Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Short-Term Borrowings And The Outstanding Short-Term Borrowings) (Details) $ in Millions	Dec. 31, 2016 USD ($)
Entergy Arkansas [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized	$ 250.0
Borrowings	51.2
Entergy Louisiana [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized	450.0
Borrowings	0.0
Entergy Mississippi [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized	175.0
Borrowings	0.0
Entergy New Orleans [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized	100.0
Borrowings	0.0
Entergy Texas [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized	200.0
Borrowings	0.0
System Energy [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized	200.0
Borrowings	$ 0.0