Statements of Changes in Common Equity (ENTERGY MISSISSIPPI, INC.) (Unaudited) (USD $) In Thousands	Total		Common Stock	Retained Earnings		Entergy Mississippi	Entergy Mississippi Common Stock	Entergy Mississippi Capital Stock Expense and Other [Member]	Entergy Mississippi Retained Earnings
Beginning Balance at Dec. 31, 2009	$ 8,707,360		$ 2,548	$ 8,043,122		$ 688,765	$ 199,326	$ (690)	$ 490,129
Net income	539,097	[1]		529,064	[1]	45,462			45,462
Common stock	(298,796)					(20,200)			(20,200)
Preferred stock	(10,033)					(1,414)			(1,414)
Ending Balance at Jun. 30, 2010	8,864,738		2,548	8,273,153		712,613	199,326	(690)	513,977
Beginning Balance at Mar. 31, 2010
Net income	320,283					34,269
Ending Balance at Jun. 30, 2010	8,864,738		2,548			712,613	199,326	(690)
Beginning Balance at Dec. 31, 2010	8,590,400		2,548	8,689,401		726,224	199,326	(690)	527,588
Net income	574,277	[1]		564,246	[1]	41,142			41,142
Common stock	(296,355)					(3,300)			(3,300)
Preferred stock	(10,031)					(1,414)			(1,414)
Ending Balance at Jun. 30, 2011	8,691,566		2,548	8,957,516		762,652	199,326	(690)	564,016
Beginning Balance at Mar. 31, 2011
Net income	320,598					23,872
Ending Balance at Jun. 30, 2011	$ 8,691,566		$ 2,548			$ 762,652	$ 199,326	$ (690)

[1] Consolidated net income and preferred dividend requirements of subsidiaries for both 2010 and 2011 include $6.6 million of preferred dividends on subsidiaries' preferred stock without sinking fund that is not presented as equity.