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Decommissioning Trust Funds (Debt Securities, Available-for-Sale) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Debt Securities, Available-for-Sale	$ 2,202.0	$ 2,047.0
Debt Securities, Available-for-Sale, Unrealized Gain	28.0	7.0
Debt Securities, Available-for-Sale, Unrealized Loss	45.0	80.0
Debt Securities, Available-for-Sale, Unrealized Loss Position	45.0	80.0
Entergy Louisiana [Member]
Debt Securities, Available-for-Sale [Line Items]
Debt Securities, Available-for-Sale	992.6	908.1
Debt Securities, Available-for-Sale, Unrealized Gain	13.0	3.6
Debt Securities, Available-for-Sale, Unrealized Loss	15.0	26.9
Debt Securities, Available-for-Sale, Unrealized Loss Position	15.0	26.9
Entergy Arkansas [Member]
Debt Securities, Available-for-Sale [Line Items]
Debt Securities, Available-for-Sale	614.0	579.0
Debt Securities, Available-for-Sale, Unrealized Gain	7.5	1.2
Debt Securities, Available-for-Sale, Unrealized Loss	14.2	25.8
Debt Securities, Available-for-Sale, Unrealized Loss Position	14.2	25.8
System Energy [Member]
Debt Securities, Available-for-Sale [Line Items]
Debt Securities, Available-for-Sale	595.0	559.8
Debt Securities, Available-for-Sale, Unrealized Gain	7.4	1.9
Debt Securities, Available-for-Sale, Unrealized Loss	16.2	27.6
Debt Securities, Available-for-Sale, Unrealized Loss Position	$ 16.2	$ 27.6

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