XML 100 R57.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Risk Management and Fair Values (Narrative) (Details) $ in Thousands, TWh in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 USD ($) MMBTU GWh counterparty | Mar. 31, 2017 USD ($) | Dec. 31, 2018 TWh | Dec. 31, 2017 USD ($) counterparty
Risk Management and Fair Values [Abstract] |  |  |  |
Letters of Credit Outstanding, Amount | $ 69,000 |  |  | $ 34,000
Cash collateral posted | 1,000 |  |  | 1,000
Derivative, Collateral, Obligation to Return Cash | 6,000 |  |  | 4,000
Cash flow hedges relating to power sales as part of net unrealized gains | 65,000 |  |  |
Reclassified from accumulated other comprehensive income (OCI) to operating revenues | 41,000 |  |  |
Maturity of cash flow hedges, Tax | $ (6,000) | $ 18,000 |  |
Maximum length of time over which Company is currently hedging the variability in future cash flows for forecasted power transactions, years | 3 years |  |  |
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU | 63,890,000 |  |  |
Total volume of fixed transmission rights outstanding | GWh | 18,490 |  |  |
Change in cash flow hedges due to ineffectiveness | $ 13,300 | (1,000) |  |
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset and Liability Unrealized Gains (Loss) Included in Earnings | 200 | 400 |  |
Entergy Arkansas [Member] |  |  |  |
Risk Management and Fair Values [Abstract] |  |  |  |
Letters of Credit Outstanding, Amount | $ 200 |  |  | 200
Total volume of fixed transmission rights outstanding | GWh | 4,153 |  |  |
Entergy Louisiana [Member] |  |  |  |
Risk Management and Fair Values [Abstract] |  |  |  |
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU | 53,730,000 |  |  |
Total volume of fixed transmission rights outstanding | GWh | 8,162 |  |  |
Entergy Mississippi [Member] |  |  |  |
Risk Management and Fair Values [Abstract] |  |  |  |
Letters of Credit Outstanding, Amount | $ 100 |  |  | 100
Total volume of natural gas swaps outstanding (MMBtu) | MMBTU | 10,160,000 |  |  |
Total volume of fixed transmission rights outstanding | GWh | 2,562 |  |  |
Entergy New Orleans [Member] |  |  |  |
Risk Management and Fair Values [Abstract] |  |  |  |
Total volume of fixed transmission rights outstanding | GWh | 943 |  |  |
Entergy Texas [Member] |  |  |  |
Risk Management and Fair Values [Abstract] |  |  |  |
Letters of Credit Outstanding, Amount | $ 200 |  |  | 50
Total volume of fixed transmission rights outstanding | GWh | 2,541 |  |  |
Electricity Swaps And Options [Member] |  |  |  |
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Realized Gain (Loss) Included In Earnings | $ 14,000 | 0 |  |
Fixed Transmission Rights (FTRs) [Member] |  |  |  |
Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Realized Gain (Loss) Included In Earnings | (1,000) | $ 0 |  |
Entergy Wholesale Commodities [Member] |  |  |  |
Risk Management and Fair Values [Abstract] |  |  |  |
Letters of Credit Outstanding, Amount |  |  |  | 34,000
Cash collateral posted | 500 |  |  | 1,000
Derivative, Collateral, Obligation to Return Cash | 6,000 |  |  | $ 4,000
Letters of Credit Held | $ 69,000 |  |  |
Number of Derivative Contract Counterparties in a Liability Position | counterparty | 1 |  |  | 8
Dollar amount of hedge contract in a liability position | $ 300 |  |  | $ 65,000
Subsequent Event [Member] |  |  |  |
Risk Management and Fair Values [Abstract] |  |  |  |
Planned generation sold forward from non utility nuclear power plants for the remainder of the period |  |  | 98.00% |
Planned Generation From Non Nuclear Power Plants Sold Forward Under Financial Hedges |  |  | 79.00% |
Total planned generation for remainder of the period | TWh |  |  | 20.7 |

X
- Definition Derivative Instruments Gain Loss Reclassified From Accumulated OCI Into Income Effective Portion, Tax. + References No definition available. + Details
Name: | etr_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionTax
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Realized Gain (Loss) Included In Earnings + References No definition available. + Details
Name: | etr_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetandLiabilityRealizedGainLossIncludedInEarnings
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair Value Measurement with Unobservable Inputs Reconciliation Recurring Basis Asset and Liability Unrealized Gains (Loss) Included in Earnings + References No definition available. + Details
Name: | etr_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetandLiabilityUnrealizedGainsLossIncludedinEarnings
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Dollar amount of hedge contract in a liability position. + References No definition available. + Details
Name: | etr_HedgeContractsInLiabilityPosition
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Letters of credit posted to Entergy by its counterparties + References No definition available. + Details
Name: | etr_LettersofCreditHeld
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum length of time over which Company is currently hedging the variability in future cash flows with derivatives for forecasted power transactions. + References No definition available. + Details
Name: | etr_MaximumlengthoftimeoverwhichCompanyiscurrentlyhedgingthevariabilityinfuturecashflowsforforecastedpowertransactions
Namespace Prefix: | etr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Derivative Contract Counterparties in a Liability Position + References No definition available. + Details
Name: | etr_NumberofDerivativeContractCounterpartiesinaLiabilityPosition
Namespace Prefix: | etr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Planned generation from non nuclear power plants sold forward under financial hedges for remainder of the period + References No definition available. + Details
Name: | etr_PlannedGenerationFromNonNuclearPowerPlantsSoldForwardUnderFinancialHedges
Namespace Prefix: | etr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Planned generation sold forward from non utility nuclear power plants for the remainder of the period + References No definition available. + Details
Name: | etr_Plannedgenerationsoldforwardfromnonutilitynuclearpowerplantsfortheremainderoftheperiod
Namespace Prefix: | etr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Risk Management and Fair Values. + References No definition available. + Details
Name: | etr_RiskManagementAndFairValuesTextualAbstract
Namespace Prefix: | etr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total planned generation for remainder of the period + References No definition available. + Details
Name: | etr_Totalplannedgenerationforremainderoftheperiod
Namespace Prefix: | etr_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | duration

X
- Definition Total volume of natural gas swaps outstanding. + References No definition available. + Details
Name: | etr_VolumeOfNaturalGasSwapsOutstanding
Namespace Prefix: | etr_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | instant

X
- Definition Volume of Financial Transmission Rights Outstanding + References No definition available. + Details
Name: | etr_VolumeofFinancialTransmissionRightsOutstanding
Namespace Prefix: | etr_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | instant

X
- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
Name: | us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
Name: | us-gaap_CollateralAlreadyPostedAggregateFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226016-175313 + Details
Name: | us-gaap_DerivativeCollateralObligationToReturnCash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The net gain (loss) recognized in earnings during the period due to ineffectiveness in price risk cash flow hedges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
Name: | us-gaap_GainLossOnPriceRiskCashFlowHedgeIneffectiveness
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unrealized gain (loss) related to derivatives designated as cash flow hedging instruments, recorded in results of operations to the extent that the cash flow hedge is determined to be ineffective. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
Name: | us-gaap_UnrealizedGainLossOnCashFlowHedgingInstruments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=etr_EntergyArkansasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=etr_EntergyLouisianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=etr_EntergyMississippiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=etr_EntergyNewOrleansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=etr_EntergyTexasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=etr_ElectricityFuturesForwardsSwapsAndOptionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=etr_FinancialTransmissionRightsFTRsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=etr_EntergyWholesaleCommoditiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |