Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Per Share data, unless otherwise specified	Apr. 26, 2014	Jul. 27, 2013
Statement of Financial Position [Abstract]
Accounts receivable, net of allowance for doubtful accounts of $247 at April 26, 2014 and $228 at July 27, 2013	$ 247	$ 228
Preferred Stock, No Par Value	$ 0	$ 0
Preferred stock, shares authorized	5	5
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	20,000	20,000
Common stock, shares issued	5,116	5,389
Common stock, shares outstanding	5,116	5,389