Asset Retirement Obligations (Narrative) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Entergy Louisiana [Member]	Dec. 31, 2012 Entergy Louisiana [Member]	Dec. 31, 2013 System Energy [Member]	Dec. 31, 2012 System Energy [Member]	Mar. 31, 2013 Entergy Wholesale Commodities [Member]	Dec. 31, 2012 Entergy Wholesale Commodities [Member]	Jun. 30, 2012 Entergy Wholesale Commodities [Member]	Dec. 31, 2013 Vermont Yankee [Member]	Dec. 31, 2013 Vermont Yankee [Member] Entergy Wholesale Commodities [Member]	Sep. 30, 2013 Vermont Yankee [Member] Entergy Wholesale Commodities [Member]	Dec. 31, 2013 Grand Gulf [Member] System Energy [Member]	Jun. 30, 2012 Waterford 3 [Member] Entergy Louisiana [Member]
Reduction in decommissioning liability							$ 46,600,000	$ 34,100,000	$ 60,600,000
Decommissioning expense								34,100,000	49,000,000
Increase in decommissioning liability			39,400,000								27,200,000	58,000,000	102,300,000	48,900,000
NRC minimum for decommissioning financial assurance for license termination											569,100,000
Decommissioning Fund Investments	4,903,144,000	4,190,108,000	347,274,000	287,418,000	603,896,000	490,572,000				40,000,000	612,100,000
Present value of the difference between the stipulated contract amount for decommissioning the plants less the decommissioning cost	$ 572,600,000