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[Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldietr_EntergyArkansasMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$7falsefalseUSDtruefalse{dei_LegalEntityAxis} : Entergy Gulf States Louisiana [Member] 1/1/2011 - 3/31/2011 USD ($) $ThreeMonthsEnded_31Mar2011_Entergy_Gulf_States_Louisiana_Memberhttp://www.sec.gov/CIK0000065984duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseEntergy Gulf States Louisiana [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldietr_EntergyGulfStatesLouisianaMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$8falsefalseUSDtruefalse{dei_LegalEntityAxis} : Entergy Louisiana [Member] 1/1/2011 - 3/31/2011 USD ($) $ThreeMonthsEnded_31Mar2011_Entergy_Louisiana_Memberhttp://www.sec.gov/CIK0000065984duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseEntergy Louisiana 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[Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldietr_EntergyNewOrleansMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$11falsefalseUSDtruefalse{dei_LegalEntityAxis} : Entergy Texas [Member] 1/1/2011 - 3/31/2011 USD ($) $ThreeMonthsEnded_31Mar2011_Entergy_Texas_Memberhttp://www.sec.gov/CIK0000065984duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseEntergy Texas [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldietr_EntergyTexasMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$12falsefalseUSDtruefalse{dei_LegalEntityAxis} : System Energy [Member] 3/31/2011 USD ($) $BalanceAsOf_31Mar2011_System_Energy_Memberhttp://www.sec.gov/CIK0000065984instant2011-03-31T00:00:000001-01-01T00:00:00falsefalseSystem Energy 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borrowings.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5truefalsefalse250000000250000falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7truefalsefalse200000000200000falsefalsefalsetruefalse8truefalsefalse250000000250000falsefalsefalsetruefalse9truefalsefalse175000000175000falsefalsefalsetruefalse10truefalsefalse100000000100000falsefalsefalsetruefalse11truefalsefalse200000000200000falsefalsefalsetruefalse12truefalsefalse200000000200000falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryAuthorized short-term borrowings.No authoritative reference available.falsefalseAuthorized14false0us-gaap_ShortTermBorrowingsus-gaaptruecreditinstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5truefalsefalse00falsetruefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7truefalsefalse00falsetruefalsetruefalse8truefalsefalse00falsetruefalsetruefalse9truefalsefalse126000000126000falsetruefalsetruefalse10truefalsefalse00falsetruefalsetruefalse11truefalsefalse60000006000falsetruefalsetruefalse12truefalsefalse00falsetruefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 falsefalseBorrowings1Borrowings under the Entergy Mississippi credit facilities may be secured by a security interest in its accounts receivable. Entergy Mississippi is required to maintain a consolidated debt ratio of 65% or less of its total capitalization. Prior to expiration on May 31, 2011, Entergy Mississippi expects to renew all of its credit facilities. 2In April 2011, Entergy Arkansas renewed its credit facility through April 2012 in the amount of $XX million. The credit facility requires Entergy Arkansas to maintain a debt ratio of 65% or less of its total capitalization.Borrowings under the Entergy Arkansas credit facility may be secured by a security interest in its accounts receivable.3The credit facility allows Entergy Gulf States Louisiana to issue letters of credit against the borrowing capacity of the facility. As of March 31, 2011, no letters of credit were outstanding. The credit facility requires Entergy Gulf States Louisiana to maintain a consolidated debt ratio of 65% or less of its total capitalization. Pursuant to the terms of the credit agreement, the amount of debt assumed by Entergy Texas ($0 as of December 31, 2010 and $168 million as of December 31, 2009) is excluded from debt and capitalization in calculating the debt ratio.4The credit facility allows Entergy Louisiana to issue letters of credit against the borrowing capacity of the facility. As of March 31, 2011, no letters of credit were outstanding. The credit facility requires Entergy Louisiana to maintain a consolidated debt ratio of 65% or less of its total capitalization.5The credit facility allows Entergy Texas to issue letters of credit against the borrowing capacity of the facility. As of March 31, 2011, no letters of credit were outstanding. The credit facility requires Entergy Texas to maintain a consolidated debt ratio of 65% or less of its total capitalization. Pursuant to the terms of the credit agreement securitization bonds are excluded from debt and capitalization in calculating the debt ratio.6The interest rate is the rate as of March 31, 2011 applied or that would be applied to the outstanding borrowings under the facility.1213Revolving Credit Facilities, Lines of Credit and Short-Term Borrowings and Long-Term Debt (Details) (USD $)ThousandsUnKnownUnKnownUnKnowntruetrue