Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Sep. 30, 2013	Mar. 31, 2013
Parent Company [Member]
Reduction Of Repair And Maintenance Tax Decuction	$ 348
Entergy Arkansas [Member]
Reduction Of Repair And Maintenance Tax Decuction	114
Entergy Gulf States Louisiana [Member]
Reduction Of Repair And Maintenance Tax Decuction	34
Entergy Louisiana [Member]
Reduction Of Repair And Maintenance Tax Decuction	22
Income Tax Credit Distribution To Parent		20.6
Entergy Mississippi [Member]
Reduction Of Repair And Maintenance Tax Decuction	43
Entergy New Orleans
Increase In Repair And Maintenance Tax Deduction	2
Entergy Texas [Member]
Reduction Of Repair And Maintenance Tax Decuction	$ 137