Consolidated Balance Sheets (Parentheticals) (USD $) In Millions, except Share data, unless otherwise specified	Jul. 31, 2012	Jul. 31, 2011
Allowance for Doubtful Accounts Receivable, Current	$ 46	$ 20
Preferred Stock, Par or Stated Value Per Share	$ 0.01
Preferred Stock, Shares Authorized	1,345,000
Preferred Stock, Shares Issued	0
Preferred Stock, Shares Outstanding	0
Common Stock, Par or Stated Value Per Share	$ 0.01
Common Stock, Shares Authorized	750,000,000
Common Stock, Shares, Outstanding	295,289,000	300,597,000
Series A Preferred Stock [Member]
Preferred Stock, Shares Authorized	145,000
Series B Preferred Stock [Member]
Preferred Stock, Shares Authorized	250,000