Leases (Rent Expenses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Rent Expense	$ 63.7	$ 69.9	$ 75.3
Entergy Arkansas [Member]
Rent Expense	12.0	12.6	13.4
Entergy Gulf States Louisiana [Member]
Rent Expense	10.9	11.9	12.2
Entergy Louisiana [Member]
Rent Expense	10.1	11.2	12.2
Entergy Mississippi [Member]
Rent Expense	4.6	5.5	5.2
Entergy New Orleans [Member]
Rent Expense	1.3	1.5	1.7
Entergy Texas [Member]
Rent Expense	4.1	6.4	8.4
System Energy [Member]
Rent Expense	$ 2.5	$ 1.5	$ 1.6