Decommissioning Trust Funds (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jun. 28, 2022
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 1,885.0	$ 1,852.0
Average Coupon Rate of Debt Securities Percentage	3.48%
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 661.0	889.0	$ 1,465.0
Average Duration of Debt Securities in Years	6 years 4 months 9 days
Average Maturity of Debt Securities, Years	10 years 9 months 25 days
Debt Securities, Available-for-Sale, Realized Gain	$ 1.0	2.0	29.0
Debt Securities, Available-for-Sale, Realized Loss	37.0	46.0	17.0
Equity Securities, FV-NI, Unrealized Gain	591.0
Entergy Arkansas [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 548.1	539.8
Average Coupon Rate of Debt Securities Percentage	2.66%
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 28.5	42.1	57.6
Average Duration of Debt Securities in Years	6 years 7 days
Average Maturity of Debt Securities, Years	7 years 7 months 20 days
Debt Securities, Available-for-Sale, Realized Gain	$ 0.1	0.1	2.5
Debt Securities, Available-for-Sale, Realized Loss	2.0	2.6	0.6
Equity Securities, FV-NI, Unrealized Gain	$ 175.0
Entergy Louisiana [Member]
Percentage Interest in River Bend	30.00%
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 813.9	789.1
Average Coupon Rate of Debt Securities Percentage	3.91%
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 318.6	362.2	303.4
Average Duration of Debt Securities in Years	6 years 6 months 10 days
Average Maturity of Debt Securities, Years	13 years 1 month 28 days
Debt Securities, Available-for-Sale, Realized Gain	$ 0.5	1.3	6.8
Debt Securities, Available-for-Sale, Realized Loss	20.9	23.0	4.1
Equity Securities, FV-NI, Unrealized Loss	251.3
System Energy [Member]
Decommissioning Trust Funds (Textual) [Abstract]
Debt Securities, Available-for-Sale, Amortized Cost	$ 523.2	522.7
Average Coupon Rate of Debt Securities Percentage	3.63%
Proceeds from Sale of Debt Securities, Available-for-Sale	$ 314.3	209.4	513.8
Average Duration of Debt Securities in Years	6 years 5 months 8 days
Average Maturity of Debt Securities, Years	10 years 3 months 7 days
Debt Securities, Available-for-Sale, Realized Gain	$ 0.6	0.2	9.3
Debt Securities, Available-for-Sale, Realized Loss	14.2	$ 10.7	$ 4.0
Equity Securities, FV-NI, Unrealized Loss	$ 164.2
Palisades [Member]
Decommissioning Fund Investments, Fair Value				$ 552.0

Average coupon rate of debt securities percentage.

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Decommissioning Trust Funds.

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Percentage Interest in River Bend

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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