Asset Retirement Obligations (Cumulative Decommissioning And Retirement Cost Liabilities And Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	$ 4,505.8	$ 4,271.5	$ 4,757.1
Asset Retirement Obligation, Accretion Expense	219.4	236.0
Asset Retirement Obligation, Liabilities Settled		(707.8)
Asset Retirement Obligation, Period Increase (Decrease)		13.3
Asset Retirement Obligation, Revision of Estimate	14.9	(0.5)
Entergy Arkansas [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	1,560.1	1,472.7	1,390.4
Asset Retirement Obligation, Accretion Expense	87.4	82.3
Asset Retirement Obligation, Liabilities Settled		0.0
Asset Retirement Obligation, Period Increase (Decrease)		0.0
Asset Retirement Obligation, Revision of Estimate	0.0	0.0
Entergy Louisiana [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	1,836.2	1,736.8	1,653.2
Asset Retirement Obligation, Accretion Expense	88.6	84.1
Asset Retirement Obligation, Liabilities Settled		0.0
Asset Retirement Obligation, Period Increase (Decrease)		3.3
Asset Retirement Obligation, Revision of Estimate	10.8	2.8
Entergy Mississippi [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	8.2	7.8	10.3
Asset Retirement Obligation, Accretion Expense	0.4	0.6
Asset Retirement Obligation, Liabilities Settled		0.0
Asset Retirement Obligation, Period Increase (Decrease)		3.1
Asset Retirement Obligation, Revision of Estimate	0.0	0.0
Entergy New Orleans [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	4.6	0.0	4.0
Asset Retirement Obligation, Accretion Expense	0.5	0.1
Asset Retirement Obligation, Liabilities Settled		0.0
Asset Retirement Obligation, Period Increase (Decrease)		4.1
Asset Retirement Obligation, Revision of Estimate	4.1	0.0
Entergy Texas [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	11.7	11.1	8.5
Asset Retirement Obligation, Accretion Expense	0.6	0.5
Asset Retirement Obligation, Liabilities Settled		0.0
Asset Retirement Obligation, Period Increase (Decrease)		0.0
Asset Retirement Obligation, Revision of Estimate	0.0	2.1
System Energy [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	1,084.2	1,042.5	1,007.6
Asset Retirement Obligation, Accretion Expense	41.7	40.2
Asset Retirement Obligation, Liabilities Settled		0.0
Asset Retirement Obligation, Period Increase (Decrease)		0.0
Asset Retirement Obligation, Revision of Estimate	$ 0.0	(5.4)
Other [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation		0.6	0.6
Asset Retirement Obligation, Accretion Expense		0.0
Asset Retirement Obligation, Liabilities Settled		0.0
Asset Retirement Obligation, Period Increase (Decrease)		0.0
Asset Retirement Obligation, Revision of Estimate		0.0
Big Rock Point [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation		0.0	42.0
Asset Retirement Obligation, Accretion Expense		2.0
Asset Retirement Obligation, Liabilities Settled		(42.8)
Asset Retirement Obligation, Period Increase (Decrease)		1.2
Asset Retirement Obligation, Revision of Estimate		0.0
Palisades [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation		0.0	$ 640.4
Asset Retirement Obligation, Accretion Expense		31.0
Asset Retirement Obligation, Liabilities Settled		(669.8)
Asset Retirement Obligation, Period Increase (Decrease)		1.6
Asset Retirement Obligation, Revision of Estimate		$ 0.0

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.

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

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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

+ References

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

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- Definition

Amount of increase (decrease) in asset retirement obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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 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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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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