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Commitments And Contingencies (Narrative) (Details) (USD $) | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract] |  |
Proceeds from insurance | $ 28,226,000 | $ 0
Entergy Mississippi [Member] |  |
Commitments and Contingencies Disclosure [Abstract] |  |
Property insurance deductible | 20,000,000 |
Entergy Arkansas [Member] |  |
Commitments and Contingencies Disclosure [Abstract] |  |
Estimated cost to restore ANO to service | 95,000,000 |
Authorized deferred fuel balance retained related to ANO stator incident | 65,900,000 |
Course of construction sublimit | 50,000,000 |
Proceeds from insurance settlement, operating and investing activities | 33,000,000 |
Proceeds from insurance | 24,156,000 | 0
Minimum [Member] | Entergy Mississippi [Member] |  |
Commitments and Contingencies Disclosure [Abstract] |  |
Estimated cost to restore Baxter Wilson to service | 45,000,000 |
Maximum [Member] | Entergy Mississippi [Member] |  |
Commitments and Contingencies Disclosure [Abstract] |  |
Estimated cost to restore Baxter Wilson to service | $ 60,000,000 |

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- Definition Authorized Deferred Fuel Balance Retained Related To ANO Stator Incident + References No definition available. + Details
Name: | etr_AuthorizedDeferredFuelBalanceRetainedRelatedToANOStatorIncident
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Nuclear Electric Insurance Limited course of construction sublimit applicable to any loss associated with the lifting apparatus failure and stator drop at ANO. + References No definition available. + Details
Name: | etr_CourseOfConstructionSublimit
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Cost to assess the incident, remove debris, replace damaged property and equipment, and restore ANO to service. + References No definition available. + Details
Name: | etr_EstimatedCostToRestoreAnoToService
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Estimated cost to restore Baxter Wilson to service + References No definition available. + Details
Name: | etr_EstimatedCostToRestoreBaxterWilsonToService
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds From Insurance Settlement, Operating and Investing Activities + References No definition available. + Details
Name: | etr_ProceedsFromInsuranceSettlementOperatingandInvestingActivities
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Property Insurance Deductible + References No definition available. + Details
Name: | etr_PropertyInsuranceDeductible
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition The cash inflow from the amounts received by the insured under the terms of an insurance contract settlement. This element pertains only to insurance proceeds related to investments, for example fixed assets. It excludes insurance settlements classified as operating cash flows. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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