Statements of Changes in Common Equity (ENTERGY MISSISSIPPI, INC.) (USD $) In Thousands	Total		Entergy Mississippi	Common Stock	Common Stock Entergy Mississippi	Capital Stock Expense and Other [Member] Entergy Mississippi	Retained Earnings		Retained Earnings Entergy Mississippi
Beginning Balance at Dec. 31, 2008	$ 8,060,592		$ 668,717	$ 2,482	$ 199,326	$ (690)	$ 7,382,719		$ 470,081
Net income	1,251,050	[1]	79,367				1,231,092	[1]	79,367
Common stock	(576,956)		(51,300)						(51,300)
Preferred stock	(19,958)		(2,828)						(2,828)
Ending Balance at Dec. 31, 2009	8,707,360		693,956	2,548	199,326	(690)	8,043,122		495,320
Net income	1,270,305	[1]	85,377				1,250,242	[1]	85,377
Common stock	(603,854)		(43,400)						(43,400)
Preferred stock	(20,063)		(2,828)						(2,828)
Ending Balance at Dec. 31, 2010	8,590,400		733,105	2,548	199,326	(690)	8,689,401		534,469
Net income	1,367,372	[1]	108,729				1,346,439	[1]	108,729
Common stock	(589,605)		(3,300)						(3,300)
Preferred stock	(20,933)		(2,828)						(2,828)
Ending Balance at Dec. 31, 2011	$ 9,055,270		$ 835,706	$ 2,548	$ 199,326	$ (690)	$ 9,446,960		$ 637,070

[1] Consolidated net income and preferred dividend requirements of subsidiaries for 2011, 2010 and 2009 include $13.3 million of preferred dividends on subsidiaries' preferred stock without sinking fund that is not presented as equity.