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Decommissioning Trust Funds (Available For Sale Securities Continuous Unrealized Loss Position Fair Value) (Details) - Debt Securities [Member] - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
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Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | $ 1,357.0 | $ 770.0
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 123.0 | 99.0
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 1,480.0 | 869.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 134.0 | 8.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 23.0 | 4.0
Debt Securities, Available-for-sale, Unrealized Loss Position | 157.0 | 12.0
Entergy Arkansas [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 384.2 | 183.8
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 64.2 | 39.5
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 448.4 | 223.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 40.8 | 2.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 11.4 | 1.8
Debt Securities, Available-for-sale, Unrealized Loss Position | 52.2 | 4.7
Entergy Louisiana [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 528.8 | 206.9
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 41.8 | 42.9
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 570.6 | 249.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 48.5 | 1.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 7.5 | 1.9
Debt Securities, Available-for-sale, Unrealized Loss Position | 56.0 | 3.3
System Energy [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value | 443.6 | 276.6
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value | 16.7 | 11.3
Debt Securities, Held-to-maturity, Unrealized Loss Position, Fair Value | 460.3 | 287.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 45.1 | 2.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 4.1 | 0.6
Debt Securities, Available-for-sale, Unrealized Loss Position | $ 49.2 | $ 2.9

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