Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Jul. 31, 2016	Jul. 31, 2015
Allowance for Doubtful Accounts Receivable, Current	$ 51	$ 45
Preferred Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized (in shares)	1,345,000	1,345,000
Preferred Stock, Shares Issued (in shares)
Preferred Stock, Shares Outstanding (in shares)
Common Stock, Par or Stated Value Per Share (in dollars per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized (in shares)	750,000,000	750,000,000
Common Stock, Shares, Outstanding (in shares)	257,853,000	277,706,000
Series A Preferred Stock
Preferred Stock, Shares Authorized (in shares)	145,000	145,000
Series B Preferred Stock
Preferred Stock, Shares Authorized (in shares)	250,000	250,000