Decommissioning Trust Funds (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Jun. 28, 2022
Debt Securities, Available-for-Sale, Amortized Cost	$ 2,121.0	$ 1,885.0
Average Coupon Rate of Debt Securities Percentage	4.04%
Average Duration of Debt Securities in Years	6 years 4 months 6 days
Average Maturity of Debt Securities, Years	11 years 18 days
Equity Securities, FV-NI, Unrealized Gain	$ 616.0
Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss	0.0	0.0
Entergy Arkansas [Member]
Debt Securities, Available-for-Sale, Amortized Cost	$ 603.5	548.1
Average Coupon Rate of Debt Securities Percentage	3.72%
Average Duration of Debt Securities in Years	6 years 3 months 21 days
Average Maturity of Debt Securities, Years	8 years 7 months 28 days
Equity Securities, FV-NI, Unrealized Gain	$ 177.0
Entergy Louisiana [Member]
Percentage Interest in River Bend	30.00%
Debt Securities, Available-for-Sale, Amortized Cost	$ 931.5	813.9
Average Coupon Rate of Debt Securities Percentage	4.32%
Average Duration of Debt Securities in Years	6 years 6 months
Average Maturity of Debt Securities, Years	12 years 11 months 19 days
Equity Securities, FV-NI, Unrealized Loss	$ 277.8
System Energy [Member]
Debt Securities, Available-for-Sale, Amortized Cost	$ 585.5	$ 523.2
Average Coupon Rate of Debt Securities Percentage	3.94%
Average Duration of Debt Securities in Years	6 years 1 month 17 days
Average Maturity of Debt Securities, Years	10 years 5 months 8 days
Equity Securities, FV-NI, Unrealized Loss	$ 161.1
Palisades [Member]
Decommissioning Fund Investments, Fair Value			$ 552.0