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Decommissioning Trust Funds (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Jun. 28, 2022
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts | $ 3,768 | $ (27) | $ (3,453) | $ (25,608) |  |
Amortized cost of debt securities | $ 1,846,000 |  | $ 1,846,000 |  | $ 2,125,000 |
Average coupon rate of debt securities | 2.86% |  | 2.86% |  |  |
Average duration of debt securities, years |  |  | 6 years 6 months 25 days |  |  |
Average maturity of debt securities, years |  |  | 10 years 2 months 4 days |  |  |
Proceeds from the dispositions of debt securities | $ 333,000 | 273,000 | $ 636,000 | 797,000 |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss |  |  |  |  | 400 |
Equity Securities, FV-NI, Unrealized Loss | (481,000) |  | (647,000) |  |  |
Debt Securities, Available-for-sale, Realized Gain | 1,000 | 6,000 | 2,000 | 17,000 |  |
Debt Securities, Available-for-sale, Realized Loss | 16,000 | 1,000 | 28,000 | 12,000 |  |
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale |  |  | 1,500 |  |  |
Debt Securities [Member] |  |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts |  |  | (1,000) |  | 2,000 |
Entergy Arkansas [Member] |  |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Amortized cost of debt securities | $ 536,800 |  | $ 536,800 |  | 519,600 |
Average coupon rate of debt securities | 2.27% |  | 2.27% |  |  |
Average duration of debt securities, years |  |  | 6 years 2 months 19 days |  |  |
Average maturity of debt securities, years |  |  | 7 years 6 months 10 days |  |  |
Proceeds from the dispositions of debt securities | $ 8,800 | 12,300 | $ 15,900 | 26,100 |  |
Equity Securities, FV-NI, Unrealized Loss | (143,500) |  | (193,900) |  |  |
Debt Securities, Available-for-sale, Realized Gain | 30 | 700 | 60 | 1,600 |  |
Debt Securities, Available-for-sale, Realized Loss | 300 | 100 | 500 | 100 |  |
Entergy Louisiana [Member] |  |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Amortized cost of debt securities | $ 786,100 |  | $ 786,100 |  | 766,300 |
Average coupon rate of debt securities | 3.50% |  | 3.50% |  |  |
Average duration of debt securities, years |  |  | 6 years 9 months 10 days |  |  |
Average maturity of debt securities, years |  |  | 12 years 4 months 2 days |  |  |
Proceeds from the dispositions of debt securities | $ 120,300 | 62,500 | $ 240,900 | 170,900 |  |
Percentage Interest in River Bend |  |  | 30.00% |  |  |
Equity Securities, FV-NI, Unrealized Loss | (202,900) |  | $ (271,600) |  |  |
Debt Securities, Available-for-sale, Realized Gain | 200 | 1,500 | 1,100 | 4,800 |  |
Debt Securities, Available-for-sale, Realized Loss | 6,700 | 100 | 12,200 | 3,300 |  |
System Energy [Member] |  |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Amortized cost of debt securities | $ 523,200 |  | $ 523,200 |  | 515,600 |
Average coupon rate of debt securities | 2.46% |  | 2.46% |  |  |
Average duration of debt securities, years |  |  | 6 years 7 months 9 days |  |  |
Average maturity of debt securities, years |  |  | 9 years 6 months 3 days |  |  |
Proceeds from the dispositions of debt securities | $ 67,800 | 101,600 | $ 104,000 | 175,700 |  |
Equity Securities, FV-NI, Unrealized Loss | (134,600) |  | (181,800) |  |  |
Debt Securities, Available-for-sale, Realized Gain | 100 | 1,900 | 200 | 3,100 |  |
Debt Securities, Available-for-sale, Realized Loss | $ 4,600 | $ 200 | $ 5,300 | $ 1,800 |  |
Palisades [Member] |  |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Decommissioning Fund Investments, Fair Value |  |  |  |  | $ 576,000 | $ 552,000

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