Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Notes Payable By Variable Interest Entities) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Five Point Six Nine Percent Series I Notes Due July Two Thousand Fourteen [Member] | Entergy Arkansas VIE [Member]
Notes payable by variable interest entities
Amount	$ 70
Three Point Two Three Percent Series J Notes Due July Two Thousand Sixteen [Member] | Entergy Arkansas VIE [Member]
Notes payable by variable interest entities
Amount	55
Three Point Two Five Percent Series Q Due July Two Thousand Seventeen [Member] | Entergy Gulf States Louisiana VIE [Member]
Notes payable by variable interest entities
Amount	75
Five Point Six Nine Percent Series E Notes Due July Two Thousand Fourteen [Member] | Entergy Louisiana VIE [Member]
Notes payable by variable interest entities
Amount	50
Three Point Three Percent Series F Note Due March Two Thousand Sixteen [Member] | Entergy Louisiana VIE [Member]
Notes payable by variable interest entities
Amount	20
Three Point Two Five Percent Series G Due July Two Thousand Seventeen [Member] | Entergy Louisiana VIE [Member]
Notes payable by variable interest entities
Amount	25
Six Point Two Nine Percent Series F Notes Due September Two Thousand Thirteen [Member] | System Energy VIE [Member]
Notes payable by variable interest entities
Amount	70
Five Point Three Three Percent Series G Notes Due April Two Thousand Fifteen [Member] | System Energy VIE [Member]
Notes payable by variable interest entities
Amount	60
Four Point Zero Two Percent Series H Notes Due February Two Thousand Seventeen [Member] | System Energy VIE [Member]
Notes payable by variable interest entities
Amount	50
Two Point Six Two Percent Series K Notes Due December Two Thousand Seventeen [Member] | Entergy Arkansas VIE [Member]
Notes payable by variable interest entities
Amount	60
Three Point Three Eight Percent Series R Notes Due August Two Thousand Twenty [Member] | Entergy Gulf States Louisiana VIE [Member]
Notes payable by variable interest entities
Amount	$ 70