Asset Retirement Obligations (Cumulative Decommissioning And Retirement Cost Liabilities And Expenses) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Entergy Arkansas [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities	$ 680.7	$ 640.2
Accretion	43.1	40.5
Liabilities	723.8	680.7
Entergy Gulf States Louisiana [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities	380.8	359.8
Accretion	22.3	21.0
Liabilities	403.1	380.8
Entergy Louisiana [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities	418.1	345.8
Accretion	21.6	23.4
Change in Cash Flow Estimate	39.4	48.9
Liabilities	479.1	418.1
Entergy Mississippi [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities	6.0	5.7
Accretion	0.4	0.3
Liabilities	6.4	6.0
Entergy New Orleans [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities	2.2	2.9
Accretion	0.1	0.2
Spending	0	(0.9)
Liabilities	2.3	2.2
Entergy Texas [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities	4.1	3.9
Accretion	0.2	0.2
Liabilities	4.3	4.1
System Energy [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities	478.4	445.4
Accretion	35.5	33.0
Change in Cash Flow Estimate	102.3	0
Liabilities	616.2	478.4
Entergy Wholesale Commodities [Member]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Liabilities	1,543.3	1,492.9
Accretion	125.3	119.4
Change in Cash Flow Estimate	38.6	(58.5)
Spending	(9.0)	(10.5)
Liabilities	$ 1,698.2	$ 1,543.3