Balance Sheets (ENTERGY MISSISSIPPI, INC.) (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2011	Dec. 31, 2010
COMMON EQUITY
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	254,752,788	254,752,788
Entergy Mississippi
COMMON EQUITY
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	12,000,000	12,000,000
Common stock, shares issued	8,666,357	8,666,357
Common stock, shares outstanding	8,666,357	8,666,357