Cash Equivalents, Fair Value Disclosure |  | 184,700
Other Restricted Assets, Current | 9,000 | 2,700
Entergy Texas [Member] | Fair Value, Inputs, Level 1 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 0 | 0
Cash and Cash Equivalents, Fair Value Disclosure |  | 0
Other Restricted Assets, Current | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 2 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 1,400 | 1,900
Cash and Cash Equivalents, Fair Value Disclosure |  | 0
Other Restricted Assets, Current | 0 | 0
Entergy Texas [Member] | Fair Value, Inputs, Level 3 [Member] | Financial transmission rights |  |
Assets, Fair Value Disclosure [Abstract] |  |
Derivative Asset | 1,400 | 1,900
System Energy [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cash Equivalents, at Carrying Value | 127,330 | 28,460
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 1,831,500 | 1,557,600
Cash and Cash Equivalents, Fair Value Disclosure | 127,300 | 28,500
System Energy [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 594,600 | 559,800
System Energy [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 4,800 | 2,400
System Energy [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 417,000 | 293,300
Cash and Cash Equivalents, Fair Value Disclosure | 127,300 | 28,500
System Energy [Member] | Fair Value, Inputs, Level 1 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 284,900 | 262,400
System Energy [Member] | Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 4,800 | 2,400
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 309,700 | 297,400
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 309,700 | 297,400
System Energy [Member] | Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Assets, Fair Value Disclosure | 0 | 0
Cash and Cash Equivalents, Fair Value Disclosure | 0 | 0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] | Debt Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
System Energy [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | 0 | 0
System Energy [Member] | Fair Value Measured at Net Asset Value Per Share |  |
Assets, Fair Value Disclosure [Abstract] |  |
Decommissioning Fund Investments, Fair Value | $ 1,104,800 | $ 966,900

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- Definition Carrying amount as of the balance sheet date of the portion of the reserved funds established by a utility from customer payments to cover the repair costs of damages from major storms, which repairs are expected to be incurred beyond one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477711/980-340-25-1 + Details
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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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