Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Jul. 25, 2015	Jul. 26, 2014
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 302	$ 265
Preferred stock, par value (in dollars per share)	$ 0
Preferred stock, shares authorized (in shares)	5
Preferred stock, issued (in shares)	0
Preferred stock, outstanding (in shares)	0
Common stock, par value (in dollars per share)	$ 0.001
Common stock, shares authorized (in shares)	20,000
Common stock, shares issued (in shares)	5,085	5,107
Common stock, shares outstanding (in shares)	5,085	5,107