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Risk Management and Fair Values (Reconciliation Of Changes In The Net Assets (Liabilities) For The Fair Value Of Derivatives Classified As Level 3 In The Fair Value Hierarchy) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Electricity Swaps And Options [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Realized Gain (Loss) Included In Earnings | $ 14.0 | $ 0.0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance at Beginning of Period | (65.0) | 5.0
Unrealized losses included in OCI | 91.0 | 50.0
Included as a regulatory liability/asset | 0.0 | 0.0
Settlements | 35.0 | (50.0)
Balance as of March 31, | 75.0 | 5.0
Fixed Transmission Rights (FTRs) [Member] |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Realized Gain (Loss) Included In Earnings | (1.0) | 0.0
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance at Beginning of Period | 21.0 | 21.0
Unrealized losses included in OCI | 0.0 | 0.0
Included as a regulatory liability/asset | 20.0 | 17.0
Settlements | (32.0) | (30.0)
Balance as of March 31, | 8.0 | 8.0
Fixed Transmission Rights (FTRs) [Member] | Entergy Arkansas [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance at Beginning of Period | 3.0 | 5.4
Included as a regulatory liability/asset | 6.8 |
Unrealized gains included as a regulatory liability/asset |  | 0.1
Settlements | (8.0) | (4.6)
Balance as of March 31, | 1.8 | 0.9
Fixed Transmission Rights (FTRs) [Member] | Entergy Louisiana [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance at Beginning of Period | 10.2 | 8.5
Included as a regulatory liability/asset | 10.8 |
Unrealized gains included as a regulatory liability/asset |  | 10.8
Settlements | (17.6) | (15.2)
Balance as of March 31, | 3.4 | 4.1
Fixed Transmission Rights (FTRs) [Member] | Entergy Mississippi [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance at Beginning of Period | 2.1 | 3.2
Included as a regulatory liability/asset | 6.6 |
Unrealized gains included as a regulatory liability/asset |  | 1.2
Settlements | (7.8) | (3.1)
Balance as of March 31, | 0.9 | 1.3
Fixed Transmission Rights (FTRs) [Member] | Entergy New Orleans [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance at Beginning of Period | 2.2 | 1.1
Included as a regulatory liability/asset | 1.8 |
Unrealized gains included as a regulatory liability/asset |  | 1.8
Settlements | (3.3) | (2.4)
Balance as of March 31, | 0.7 | 0.5
Fixed Transmission Rights (FTRs) [Member] | Entergy Texas [Member] |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Balance at Beginning of Period | 3.4 | 3.1
Included as a regulatory liability/asset | (5.5) |
Unrealized gains included as a regulatory liability/asset |  | 3.2
Settlements | 3.5 | (5.3)
Balance as of March 31, | $ 1.4 | $ 1.0

X
- Definition This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets and liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3). + References No definition available. + Details
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- Definition This element represents an asset and liabilities measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances. + References No definition available. + Details
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- Definition Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Unrealized Gains Loss Included As Regulatory Asset Liability + References No definition available. + Details
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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Realized Gain (Loss) Included In Earnings + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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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. + Details
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