Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Oct. 31, 2011	Oct. 31, 2010
Consolidated Balance Sheets
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	300	300
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	9,600	9,600
Common stock, shares issued	1,991	2,204
Common stock, shares outstanding	1,991	2,204