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Risk Management and Fair Values (Fair Values Of Derivative Instruments) (Details) (USD $) In Millions, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Other Non-Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member] |  |  |  |
Liabilities: |  |  |  |
Derivative Liability, Fair Value, Gross Liability | $ 45 | [1] |  |
Derivative liability as hedging instrument offset | (7) | [2] |  |
Derivative Liability | 38.0 | [3],[4] |  |
Other Non-Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Liabilities: |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 2 | [1] |  |
Derivative liability as hedging instrument offset | 0 | [2] |  |
Derivative Liability | 2.0 | [3],[4] |  |
Other Deferred Debits And Other Assets [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 21.0 | [1] | 17.0 | [1]
Derivative asset as hedging instrument offset | (5) | [2] | (17) | [2]
Derivative Asset | 16 | [3],[4] | 0 | [3],[4]
Other Deferred Debits And Other Assets [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 2.0 | [1] |  |
Derivative asset as hedging instrument offset | 1 | [2] |  |
Derivative Asset | 3 | [3],[4] |  |
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 100.0 | [1] | 118.0 | [1]
Derivative asset as hedging instrument offset | (93) | [2] | (99) | [2]
Derivative Asset | 7 | [3],[4] | 19 | [3],[4]
Prepayments And Other [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 81.0 | [1] | 177.0 | [1]
Derivative asset as hedging instrument offset | (71) | [2] | (122) | [2]
Derivative Asset | 10 | [3],[4] | 55 | [3],[4]
Prepayments And Other [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 3.0 |  | 6.0 | [1]
Derivative asset as hedging instrument offset |  |  | 0 | [2]
Derivative Asset | 3 |  | 6 | [3],[4]
Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Utility and Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 163.0 |  | 36.0 | [1]
Derivative asset as hedging instrument offset | (19) |  | (2) | [2]
Derivative Asset | 144 |  | 34 | [3],[4]
Other Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member] |  |  |  |
Liabilities: |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 170 | [1] | 197 | [1]
Derivative liability as hedging instrument offset | (113) | [2] | (131) | [2]
Derivative Liability | 57.0 | [3],[4] | 66.0 | [3],[4]
Other Current Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Liabilities: |  |  |  |
Derivative Liability, Fair Value, Gross Liability | 75 | [1] | 201 | [1]
Derivative liability as hedging instrument offset | (48) | [2] | (89) | [2]
Derivative Liability | 27.0 | [3],[4] | 112.0 | [3],[4]
Other Noncurrent Liabilities [Member] | Electricity Swaps And Options [Member] | Entergy Wholesale Commodities [Member] | Designated As Hedging Instrument [Member] |  |  |  |
Liabilities: |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  | 46 | [1]
Derivative liability as hedging instrument offset |  |  | (17) | [2]
Derivative Liability |  |  | 29.0 | [3],[4]
Entergy Gulf States Louisiana [Member] | Gas Hedge Contracts [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 1.2 |  | 2.2 |
Entergy Gulf States Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 47.2 |  | 6.7 |
Entergy Louisiana [Member] | Gas Hedge Contracts [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 1.5 |  | 2.9 |
Entergy Louisiana [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 23.6 |  | 5.7 |
Entergy Mississippi [Member] | Prepayments And Other [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 0.6 |  | 0.7 |
Entergy Mississippi [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 12.7 |  | 1.0 |
Entergy New Orleans [Member] | Prepayments And Other [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset |  |  | 0.1 |
Entergy New Orleans [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 8.5 |  | 2.0 |
Entergy Arkansas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | 3.0 |  |  |
Entergy Texas [Member] | Prepayments And Other [Member] | Fixed Transmission Rights (FTRs) [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |
Assets: |  |  |  |
Derivative Asset, Fair Value, Gross Asset | $ 47.8 |  | $ 18.4 |
[1] | Represents the gross amounts of recognized assets/liabilities
[2] | Represents the netting of fair value balances with the same counterparty
[3] | Represents the net amounts of assets /liabilities presented on the Entergy Consolidated Balance Sheets
[4] | Excludes cash collateral in the amounts of $13 million posted as of June 30, 2014 and $47 million posted and $4 million held as of December 31, 2013

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226008-175313 + Details
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