Income Taxes (Details Textuals) (USD $) In Millions	6 Months Ended
Jun. 30, 2011
Income Taxes (Textuals) [Abstract]
Reversal of deferred taxes and liabilities for uncertain tax positions	$ 41

Name:

etr_ReversalOfDeferredTaxesAndLiabilitiesForUncertainTaxPositions

Namespace Prefix:

etr

Data Type:

xbrli:monetaryItemType

Balance Type:

debit

Period Type:

duration