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Decommissioning Trust Funds (Securities Held) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Total | $ 1,692.0 | $ 2,177.0
Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position | 157.0 | 12.0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4.0 | 65.0
Total | 1,692.0 | 2,177.0
Entergy Arkansas [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 484.8 | 526.3
Entergy Arkansas [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position | 52.2 | 4.7
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.2 | 11.4
Total | 484.8 | 526.3
Entergy Louisiana [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 733.3 | 794.2
Entergy Louisiana [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position | 56.0 | 3.3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3.2 | 31.3
Total | 733.3 | 794.2
System Energy [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total | 474.3 | 524.5
System Energy [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Unrealized Loss Position | 49.2 | 2.9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0.2 | 11.8
Total | $ 474.3 | $ 524.5

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