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Risk Management and Fair Values (Fair Values Of Derivative Instruments) (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Assets: |  |  |  |  |
Derivative asset as hedging instrument offset |  | $ (66.0) |  | $ (68.0) |
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 | [1] | 1.0 |  | 2.0 |
Derivative liability as hedging instrument offset | [2] | (1.0) |  | (2.0) |
Derivative Liability | [3],[4] | 0.0 |  | 0.0 |
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 | [1] | 20.0 |  | 17.0 |
Derivative asset as hedging instrument offset | [2] | (1.0) |  | (2.0) |
Derivative Asset | [3],[4] | 19.0 |  | 15.0 |
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 | [1] | 120.0 |  | 173.0 |
Derivative asset as hedging instrument offset | [2] | (26.0) |  | (34.0) |
Derivative Asset | [3],[4] | 94.0 |  | 139.0 |
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 | [1] | 94.0 |  | 54.0 |
Derivative asset as hedging instrument offset | [2] | (24.0) |  | (13.0) |
Derivative Asset | [3],[4] | 70.0 |  | 41.0 |
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 | [1] | 9.0 |  | 24.0 |
Derivative asset as hedging instrument offset | [2] |  |  | (1.0) |
Derivative Asset | [3],[4] | 9.0 |  | 23.0 |
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 | [1] | 1.0 |  | 14.0 |
Derivative liability as hedging instrument offset | [2] | (1.0) |  | (14.0) |
Derivative Liability | [3],[4] | 0.0 |  | 0.0 |
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 | [1] | 49.0 |  | 38.0 |
Derivative liability as hedging instrument offset | [2] | (49.0) |  | (32.0) |
Derivative Liability | [3],[4] | 0.0 |  | 6.0 |
Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Utility [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability | [1] | 9.0 |  | 9.0 |
Derivative liability as hedging instrument offset |  | 0.0 | [1] | 0.0 | [2]
Derivative Liability | [3],[4] | 9.0 |  | 9.0 |
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 |  | 3.3 |  | 8.5 |
Entergy Louisiana [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 7.6 |  | 7.0 |
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 |  | 0.9 |  | 2.4 |
Entergy Mississippi [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  | 1.8 |  | 1.3 |
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 |  | 0.6 |  | 1.5 |
Entergy New Orleans [Member] | Other Current Liabilities [Member] | Natural Gas Swaps [Member] | Not Designated As Hedging Instrument [Member] |  |  |  |  |
Liabilities: |  |  |  |  |
Derivative Liability, Fair Value, Gross Liability |  |  |  | 0.5 |
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 |  | 3.7 |  | 7.9 |
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 |  | $ 0.9 |  | $ 2.2 |
[1] | Represents the gross amounts of recognized assets/liabilities
[2] | Represents the netting of fair value balances with the same counterparty
[3] | Excludes cash collateral in the amount of $9 million posted and $68 million held as of December 31, 2015. There was no cash collateral required to be posted as of March 31, 2016. Also excludes letters of credit in the amount of $0.4 million posted and $66 million held as of March 31, 2016.
[4] | Represents the net amounts of assets /liabilities presented on the Entergy Consolidated Balance Sheets

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