Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2015
Income Taxes	INCOME TAXES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) See “Income Tax Litigation,” “Income Tax Audits,” and “Other Tax Matters” in Note 3 to the financial statements in the Form 10-K for a discussion of income tax proceedings, income tax audits, and other income tax matters involving Entergy. Following are updates to that discussion. The IRS finalized in the first quarter 2015 tax and interest computations from the 2006-2007 audit that resulted in a reduction in Entergy's income tax expense of approximately $20 million, including decreases in income tax expense of approximately $4 million for Entergy Arkansas, $6 million for Entergy Louisiana, and $1 million for System Energy. See Note 3 to the financial statements in the Form 10-K for a discussion of the 2008-2009 IRS audit. In August 2015, Entergy and the IRS agreed on the treatment of the 2009 position regarding nuclear decommissioning liabilities from the 2008-2009 audit. The agreement provides that Entergy is entitled to deduct approximately $118 million of the $9.3 billion claimed in 2009. The agreement effectively settled all matters pertaining to the 2009 tax year and increased Entergy’s 2009 federal income tax liability by $2.4 million. The application of the adjustment and the agreed method of accounting for nuclear decommissioning for years subsequent to 2009 along with other increases and decreases in taxable income during the period reduces Entergy’s federal net operating loss from $12.3 billion as of December 31, 2014 to approximately $1.9 billion as of September 30, 2015. Such adjustments and activity also reduce state net operating losses. As discussed in Note 2 to the financial statements herein, in October 2015 two of Entergy’s Louisiana utilities, Entergy Gulf States Louisiana and Old Entergy Louisiana, combined their businesses into a legal entity to be known as Entergy Louisiana. The new Entergy Louisiana took a carryover tax basis in the assets received, and the tax consequences provided for an increase in tax basis as well. To the extent that this increase in tax basis will provide additional tax depreciation, in October 2015, Entergy recorded and Entergy Louisiana obtained a corresponding deferred tax asset of approximately $335 million. Consistent with the terms of an agreement with the LPSC, customers of Entergy Louisiana will realize customer credits associated with the business combination; accordingly, in October 2015, Entergy recorded a regulatory liability of $107 million ($66 million net-of-tax) which partially offsets the income effect of the aforementioned deferred tax asset.
Entergy Arkansas [Member]
Income Taxes	INCOME TAXES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) See “Income Tax Litigation,” “Income Tax Audits,” and “Other Tax Matters” in Note 3 to the financial statements in the Form 10-K for a discussion of income tax proceedings, income tax audits, and other income tax matters involving Entergy. Following are updates to that discussion. The IRS finalized in the first quarter 2015 tax and interest computations from the 2006-2007 audit that resulted in a reduction in Entergy's income tax expense of approximately $20 million, including decreases in income tax expense of approximately $4 million for Entergy Arkansas, $6 million for Entergy Louisiana, and $1 million for System Energy. See Note 3 to the financial statements in the Form 10-K for a discussion of the 2008-2009 IRS audit. In August 2015, Entergy and the IRS agreed on the treatment of the 2009 position regarding nuclear decommissioning liabilities from the 2008-2009 audit. The agreement provides that Entergy is entitled to deduct approximately $118 million of the $9.3 billion claimed in 2009. The agreement effectively settled all matters pertaining to the 2009 tax year and increased Entergy’s 2009 federal income tax liability by $2.4 million. The application of the adjustment and the agreed method of accounting for nuclear decommissioning for years subsequent to 2009 along with other increases and decreases in taxable income during the period reduces Entergy’s federal net operating loss from $12.3 billion as of December 31, 2014 to approximately $1.9 billion as of September 30, 2015. Such adjustments and activity also reduce state net operating losses. As discussed in Note 2 to the financial statements herein, in October 2015 two of Entergy’s Louisiana utilities, Entergy Gulf States Louisiana and Old Entergy Louisiana, combined their businesses into a legal entity to be known as Entergy Louisiana. The new Entergy Louisiana took a carryover tax basis in the assets received, and the tax consequences provided for an increase in tax basis as well. To the extent that this increase in tax basis will provide additional tax depreciation, in October 2015, Entergy recorded and Entergy Louisiana obtained a corresponding deferred tax asset of approximately $335 million. Consistent with the terms of an agreement with the LPSC, customers of Entergy Louisiana will realize customer credits associated with the business combination; accordingly, in October 2015, Entergy recorded a regulatory liability of $107 million ($66 million net-of-tax) which partially offsets the income effect of the aforementioned deferred tax asset.
Entergy Louisiana [Member]
Income Taxes	INCOME TAXES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) See “Income Tax Litigation,” “Income Tax Audits,” and “Other Tax Matters” in Note 3 to the financial statements in the Form 10-K for a discussion of income tax proceedings, income tax audits, and other income tax matters involving Entergy. Following are updates to that discussion. The IRS finalized in the first quarter 2015 tax and interest computations from the 2006-2007 audit that resulted in a reduction in Entergy's income tax expense of approximately $20 million, including decreases in income tax expense of approximately $4 million for Entergy Arkansas, $6 million for Entergy Louisiana, and $1 million for System Energy. See Note 3 to the financial statements in the Form 10-K for a discussion of the 2008-2009 IRS audit. In August 2015, Entergy and the IRS agreed on the treatment of the 2009 position regarding nuclear decommissioning liabilities from the 2008-2009 audit. The agreement provides that Entergy is entitled to deduct approximately $118 million of the $9.3 billion claimed in 2009. The agreement effectively settled all matters pertaining to the 2009 tax year and increased Entergy’s 2009 federal income tax liability by $2.4 million. The application of the adjustment and the agreed method of accounting for nuclear decommissioning for years subsequent to 2009 along with other increases and decreases in taxable income during the period reduces Entergy’s federal net operating loss from $12.3 billion as of December 31, 2014 to approximately $1.9 billion as of September 30, 2015. Such adjustments and activity also reduce state net operating losses. As discussed in Note 2 to the financial statements herein, in October 2015 two of Entergy’s Louisiana utilities, Entergy Gulf States Louisiana and Old Entergy Louisiana, combined their businesses into a legal entity to be known as Entergy Louisiana. The new Entergy Louisiana took a carryover tax basis in the assets received, and the tax consequences provided for an increase in tax basis as well. To the extent that this increase in tax basis will provide additional tax depreciation, in October 2015, Entergy recorded and Entergy Louisiana obtained a corresponding deferred tax asset of approximately $335 million. Consistent with the terms of an agreement with the LPSC, customers of Entergy Louisiana will realize customer credits associated with the business combination; accordingly, in October 2015, Entergy recorded a regulatory liability of $107 million ($66 million net-of-tax) which partially offsets the income effect of the aforementioned deferred tax asset.
Entergy Mississippi [Member]
Income Taxes	INCOME TAXES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) See “Income Tax Litigation,” “Income Tax Audits,” and “Other Tax Matters” in Note 3 to the financial statements in the Form 10-K for a discussion of income tax proceedings, income tax audits, and other income tax matters involving Entergy. Following are updates to that discussion. The IRS finalized in the first quarter 2015 tax and interest computations from the 2006-2007 audit that resulted in a reduction in Entergy's income tax expense of approximately $20 million, including decreases in income tax expense of approximately $4 million for Entergy Arkansas, $6 million for Entergy Louisiana, and $1 million for System Energy. See Note 3 to the financial statements in the Form 10-K for a discussion of the 2008-2009 IRS audit. In August 2015, Entergy and the IRS agreed on the treatment of the 2009 position regarding nuclear decommissioning liabilities from the 2008-2009 audit. The agreement provides that Entergy is entitled to deduct approximately $118 million of the $9.3 billion claimed in 2009. The agreement effectively settled all matters pertaining to the 2009 tax year and increased Entergy’s 2009 federal income tax liability by $2.4 million. The application of the adjustment and the agreed method of accounting for nuclear decommissioning for years subsequent to 2009 along with other increases and decreases in taxable income during the period reduces Entergy’s federal net operating loss from $12.3 billion as of December 31, 2014 to approximately $1.9 billion as of September 30, 2015. Such adjustments and activity also reduce state net operating losses. As discussed in Note 2 to the financial statements herein, in October 2015 two of Entergy’s Louisiana utilities, Entergy Gulf States Louisiana and Old Entergy Louisiana, combined their businesses into a legal entity to be known as Entergy Louisiana. The new Entergy Louisiana took a carryover tax basis in the assets received, and the tax consequences provided for an increase in tax basis as well. To the extent that this increase in tax basis will provide additional tax depreciation, in October 2015, Entergy recorded and Entergy Louisiana obtained a corresponding deferred tax asset of approximately $335 million. Consistent with the terms of an agreement with the LPSC, customers of Entergy Louisiana will realize customer credits associated with the business combination; accordingly, in October 2015, Entergy recorded a regulatory liability of $107 million ($66 million net-of-tax) which partially offsets the income effect of the aforementioned deferred tax asset.
Entergy New Orleans [Member]
Income Taxes	INCOME TAXES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) See “Income Tax Litigation,” “Income Tax Audits,” and “Other Tax Matters” in Note 3 to the financial statements in the Form 10-K for a discussion of income tax proceedings, income tax audits, and other income tax matters involving Entergy. Following are updates to that discussion. The IRS finalized in the first quarter 2015 tax and interest computations from the 2006-2007 audit that resulted in a reduction in Entergy's income tax expense of approximately $20 million, including decreases in income tax expense of approximately $4 million for Entergy Arkansas, $6 million for Entergy Louisiana, and $1 million for System Energy. See Note 3 to the financial statements in the Form 10-K for a discussion of the 2008-2009 IRS audit. In August 2015, Entergy and the IRS agreed on the treatment of the 2009 position regarding nuclear decommissioning liabilities from the 2008-2009 audit. The agreement provides that Entergy is entitled to deduct approximately $118 million of the $9.3 billion claimed in 2009. The agreement effectively settled all matters pertaining to the 2009 tax year and increased Entergy’s 2009 federal income tax liability by $2.4 million. The application of the adjustment and the agreed method of accounting for nuclear decommissioning for years subsequent to 2009 along with other increases and decreases in taxable income during the period reduces Entergy’s federal net operating loss from $12.3 billion as of December 31, 2014 to approximately $1.9 billion as of September 30, 2015. Such adjustments and activity also reduce state net operating losses. As discussed in Note 2 to the financial statements herein, in October 2015 two of Entergy’s Louisiana utilities, Entergy Gulf States Louisiana and Old Entergy Louisiana, combined their businesses into a legal entity to be known as Entergy Louisiana. The new Entergy Louisiana took a carryover tax basis in the assets received, and the tax consequences provided for an increase in tax basis as well. To the extent that this increase in tax basis will provide additional tax depreciation, in October 2015, Entergy recorded and Entergy Louisiana obtained a corresponding deferred tax asset of approximately $335 million. Consistent with the terms of an agreement with the LPSC, customers of Entergy Louisiana will realize customer credits associated with the business combination; accordingly, in October 2015, Entergy recorded a regulatory liability of $107 million ($66 million net-of-tax) which partially offsets the income effect of the aforementioned deferred tax asset.
Entergy Texas [Member]
Income Taxes	INCOME TAXES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) See “Income Tax Litigation,” “Income Tax Audits,” and “Other Tax Matters” in Note 3 to the financial statements in the Form 10-K for a discussion of income tax proceedings, income tax audits, and other income tax matters involving Entergy. Following are updates to that discussion. The IRS finalized in the first quarter 2015 tax and interest computations from the 2006-2007 audit that resulted in a reduction in Entergy's income tax expense of approximately $20 million, including decreases in income tax expense of approximately $4 million for Entergy Arkansas, $6 million for Entergy Louisiana, and $1 million for System Energy. See Note 3 to the financial statements in the Form 10-K for a discussion of the 2008-2009 IRS audit. In August 2015, Entergy and the IRS agreed on the treatment of the 2009 position regarding nuclear decommissioning liabilities from the 2008-2009 audit. The agreement provides that Entergy is entitled to deduct approximately $118 million of the $9.3 billion claimed in 2009. The agreement effectively settled all matters pertaining to the 2009 tax year and increased Entergy’s 2009 federal income tax liability by $2.4 million. The application of the adjustment and the agreed method of accounting for nuclear decommissioning for years subsequent to 2009 along with other increases and decreases in taxable income during the period reduces Entergy’s federal net operating loss from $12.3 billion as of December 31, 2014 to approximately $1.9 billion as of September 30, 2015. Such adjustments and activity also reduce state net operating losses. As discussed in Note 2 to the financial statements herein, in October 2015 two of Entergy’s Louisiana utilities, Entergy Gulf States Louisiana and Old Entergy Louisiana, combined their businesses into a legal entity to be known as Entergy Louisiana. The new Entergy Louisiana took a carryover tax basis in the assets received, and the tax consequences provided for an increase in tax basis as well. To the extent that this increase in tax basis will provide additional tax depreciation, in October 2015, Entergy recorded and Entergy Louisiana obtained a corresponding deferred tax asset of approximately $335 million. Consistent with the terms of an agreement with the LPSC, customers of Entergy Louisiana will realize customer credits associated with the business combination; accordingly, in October 2015, Entergy recorded a regulatory liability of $107 million ($66 million net-of-tax) which partially offsets the income effect of the aforementioned deferred tax asset.
System Energy [Member]
Income Taxes	INCOME TAXES (Entergy Corporation, Entergy Arkansas, Entergy Louisiana, Entergy Mississippi, Entergy New Orleans, Entergy Texas, and System Energy) See “Income Tax Litigation,” “Income Tax Audits,” and “Other Tax Matters” in Note 3 to the financial statements in the Form 10-K for a discussion of income tax proceedings, income tax audits, and other income tax matters involving Entergy. Following are updates to that discussion. The IRS finalized in the first quarter 2015 tax and interest computations from the 2006-2007 audit that resulted in a reduction in Entergy's income tax expense of approximately $20 million, including decreases in income tax expense of approximately $4 million for Entergy Arkansas, $6 million for Entergy Louisiana, and $1 million for System Energy. See Note 3 to the financial statements in the Form 10-K for a discussion of the 2008-2009 IRS audit. In August 2015, Entergy and the IRS agreed on the treatment of the 2009 position regarding nuclear decommissioning liabilities from the 2008-2009 audit. The agreement provides that Entergy is entitled to deduct approximately $118 million of the $9.3 billion claimed in 2009. The agreement effectively settled all matters pertaining to the 2009 tax year and increased Entergy’s 2009 federal income tax liability by $2.4 million. The application of the adjustment and the agreed method of accounting for nuclear decommissioning for years subsequent to 2009 along with other increases and decreases in taxable income during the period reduces Entergy’s federal net operating loss from $12.3 billion as of December 31, 2014 to approximately $1.9 billion as of September 30, 2015. Such adjustments and activity also reduce state net operating losses. As discussed in Note 2 to the financial statements herein, in October 2015 two of Entergy’s Louisiana utilities, Entergy Gulf States Louisiana and Old Entergy Louisiana, combined their businesses into a legal entity to be known as Entergy Louisiana. The new Entergy Louisiana took a carryover tax basis in the assets received, and the tax consequences provided for an increase in tax basis as well. To the extent that this increase in tax basis will provide additional tax depreciation, in October 2015, Entergy recorded and Entergy Louisiana obtained a corresponding deferred tax asset of approximately $335 million. Consistent with the terms of an agreement with the LPSC, customers of Entergy Louisiana will realize customer credits associated with the business combination; accordingly, in October 2015, Entergy recorded a regulatory liability of $107 million ($66 million net-of-tax) which partially offsets the income effect of the aforementioned deferred tax asset.