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Decommissioning Trust Funds (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale, Amortized Cost	$ 2,219.0	$ 2,121.0
Average Coupon Rate of Debt Securities Percentage	4.17%
Average Duration of Debt Securities in Years	6 years 2 months 23 days
Average Maturity of Debt Securities, Years	10 years 6 months 14 days
Deferred Tax Asset, Debt Securities, Available-for-Sale, Unrealized Loss	$ 0.0	0.0
Equity Securities, FV-NI, Unrealized Gain (Loss)	475.0
Entergy Arkansas [Member]
Debt Securities, Available-for-Sale, Amortized Cost	$ 620.7	603.5
Average Coupon Rate of Debt Securities Percentage	3.88%
Average Duration of Debt Securities in Years	6 years 5 months 26 days
Average Maturity of Debt Securities, Years	8 years 10 months 9 days
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 137.5
Entergy Louisiana [Member]
Percentage Interest in River Bend	30.00%
Debt Securities, Available-for-Sale, Amortized Cost	$ 994.6	931.5
Average Coupon Rate of Debt Securities Percentage	4.41%
Average Duration of Debt Securities in Years	6 years 1 month 28 days
Average Maturity of Debt Securities, Years	11 years 11 months 19 days
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 204.0
System Energy [Member]
Debt Securities, Available-for-Sale, Amortized Cost	$ 603.7	$ 585.5
Average Coupon Rate of Debt Securities Percentage	4.08%
Average Duration of Debt Securities in Years	9 years 10 months 20 days
Average Maturity of Debt Securities, Years	6 years 1 month 6 days
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 133.3

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-6

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 321
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-Section 50
-Paragraph 4
-Publisher FASB
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