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Decommissioning Trust Funds (Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value	$ 361.0	$ 1,102.0
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	549.0	510.0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	910.0	1,612.0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	3.0	24.0
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	42.0	56.0
Debt Securities, Available-for-Sale, Unrealized Loss Position	45.0	80.0
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	89.1	282.8
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	211.1	195.0
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	300.2	477.8
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	0.6	8.2
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	13.6	17.6
Debt Securities, Available-for-Sale, Unrealized Loss Position	14.2	25.8
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	179.8	543.8
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	196.6	178.4
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	376.4	722.2
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	1.6	8.8
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	13.4	18.1
Debt Securities, Available-for-Sale, Unrealized Loss Position	15.0	26.9
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	91.9	275.6
Debt Securities, Held-to-Maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value	141.7	136.8
Debt Securities, Held-to-Maturity, Unrealized Loss Position, Fair Value	233.6	412.4
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months	1.1	6.8
Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer	15.1	20.8
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 16.2	$ 27.6

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