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Revenue (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Allowance for Credit Loss, Receivable, Other, Current	$ 32.3	$ 17.9	$ 25.9	$ 30.9
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	58.7	32.0	38.7
Accounts Receivable, Allowance for Credit Loss, Writeoff	(78.1)	(71.2)	(83.1)
Accounts Receivable, Allowance for Credit Loss, Recovery	33.8	31.2	39.4
Entergy Arkansas [Member]
Allowance for Credit Loss, Receivable, Other, Current	7.3	4.7	7.2	6.5
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	13.1	7.0	9.4
Accounts Receivable, Allowance for Credit Loss, Writeoff	(18.9)	(17.5)	(20.6)
Accounts Receivable, Allowance for Credit Loss, Recovery	8.4	8.0	11.9
Entergy Louisiana [Member]
Allowance for Credit Loss, Receivable, Other, Current	9.1	3.0	6.1	7.6
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	19.6	10.0	13.9
Accounts Receivable, Allowance for Credit Loss, Writeoff	(23.6)	(23.3)	(31.3)
Accounts Receivable, Allowance for Credit Loss, Recovery	10.1	10.2	15.9
Entergy New Orleans [Member]
Allowance for Credit Loss, Receivable, Other, Current	3.8	6.7	7.8	11.9
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	3.5	4.6	3.4
Accounts Receivable, Allowance for Credit Loss, Writeoff	(9.5)	(10.4)	(10.7)
Accounts Receivable, Allowance for Credit Loss, Recovery	3.1	4.7	3.2
Entergy Mississippi [Member]
Allowance for Credit Loss, Receivable, Other, Current	3.5	2.2	3.3	2.5
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	8.5	4.8	7.3
Accounts Receivable, Allowance for Credit Loss, Writeoff	(16.6)	(11.5)	(10.4)
Accounts Receivable, Allowance for Credit Loss, Recovery	9.4	5.6	3.9
Entergy Texas [Member]
Allowance for Credit Loss, Receivable, Other, Current	8.6	1.3	1.5	$ 2.4
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	14.0	5.6	4.7
Accounts Receivable, Allowance for Credit Loss, Writeoff	(9.5)	(8.5)	(10.1)
Accounts Receivable, Allowance for Credit Loss, Recovery	$ 2.8	$ 2.7	$ 4.5

X

- Definition

Amount of increase (decrease) in allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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X

- Definition

Amount of increase in allowance for credit loss on accounts receivable, from recovery.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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X

- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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X

- Definition

Amount of allowance for credit loss on receivable, classified as other and current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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