Asset Retirement Obligations (Cumulative Decommissioning And Retirement Cost Liabilities And Expenses) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	$ 4,271.5	$ 4,757.1	$ 6,469.5
Accretion	236.0	317.9
Spending	(707.8)	(1,997.1)
Asset Retirement Obligation, Period Increase (Decrease)	13.3	33.2
Change in Cash Flow Estimate	(0.5)
Entergy Arkansas [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	1,472.7	1,390.4	1,314.2
Accretion	82.3	77.7
Spending	0.0	(1.5)
Asset Retirement Obligation, Period Increase (Decrease)	0.0	0.0
Change in Cash Flow Estimate	0.0
Entergy Louisiana [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	1,736.8	1,653.2	1,573.3
Accretion	84.1	79.9
Spending	0.0	0.0
Asset Retirement Obligation, Period Increase (Decrease)	3.3	0.0
Change in Cash Flow Estimate	2.8
Entergy Mississippi [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	7.8	10.3	9.8
Accretion	0.6	0.5
Spending	0.0	0.0
Asset Retirement Obligation, Period Increase (Decrease)	3.1	0.0
Change in Cash Flow Estimate	0.0
Entergy New Orleans [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	0.0	4.0	3.8
Accretion	0.1	0.2
Spending	0.0	0.0
Asset Retirement Obligation, Period Increase (Decrease)	4.1	0.0
Change in Cash Flow Estimate	0.0
Entergy Texas [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	11.1	8.5	8.1
Accretion	0.5	0.4
Spending	0.0	0.0
Asset Retirement Obligation, Period Increase (Decrease)	0.0	0.0
Change in Cash Flow Estimate	2.1
System Energy [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	1,042.5	1,007.6	968.9
Accretion	40.2	38.7
Spending	0.0	0.0
Asset Retirement Obligation, Period Increase (Decrease)	0.0	0.0
Change in Cash Flow Estimate	(5.4)
Entergy Wholesale Commodities [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	0.6	0.6	0.5
Accretion	0.0	0.1
Spending	0.0	0.0
Asset Retirement Obligation, Period Increase (Decrease)	0.0	0.0
Change in Cash Flow Estimate	0.0
Big Rock Point [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	0.0	42.0	41.1
Accretion	2.0	3.4
Spending	(42.8)	0.0
Asset Retirement Obligation, Period Increase (Decrease)	1.2	2.5
Change in Cash Flow Estimate	0.0
Indian Point 1 [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation		0.0	246.6
Accretion		8.8
Spending		(254.1)
Asset Retirement Obligation, Period Increase (Decrease)		1.3
Indian Point 2 [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation		0.0	839.8
Accretion		28.9
Spending		(843.6)
Asset Retirement Obligation, Period Increase (Decrease)		25.1
Indian Point 3 [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation		0.0	869.4
Accretion		29.1
Spending		(897.9)
Asset Retirement Obligation, Period Increase (Decrease)		0.6
Palisades [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation	0.0	640.4	$ 594.1
Accretion	31.0	50.1
Spending	(669.8)	0.0
Asset Retirement Obligation, Period Increase (Decrease)	1.6	$ 3.8
Change in Cash Flow 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.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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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

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- Definition

Amount of increase (decrease) in asset retirement obligations.

+ References

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 35
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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

+ References

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