Commitments And Contingencies (Narrative) (Details) (Entergy Arkansas [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Entergy Arkansas [Member]
Commitments And Contingencies [Abstract]
Course Of Construction Sublimit	$ 50

Nuclear Electric Insurance Limited course of construction sublimit applicable to any loss associated with the lifting apparatus failure and stator drop at ANO.

No definition available.

Name:	etr_CourseOfConstructionSublimit
Namespace Prefix:	etr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration