Rate And Regulatory Matters (Fuel And Purchased Power Cost Recovery) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Deferred fuel costs	$ 150,363,000	$ 209,776,000
Entergy Arkansas [Member]
Deferred fuel costs	97,305,000	209,776,000
Entergy Gulf States Louisiana [Member]
Deferred fuel costs	99,200,000	2,900,000
Purchase power and capacity cost	100,100,000
Entergy Louisiana [Member]
Deferred fuel costs	26,568,000	0
Purchase power and capacity cost	68,000,000
Entergy Mississippi [Member]
Deferred fuel costs	26,490,000	0
Entergy New Orleans [Member]
Deferred fuel costs	1,900,000	(7,500,000)
Purchase power and capacity cost	4,100,000
Entergy Texas [Member]
Deferred fuel costs	$ (93,300,000)	$ (64,700,000)