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Rate And Regulatory Matters Rate and Regulatory Matters (Payments/Receipts Among The Utility Operating Companies) (Details) $ in Millions | Mar. 31, 2018 USD ($)
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Entergy Arkansas [Member] |
Payments (receipts) based on production costs | $ 6
Entergy New Orleans [Member] |
Payments (receipts) based on production costs | 2
Entergy Texas [Member] |
Payments (receipts) based on production costs | $ (8)

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- Definition Payments (receipts) based on production costs. + References No definition available. + Details
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Namespace Prefix: | etr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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