Rate And Regulatory Matters (Prior Years' Rough Production Cost Equalization Rates) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012 Entergy Arkansas [Member]	Dec. 31, 2011 Entergy Arkansas [Member]	Oct. 31, 2011 Entergy Arkansas [Member]	Dec. 31, 2011 Entergy Gulf States Louisiana [Member]	Oct. 31, 2011 Entergy Gulf States Louisiana [Member]	Dec. 31, 2012 Entergy Louisiana [Member]	Dec. 31, 2011 Entergy Mississippi [Member]	Oct. 31, 2011 Entergy Mississippi [Member]	Dec. 31, 2012 Entergy New Orleans [Member]	Dec. 31, 2011 Entergy New Orleans [Member]	Oct. 31, 2011 Entergy New Orleans [Member]	Dec. 31, 2012 Entergy Texas [Member]	Oct. 31, 2011 Entergy Texas [Member]	Dec. 31, 2010 Production Cost Based On 2009 [Member] Entergy Arkansas [Member]	Dec. 31, 2010 Production Cost Based On 2009 [Member] Entergy Louisiana [Member]	Dec. 31, 2010 Production Cost Based On 2009 [Member] Entergy Mississippi [Member]	Dec. 31, 2009 Production Cost Based On 2008 [Member] Entergy Arkansas [Member]	Dec. 31, 2009 Production Cost Based On 2008 [Member] Entergy Gulf States Louisiana [Member]	Dec. 31, 2009 Production Cost Based On 2008 [Member] Entergy Louisiana [Member]	Dec. 31, 2009 Production Cost Based On 2008 [Member] Entergy Mississippi [Member]	Dec. 31, 2009 Production Cost Based On 2008 [Member] Entergy Texas [Member]	Dec. 31, 2008 Production Cost Based On 2007 [Member] Entergy Arkansas [Member]	Dec. 31, 2008 Production Cost Based On 2007 [Member] Entergy Gulf States Louisiana [Member]	Dec. 31, 2008 Production Cost Based On 2007 [Member] Entergy Louisiana [Member]	Dec. 31, 2008 Production Cost Based On 2007 [Member] Entergy Mississippi [Member]	Dec. 31, 2008 Production Cost Based On 2007 [Member] Entergy New Orleans [Member]	Dec. 31, 2008 Production Cost Based On 2007 [Member] Entergy Texas [Member]	Dec. 31, 2007 Production Cost Based On 2006 [Member] Entergy Arkansas [Member]	Dec. 31, 2007 Production Cost Based On 2006 [Member] Entergy Gulf States Louisiana [Member]	Dec. 31, 2007 Production Cost Based On 2006 [Member] Entergy Louisiana [Member]	Dec. 31, 2007 Production Cost Based On 2006 [Member] Entergy Mississippi [Member]	Dec. 31, 2007 Production Cost Based On 2006 [Member] Entergy Texas [Member]
Regulatory Assets [Line Items]
Payments (receipts) based on production costs	$ 41	$ 77	$ 156	$ (12)	$ (75)	$ (41)	$ (40)	$ (33)	$ (17)	$ (25)	$ (5)	$ 17	$ (43)	$ 41	$ (22)	$ (19)	$ 390	$ (107)	$ (140)	$ (24)	$ (119)	$ 252	$ (124)	$ (36)	$ (20)	$ (7)	$ (65)	$ 252	$ (120)	$ (91)	$ (41)	$ (30)