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Asset Retirement Obligations (Narrative) (Details) (Entergy Arkansas [Member], USD $) In Millions, unless otherwise specified | Mar. 31, 2014
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Entergy Arkansas [Member] |
Increase in decommissioning liability | $ 43.6

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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