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Retirement And Other Postretirement Benefits (Expected Employer Contributions) (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jun. 30, 2014
Change in Plan Assets |
Expected current year pension contributions | $ 400,000
Pension contributions made through Year To Date | 138,100
Entergy Arkansas [Member] |
Change in Plan Assets |
Expected current year pension contributions | 93,999
Pension contributions made through Year To Date | 32,746
Remaining estimated pension contributions to be made in current year | 61,253
Entergy Gulf States Louisiana [Member] |
Change in Plan Assets |
Expected current year pension contributions | 31,119
Pension contributions made through Year To Date | 10,377
Remaining estimated pension contributions to be made in current year | 20,742
Entergy Louisiana [Member] |
Change in Plan Assets |
Expected current year pension contributions | 53,047
Pension contributions made through Year To Date | 18,882
Remaining estimated pension contributions to be made in current year | 34,165
Entergy Mississippi [Member] |
Change in Plan Assets |
Expected current year pension contributions | 21,540
Pension contributions made through Year To Date | 7,504
Remaining estimated pension contributions to be made in current year | 14,036
Entergy New Orleans [Member] |
Change in Plan Assets |
Expected current year pension contributions | 10,495
Pension contributions made through Year To Date | 3,641
Remaining estimated pension contributions to be made in current year | 6,854
Entergy Texas [Member] |
Change in Plan Assets |
Expected current year pension contributions | 18,302
Pension contributions made through Year To Date | 5,889
Remaining estimated pension contributions to be made in current year | 12,413
System Energy [Member] |
Change in Plan Assets |
Expected current year pension contributions | 21,388
Pension contributions made through Year To Date | 7,300
Remaining estimated pension contributions to be made in current year | $ 14,088

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- Definition The remaining contributions to be made in current fiscal year. + References No definition available. + Details
Name: | etr_DefinedBenefitPlanRemainingContributionsToBeMadeInCurrentFiscalYear
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan in the current remaining fiscal period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration