Valuation and Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 28, 2013		Jul. 29, 2012		Jul. 31, 2011
Beginning Balance	$ 10		$ 11		$ 17
Charged to (Reduction in) Cost and Expense	116		113		113
Deductions	(115)		(114)		(119)
Ending Balance	11		10		11
Actual Returns	124		122		145
Percentage Of Actual Returns	2.00%		2.00%		2.00%
Reserve for Cash Discount [Member]
Beginning Balance	4		5		5
Charged to (Reduction in) Cost and Expense	114		112		113
Deductions	(113)		(113)		(113)
Ending Balance	5		4		5
Allowance for Doubtful Accounts [Member]
Beginning Balance	2		2		4
Charged to (Reduction in) Cost and Expense	1		1		2
Deductions	(1)		(1)		(4)
Ending Balance	2		2		2
Allowance for Sales Returns [Member]
Beginning Balance	4	[1]	4	[1]	8	[1]
Charged to (Reduction in) Cost and Expense	1	[1]			(2)	[1]
Deductions	(1)	[1]			(2)	[1]
Ending Balance	$ 4	[1]	$ 4	[1]	$ 4	[1]

[1] The returns reserve is evaluated quarterly and adjusted accordingly. During each period, returns are charged to net sales in the Consolidated Statements of Earnings as incurred. Actual returns were approximately $124 in 2013, $122 in 2012, and $145 in 2011, or approximately 2% of net sales.