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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, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Balance as of January 1, | $ (98.0) | $ 178.0 | $ 178.0
Realized losses included in earnings | (31) |  | (14)
Unrealized gains included in earnings | 53 |  | 5
Unrealized losses included in OCI | (222) | (119) |
Unrealized gains included as a regulatory asset/liability | 37 | 0 |
Purchases | 5 | 0 |
Settlements | 195.0 | 2.0 |
Balance as of March 31, | (61.0) | 52.0 | (98.0)
Entergy Arkansas [Member] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Balance as of January 1, |  | 0 | 0
Unrealized gains included as a regulatory liability/asset |  |  | 7.8
Settlements |  |  | 5.1
Balance as of March 31, |  |  | 2.7
Entergy Gulf States [Member] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Balance as of January 1, |  | 6.7 | 6.7
Unrealized gains included as a regulatory liability/asset |  |  | 7.7
Settlements |  |  | 9.0
Balance as of March 31, |  |  | 5.4
Entergy Louisiana [Member] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Balance as of January 1, |  | 5.7 | 5.7
Unrealized gains included as a regulatory liability/asset |  |  | 5.3
Settlements |  |  | 8.0
Balance as of March 31, |  |  | 3.0
Entergy Mississippi [Member] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Balance as of January 1, |  | 1.0 | 1.0
Unrealized gains included as a regulatory liability/asset |  |  | 11.6
Settlements |  |  | 7.8
Balance as of March 31, |  |  | 4.8
Entergy New Orleans [Member] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Balance as of January 1, |  | 2.0 | 2.0
Unrealized gains included as a regulatory liability/asset |  |  | 2.0
Settlements |  |  | 3.0
Balance as of March 31, |  |  | 1.0
Entergy Texas [Member] |  |  |
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |  |
Balance as of January 1, |  | 18.4 | 18.4
Unrealized gains included as a regulatory liability/asset |  |  | 1.8
Settlements |  |  | 12.8
Balance as of March 31, |  |  | $ 7.4

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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Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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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Namespace Prefix: | etr_
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Balance Type: | debit
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- Definition Fair Value Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Purchases + 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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Data Type: | xbrli:monetaryItemType
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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 Unrealized Gains (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=25499696&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=25499696&loc=d3e19207-110258 + Details
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