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Asset Retirement Obligations Asset Retirement Obligations (Narrative) (Details) $ in Millions | Mar. 31, 2018 USD ($)
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Entergy Louisiana [Member] |
Increase in decommissioning liability | $ 85.4

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- Definition Increase in decommissioning liability. + References No definition available. + Details
Name: | etr_IncreaseInDecommissioningLiability
Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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