Property, Plant, And Equipment (Significant Unobservable Inputs) (Details)	Jul. 31, 2013
Property, Plant And Equipment [Abstract]
Operating Margin Used In Asset Valuation	7.00%
Weighted Average Cost Of Capital Used In Asset Valuation	7.50%

The long-term pre-tax operating margin (cash-basis) used in the valuation.

No definition available.

Name:	etr_OperatingMarginUsedInAssetValuation
Namespace Prefix:	etr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant