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Risk Management and Fair Values (Derivative Instruments Not Designated As Hedging Instruments On The Consolidated Statements Of Income) (Details) (Not Designated As Hedging Instrument [Member], USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Competitive Businesses Operating Revenues [Member] | Electricity Swaps And Options [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recognized in AOCI | $ 22 | $ 1 |
Amount of gain (loss) recorded in income | 21.0 | (1.0) |
Fuel, Fuel Related Expenses And Gas Purchased For Resale [Member] | Swap [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recognized in AOCI | 0 |  | 0
Amount of gain (loss) recorded in income | 17.0 | (20.0) |
Purchased Power Expense [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recognized in AOCI | 0 |  |
Amount of gain (loss) recorded in income | 46.0 |  |
Entergy Arkansas [Member] | Purchased Power Expense [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recorded in income | 5.1 |  |
Entergy Gulf States Louisiana [Member] | Fuel, Fuel Related Expenses And Gas Purchased For Resale [Member] | Natural Gas Swaps [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recorded in income | 6.8 | (6.2) |
Entergy Gulf States Louisiana [Member] | Purchased Power Expense [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recorded in income | 9.1 |  |
Entergy Louisiana [Member] | Fuel, Fuel Related Expenses And Gas Purchased For Resale [Member] | Natural Gas Swaps [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recorded in income | 8.0 | (8.3) |
Entergy Louisiana [Member] | Purchased Power Expense [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recorded in income | 8.0 |  |
Entergy Mississippi [Member] | Fuel, Fuel Related Expenses And Gas Purchased For Resale [Member] | Natural Gas Swaps [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recorded in income | 1.6 | (5.4) |
Entergy Mississippi [Member] | Purchased Power Expense [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recorded in income | 7.8 |  |
Entergy New Orleans [Member] | Fuel, Fuel Related Expenses And Gas Purchased For Resale [Member] | Natural Gas Swaps [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recorded in income | 0.7 |  |
Entergy New Orleans [Member] | Purchased Power Expense [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recorded in income | 2.9 |  |
Entergy Texas [Member] | Purchased Power Expense [Member] | Fixed Transmission Rights (FTRs) [Member] |  |  |
Effect of Derivative instruments not designated as hedging instruments on the consolidated statements of income |  |  |
Amount of gain (loss) recorded in income | $ 12.8 |  |

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- Definition Derivative instruments not designated as hedging instruments gain loss recognized in other comprehensive income effective portion, net. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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