Valuation And Qualifying Accounts (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 29, 2012		Jul. 31, 2011		Aug. 01, 2010
Balance at Beginning of Period	$ 11		$ 17		$ 19
Charged to (Reduction in) Costs and Expenses	113		113		115
Deductions	(114)		(119)		(117)
Balance at End of Period	10		11		17
Actual returns	122		145		130
Cash Discount [Member]
Balance at Beginning of Period	5		5		5
Charged to (Reduction in) Costs and Expenses	112		113		116
Deductions	(113)		(113)		(116)
Balance at End of Period	4		5		5
Bad Debt Reserve [Member]
Balance at Beginning of Period	2		4		3
Charged to (Reduction in) Costs and Expenses	1		2		2
Deductions	(1)		(4)		(1)
Balance at End of Period	2		2		4
Returns Reserve [Member]
Balance at Beginning of Period	4	[1]	8	[1]	11	[1]
Charged to (Reduction in) Costs and Expenses	0	[1]	(2)	[1]	(3)	[1]
Deductions	0	[1]	(2)	[1]	0	[1]
Balance at End of Period	$ 4	[1]	$ 4	[1]	$ 8	[1]
Maximum [Member]
Percentage Of Actual Returns	2.00%		2.00%		2.00%

[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 $122 in 2012, $145 in 2011, and $130 in 2010, or less than 2% of net sales.