Asset Retirement Obligations (Fair Values Of Decommissioning Trust Funds And Related Asset Retirement Obligation Regulatory Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
ANO 1 and ANO 2 [Member]
Asset Retirement Obligations [Line Items]
Decommissioning Trust Fair Values	$ 600.6	$ 541.7
Regulatory Asset	204.0	181.5
River Bend [Member]
Asset Retirement Obligations [Line Items]
Decommissioning Trust Fair Values	477.4	420.9
Regulatory Asset		5.5
Regulatory Liabilities	(1.7)
Waterford 3 [Member]
Asset Retirement Obligations [Line Items]
Decommissioning Trust Fair Values	287.4	254.0
Regulatory Asset	126.7	116.1
Grand Gulf [Member]
Asset Retirement Obligations [Line Items]
Decommissioning Trust Fair Values	490.6	423.4
Regulatory Asset	58.9	59.6
Entergy Wholesale Commodities [Member]
Asset Retirement Obligations [Line Items]
Decommissioning Trust Fair Values	$ 2,334.1	$ 2,148.0