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Condensed Consolidated Balance Sheets (Parenthetical)
Jul. 31, 2016
$ / shares
shares
Statement of Financial Position [Abstract]  
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01
Preferred stock, shares authorized 300,000,000
Preferred stock, shares issued 0
Preferred stock, shares outstanding 0
Common stock, par value (in dollars per share) | $ / shares $ 0.01
Common stock, shares authorized 9,600,000,000
Common stock, shares issued 1,664,000,000
Common stock, shares outstanding 1,664,000,000