Business Combinations (Details) - USD ($) $ in Millions		12 Months Ended
	Jun. 16, 2014	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Business Combinations (Textuals)
Goodwill		$ 1,266	$ 1,323	$ 1,100
Check Inc.
Business Combinations (Textuals)
Cost of acquired entity	$ 369
Purchase consideration	342
Fair value of assumed equity awards	27
Fair value of assumed equity awards, expected service period, in years		4 years
Net tangible assets acquired	14
Intangible assets acquired	35
Goodwill	$ 293