Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Notes Payable By Variable Interest Entities) (Details) $ in Millions	Dec. 31, 2015 USD ($)
Three Point Two Three Percent Series J Notes Due July Two Thousand Sixteen [Member] | Entergy Arkansas VIE [Member]
Notes payable by variable interest entities
Debt Instrument, Interest Rate, Stated Percentage	3.23%
Amount	$ 55
Two Point Six Two Percent Series K Notes Due December Two Thousand Seventeen [Member] | Entergy Arkansas VIE [Member]
Notes payable by variable interest entities
Debt Instrument, Interest Rate, Stated Percentage	2.62%
Amount	$ 60
Three Point Two Five Percent Series Q Due July Two Thousand Seventeen [Member] | Entergy Louisiana River Bend VIE [Member]
Notes payable by variable interest entities
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Amount	$ 75
Three Point Three Eight Percent Series R Due August Two Thousand Twenty [Member] | Entergy Louisiana River Bend VIE [Member]
Notes payable by variable interest entities
Debt Instrument, Interest Rate, Stated Percentage	3.38%
Amount	$ 70
Three Point Three Percent Series F Note Due March Two Thousand Sixteen [Member] | Entergy Louisiana Waterford VIE [Member]
Notes payable by variable interest entities
Debt Instrument, Interest Rate, Stated Percentage	3.30%
Amount	$ 20
Three Point Two Five Percent Series G Due July Two Thousand Seventeen [Member] | Entergy Louisiana Waterford VIE [Member]
Notes payable by variable interest entities
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Amount	$ 25
Three Point Nine Two Percent Series H Dues February Two Thousand Twenty One [Member] | Entergy Louisiana Waterford VIE [Member]
Notes payable by variable interest entities
Debt Instrument, Interest Rate, Stated Percentage	3.92%
Amount	$ 40
Four Point Zero Two Percent Series H Notes Due February Two Thousand Seventeen [Member] | System Energy VIE [Member]
Notes payable by variable interest entities
Debt Instrument, Interest Rate, Stated Percentage	4.02%
Amount	$ 50
Three Point Seven Eight Percent Series I Due October Two Thousand Eighteen [Member] | System Energy VIE [Member]
Notes payable by variable interest entities
Debt Instrument, Interest Rate, Stated Percentage	3.78%
Amount	$ 85
Three Point Six Five Percent Series L Notes Due July Two Thousand Twenty One [Member] | Entergy Arkansas VIE [Member]
Notes payable by variable interest entities
Debt Instrument, Interest Rate, Stated Percentage	3.65%
Amount	$ 90