Asset Retirement Obligations (Fair Values Of Decommissioning Trust Funds And Related Asset Retirement Obligation Regulatory Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
ANO 1 and ANO 2 [Member]
Asset Retirement Obligations [Line Items]
Decommissioning Trust Fair Values	$ 912.0	$ 944.9
Regulatory Assets	375.9	337.9
River Bend [Member]
Asset Retirement Obligations [Line Items]
Decommissioning Trust Fair Values	803.4	818.2
Regulatory Liabilities	27.4	30.6
Waterford 3 [Member]
Asset Retirement Obligations [Line Items]
Decommissioning Trust Fair Values	481.6	493.9
Regulatory Assets	204.9	188.9
Grand Gulf [Member]
Asset Retirement Obligations [Line Items]
Decommissioning Trust Fair Values	869.5	905.7
Regulatory Assets	186.9	169.1
Entergy Wholesale Commodities [Member]
Asset Retirement Obligations [Line Items]
Decommissioning Trust Fair Values	3,853.7	4,049.3
Regulatory Assets	$ 0.0	$ 0.0

Asset Retirement Obligations [Line Items]

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- Definition

The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ 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 (b)
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382

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- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 980
-SubTopic 405
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6500807&loc=d3e48068-110394

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