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Asset Retirement Obligations (Schedule of Change in Asset Retirement Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation	$ 4,947.5	$ 4,713.4	$ 4,505.8
Asset Retirement Obligation, Liabilities Incurred		41.1
Asset Retirement Obligation, Accretion Expense	243.1	233.8
Asset Retirement Obligation, Revision of Estimate	(9.0)	(67.3)
Entergy Arkansas [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation	1,791.4	1,691.6	1,560.1
Asset Retirement Obligation, Liabilities Incurred		17.7
Asset Retirement Obligation, Accretion Expense	100.7	93.6
Asset Retirement Obligation, Revision of Estimate	(0.9)	20.2
Entergy Louisiana [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation	1,932.4	1,842.9	1,836.2
Asset Retirement Obligation, Liabilities Incurred		19.4
Asset Retirement Obligation, Accretion Expense	94.1	94.4
Asset Retirement Obligation, Revision of Estimate	(4.6)	(107.1)
Entergy Mississippi [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation	26.5	25.1	8.2
Asset Retirement Obligation, Liabilities Incurred		4.0
Asset Retirement Obligation, Accretion Expense	1.4	1.1
Asset Retirement Obligation, Revision of Estimate	0.0	11.8
Entergy New Orleans [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation	5.2	4.9	4.6
Asset Retirement Obligation, Liabilities Incurred		0.0
Asset Retirement Obligation, Accretion Expense	0.3	0.3
Asset Retirement Obligation, Revision of Estimate	0.0	0.0
Entergy Texas [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation	15.1	17.7	11.7
Asset Retirement Obligation, Liabilities Incurred		0.0
Asset Retirement Obligation, Accretion Expense	0.8	0.8
Asset Retirement Obligation, Revision of Estimate	(3.4)	5.2
System Energy [Member]
Asset Retirement Obligations [Line Items]
Asset Retirement Obligation	1,173.0	1,127.7	$ 1,084.2
Asset Retirement Obligation, Liabilities Incurred		0.0
Asset Retirement Obligation, Accretion Expense	45.3	43.5
Asset Retirement Obligation, Revision of Estimate	$ 0.0	$ 0.0

X

- Definition

Asset Retirement Obligations [Line Items]

+ References

No definition available.

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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481999/410-20-25-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481879/410-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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Amount of asset retirement obligations incurred during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 410
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481850/410-20-50-1

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