Shareholders' Equity (Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jul. 30, 2016		Jul. 25, 2015
Stockholders' Equity Note [Abstract]
Cumulative Shares Repurchased, Beginning balance (in shares)	4,443		4,288
Repurchase of Common Stock During Period (in shares)	148	[1]	155	[2]
Cumulative Shares Repurchased, Ending balance (in shares)	4,591		4,443
Cumulative Weighted Average Price Per Share Of Stock Repurchased, Value	$ 20.86		$ 20.63
Cumulative weighted average price per share repurchased	26.45		27.22
Cumulative Weighted Average Price Per Share Of Stock Repurchased, Value	$ 21.04		$ 20.86
Cumulative Stock Repurchased and Retired Value	$ 92,679		$ 88,445
Stock Repurchased and Retired During Period, Value	3,918	[1]	4,234	[2]
Cumulative Stock Repurchased and Retired Value	$ 96,597		$ 92,679

[1] Includes stock repurchases of $45 million, which were pending settlement as of July 30, 2016.

[2] Includes stock repurchases of $36 million, which were pending settlement as of July 25, 2015.