Rate And Regulatory Matters (Payments/Receipts Among The Utility Operating Companies) (Details) - USD ($) $ in Millions	1 Months Ended
	May. 31, 2014	Oct. 31, 2011	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007
Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Net payments or receipts among utility operating companies pursuant to FERC order	$ 68	$ 156
Payments (receipts) based on production costs			$ 0	$ 38	$ 0	$ 41	$ 77	$ 41	$ 390	$ 252	$ 252
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Net payments or receipts among utility operating companies pursuant to FERC order	(10)	(75)
Payments (receipts) based on production costs			0	(38)	0	(41)	(12)	(22)	(247)	(160)	(211)
Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Net payments or receipts among utility operating companies pursuant to FERC order	(11)	(33)
Payments (receipts) based on production costs			0	16	0	0	(40)	(19)	(24)	(20)	(41)
Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Net payments or receipts among utility operating companies pursuant to FERC order	2	(5)
Payments (receipts) based on production costs			(15)	(1)	(15)	0	(25)	0	0	(7)	0
Entergy Texas [Member]
Regulatory Assets [Line Items]
Net payments or receipts among utility operating companies pursuant to FERC order	$ (49)	$ (43)
Payments (receipts) based on production costs			$ 15	$ (15)	$ 15	$ 0	$ 0	$ 0	$ (119)	$ (65)	$ (30)