CONDENSED CONSOLIDATED BALANCE SHEET (Unaudited) (Parenthetical) (USD $)	Jan. 31, 2013	Oct. 31, 2012
Stockholders' Equity Attributable to Parent [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	125,000,000	125,000,000
Preferred stock, issued and outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	2,000,000,000	2,000,000,000
Common stock, issued and outstanding (in shares)	598,000,000	595,000,000
Treasury stock at cost, shares (in shares)	251,000,000	249,000,000