Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Short-Term Borrowings And The Outstanding Short-Term Borrowings) (Details) - USD ($)	Oct. 01, 2015	Sep. 30, 2015
Entergy Arkansas [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized		$ 250,000,000
Borrowings		0
Entergy Louisiana [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized		250,000,000
Borrowings		0
Entergy Louisiana [Member] | Subsequent Event [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized	$ 450,000,000
Entergy Mississippi [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized		175,000,000
Borrowings		0
Entergy New Orleans [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized		100,000,000
Borrowings		0
Entergy Texas [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized		200,000,000
Borrowings		0
System Energy [Member]
Short-term borrowings and the outstanding short-term borrowings
Authorized		200,000,000
Borrowings		$ 0