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Risk Management and Fair Values (Narrative) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) MMBTU MWh counterparty | Mar. 31, 2015 USD ($) | Dec. 31, 2015 USD ($) counterparty
Risk Management and Fair Values [Abstract] |  |  |
Letters of Credit Outstanding, Amount | $ 0.4 |  |
Cash collateral posted |  |  | $ 9.0
Derivative, Collateral, Obligation to Return Cash | 66.0 |  | $ 68.0
Cash flow hedges relating to power sales as part of net unrealized gains | 152.0 |  |
Reclassified from accumulated other comprehensive income (OCI) to operating revenues | $ 134.0 |  |
Number of Derivative Contract Counterparties in a Liability Position | counterparty | 0 |  | 2
Maturity of cash flow hedges, Tax | $ 54.0 | $ 5.0 |
Maximum length of time over which Company is currently hedging the variability in future cash flows for forecasted power transactions, years | 2 years |  |
Planned generation sold forward from non utility nuclear power plants for the remainder of the period | 88.00% |  |
Planned Generation Sold Forward under financial derivatives | 60.00% |  |
Total planned generation for remainder of the period | MWh | 25,000,000 |  |
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU | 57,500,000 |  |
Total volume of fixed transmission rights outstanding | MWh | 18,305,000 |  |
Change in cash flow hedges due to ineffectiveness | $ (1.0) | (1.0) |
Dollar amount of hedge contract in a liability position |  |  | $ 2.0
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset and Liability Unrealized Gains (Loss) Included in Earnings | $ 6.0 | $ (87.0) |
Entergy Arkansas [Member] |  |  |
Risk Management and Fair Values [Abstract] |  |  |
Total volume of fixed transmission rights outstanding | MWh | 3,894,000 |  |
Entergy Louisiana [Member] |  |  |
Risk Management and Fair Values [Abstract] |  |  |
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU | 46,330,000 |  |
Total volume of fixed transmission rights outstanding | MWh | 8,385,000 |  |
Entergy Mississippi [Member] |  |  |
Risk Management and Fair Values [Abstract] |  |  |
Letters of Credit Outstanding, Amount | $ 0.4 |  |
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU | 11,170,000 |  |
Total volume of fixed transmission rights outstanding | MWh | 2,436,000 |  |
Entergy New Orleans [Member] |  |  |
Risk Management and Fair Values [Abstract] |  |  |
Total volume of fixed transmission rights outstanding | MWh | 1,398,000 |  |
Entergy Texas [Member] |  |  |
Risk Management and Fair Values [Abstract] |  |  |
Total volume of fixed transmission rights outstanding | MWh | 2,086,000 |  |

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