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Decommissioning Trust Funds (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022 | Jun. 28, 2022
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts | $ 0 | $ 3,768,000 | $ 0 | $ (3,453,000) |  |
Amortized cost of debt securities | $ 1,874,000,000 |  | $ 1,874,000,000 |  | $ 1,852,000,000 |
Average coupon rate of debt securities | 3.15% |  | 3.15% |  |  |
Average duration of debt securities, years |  |  | 6 years 4 months 17 days |  |  |
Average maturity of debt securities, years |  |  | 10 years 9 months 21 days |  |  |
Proceeds from the dispositions of debt securities | $ 136,000,000 | 333,000,000 | $ 260,000,000 | 636,000,000 |  |
Equity Securities, FV-NI, Unrealized Loss | 211,000,000 |  | 372,000,000 |  |  |
Debt Securities, Available-for-sale, Realized Gain |  | 1,000,000 | 1,000,000 | 2,000,000 |  |
Debt Securities, Available-for-sale, Realized Loss | 8,000,000 | 16,000,000 | 17,000,000 | 28,000,000 |  |
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale |  |  |  | 1,500,000 |  |
Debt Securities [Member] |  |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Deferred taxes on unrealized gains/(losses) recorded in OCI for non-regulated decommissioning trusts |  |  | 0 |  | 0 |
Entergy Arkansas [Member] |  |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Amortized cost of debt securities | $ 546,800,000 |  | $ 546,800,000 |  | 539,800,000 |
Average coupon rate of debt securities | 2.46% |  | 2.46% |  |  |
Average duration of debt securities, years |  |  | 5 years 11 months 8 days |  |  |
Average maturity of debt securities, years |  |  | 7 years 5 months 4 days |  |  |
Proceeds from the dispositions of debt securities | $ 900,000 | 8,800,000 | $ 16,600,000 | 15,900,000 |  |
Equity Securities, FV-NI, Unrealized Loss | 62,100,000 |  | 109,400,000 |  |  |
Debt Securities, Available-for-sale, Realized Gain | 0 | 30,000.00 | 0 | 60,000.00 |  |
Debt Securities, Available-for-sale, Realized Loss | 100,000 | 300,000 | 1,700,000 | 500,000 |  |
Entergy Louisiana [Member] |  |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Amortized cost of debt securities | $ 804,000,000 |  | $ 804,000,000 |  | 789,100,000 |
Average coupon rate of debt securities | 3.69% |  | 3.69% |  |  |
Average duration of debt securities, years |  |  | 6 years 6 months 14 days |  |  |
Average maturity of debt securities, years |  |  | 13 years 1 month 6 days |  |  |
Proceeds from the dispositions of debt securities | $ 65,200,000 | 120,300,000 | $ 132,600,000 | 240,900,000 |  |
Percentage Interest in River Bend |  |  | 30.00% |  |  |
Equity Securities, FV-NI, Unrealized Loss | 90,300,000 |  | $ 159,600,000 |  |  |
Debt Securities, Available-for-sale, Realized Gain | 100,000 | 200,000 | 500,000 | 1,100,000 |  |
Debt Securities, Available-for-sale, Realized Loss | 4,000,000 | 6,700,000 | 9,000,000 | 12,200,000 |  |
System Energy [Member] |  |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Amortized cost of debt securities | $ 523,400,000 |  | $ 523,400,000 |  | $ 522,700,000 |
Average coupon rate of debt securities | 2.97% |  | 2.97% |  |  |
Average duration of debt securities, years |  |  | 6 years 6 months 21 days |  |  |
Average maturity of debt securities, years |  |  | 10 years 6 months 29 days |  |  |
Proceeds from the dispositions of debt securities | $ 69,900,000 | 67,800,000 | $ 111,200,000 | 104,000,000 |  |
Equity Securities, FV-NI, Unrealized Loss | 58,400,000 |  | 102,800,000 |  |  |
Debt Securities, Available-for-sale, Realized Gain | 0 | 100,000 | 0 | 200,000 |  |
Debt Securities, Available-for-sale, Realized Loss | $ 4,100,000 | $ 4,600,000 | $ 6,300,000 | $ 5,300,000 |  |
Palisades [Member] |  |  |  |  |  |
Decommissioning Trust Funds [Abstract] |  |  |  |  |  |
Decommissioning Fund Investments, Fair Value |  |  |  |  |  | $ 552,000,000

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