Income Taxes (Narrative) (Details) (USD $)	1 Months Ended	3 Months Ended	12 Months Ended			3 Months Ended			1 Months Ended	12 Months Ended			1 Months Ended		3 Months Ended		12 Months Ended			1 Months Ended			3 Months Ended				12 Months Ended			1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended						1 Months Ended
	Sep. 30, 2013	Jun. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2013 State Net Operating Loss Carryover [Member]	Dec. 31, 2012 Parent Company [Member]	Dec. 31, 2009 Parent Company [Member]	Sep. 30, 2013 Entergy Arkansas [Member]	Dec. 31, 2013 Entergy Arkansas [Member]	Dec. 31, 2012 Entergy Arkansas [Member]	Dec. 31, 2011 Entergy Arkansas [Member]	Sep. 30, 2013 Entergy Gulf States Louisiana [Member]	Jun. 30, 2012 Entergy Gulf States Louisiana [Member]	Jun. 30, 2012 Entergy Gulf States Louisiana [Member]	Sep. 30, 2008 Entergy Gulf States Louisiana [Member]	Dec. 31, 2013 Entergy Gulf States Louisiana [Member]	Dec. 31, 2012 Entergy Gulf States Louisiana [Member]	Dec. 31, 2011 Entergy Gulf States Louisiana [Member]	Sep. 30, 2013 Entergy Louisiana [Member]	Mar. 31, 2013 Entergy Louisiana [Member]	Jun. 30, 2012 Entergy Louisiana [Member]	Dec. 31, 2012 Entergy Louisiana [Member]	Jun. 30, 2012 Entergy Louisiana [Member]	Sep. 30, 2011 Entergy Louisiana [Member]	Sep. 30, 2008 Entergy Louisiana [Member]	Dec. 31, 2013 Entergy Louisiana [Member]	Dec. 31, 2012 Entergy Louisiana [Member]	Dec. 31, 2011 Entergy Louisiana [Member]	Sep. 30, 2013 Entergy Mississippi [Member]	Dec. 31, 2013 Entergy Mississippi [Member]	Dec. 31, 2012 Entergy Mississippi [Member]	Dec. 31, 2011 Entergy Mississippi [Member]	Sep. 30, 2013 Entergy New Orleans [Member]	Dec. 31, 2013 Entergy New Orleans [Member]	Dec. 31, 2012 Entergy New Orleans [Member]	Dec. 31, 2011 Entergy New Orleans [Member]	Sep. 30, 2013 Entergy Texas [Member]	Dec. 31, 2013 Entergy Texas [Member]	Dec. 31, 2012 Entergy Texas [Member]	Dec. 31, 2011 Entergy Texas [Member]	Dec. 31, 2013 System Energy [Member]	Dec. 31, 2012 System Energy [Member]	Dec. 31, 2011 System Energy [Member]	Aug. 31, 2008 Hurricane Rita [Member] Entergy Gulf States Louisiana [Member]	Jul. 31, 2008 Hurricane Rita [Member] Entergy Louisiana [Member]
Income Taxes [Line Items]
Reduction in taxable income relating to 2009 CAM settlement								$ 5,700,000,000
Increase in taxable income related to Louisiana Act 55 financing														104,000,000								129,000,000
Deferred tax asset relating to 2004 CAM settlement, net of interest charges							155,000,000
Additional tax depreciation relating to 2004 CAM settlement																							547,000,000
Increase in taxable income relating to 2004 CAM settlement							2,970,000,000
Valuation allowance on the deferred tax assets related to state net operating loss carryovers			23,500,000
Unrecognized tax benefits if recognized, would lower the effective income tax rates			176,000,000	203,000,000	521,000,000					600,000	600,000	0					44,000,000	44,000,000	107,900,000				92,400,000				87,900,000	92,400,000	281,300,000		3,900,000	3,900,000	3,800,000		0	0	0		10,100,000	8,600,000	7,300,000	3,300,000	3,500,000	0
Remaining balances of unrecognized tax benefits, effective income tax rates			4,417,000,000	3,968,000,000	3,867,000,000
Accrued income tax interest and penalties			96,400,000	146,300,000	99,000,000					15,200,000	21,800,000	11,400,000					17,000,000	33,100,000	14,400,000				900,000				1,000,000	900,000	800,000		2,100,000	2,400,000	1,700,000		900,000	100,000	2,400,000		800,000	700,000	100,000	19,000,000	33,200,000	18,500,000
Income recognized for tax purpose under wholesale electric power purchase agreements			1,500,000,000
Gain recognized for income tax purpose on formation of a wholly-owned subsidiary			1,030,000,000
Future additional tax depreciation																											1,030,000,000
Reversal of deferred tax liabilities and liabilities for uncertain tax positions																									422,000,000
Regulatory charges																											199,000,000
Reduction in net operating loss carryover			2,500,000,000
Proceeds from the LA Act 55 financing																274,700,000										679,000,000
Income tax benefit resulting from Act 55 financing settlement		172,000,000													20,000,000									143,000,000
Regulatory charge resulting from tax settlement															28,000,000									137,000,000
Net-of-tax regulatory charge resulting from tax settlement															17,000,000									84,000,000
Regulatory Liabilities											12,200,000						35,300,000	22,000,000					9,200,000				37,000,000	9,200,000
Proceeds from LURC																																													274,700,000	679,000,000
Proceed from loan by LCDA to corporation LURC																																													274,700,000	679,000,000
Reduction in taxable income due to accounting changes					1,300,000,000							292,000,000							132,000,000										185,000,000				48,000,000				13,000,000				45,000,000			180,000,000
(Reduction) Increase in repairs and maintenance tax deduction as a result of IRS regulations	(348,000,000)								(114,000,000)				(34,000,000)							(22,000,000)										(43,000,000)				2,000,000				(137,000,000)
Adjustment 2009 CAM								9,300,000,000
Deferred Income Taxes and Tax Credits			311,789,000	(26,479,000)	(280,029,000)					130,707,000	(67,482,000)	94,410,000					86,125,000	92,523,000	(4,845,000)								310,964,000	(59,069,000)	(327,046,000)		47,878,000	58,221,000	(3,443,000)		(7,427,000)	15,016,000	(35,276,000)		86,152,000	123,167,000	56,219,000	29,996,000	43,651,000	14,923,000
Distribution of income tax credits to Parent																					20,600,000
Reduction in valuation allowance due to prospective utilization of a loss carryover						44,000,000
Reduction in valuation allowance due to prospective utilization of a loss carryover, net of Federal tax effect						$ 28,000,000