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{us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis} : International [Member]
12/31/2010
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{us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis} : International [Member]
12/31/2009
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{etr_DefinedBenefitPlanAssetsTaxableStatusAxis} : Taxable [Member]
12/31/2010
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{etr_DefinedBenefitPlanAssetsTaxableStatusAxis} : Taxable [Member]
12/31/2009
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12/31/2010
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12/31/2009
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12/31/2010
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12/31/2009
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 -Number 132R
 -Paragraph 5
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{etr_DefinedBenefitPlanAssetsTaxableStatusAxis} : Non - Taxable [Member]
{us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis} : International [Member]
12/31/2010
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{etr_DefinedBenefitPlanAssetsTaxableStatusAxis} : Non - Taxable [Member]
{us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis} : International [Member]
12/31/2009
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 -Publisher FASB
 -Name Statement of Financial Accounting Standard (FAS)
 -Number 132R
 -Paragraph 5
 -Subparagraph d(1)

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