Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Jul. 30, 2017	Jul. 31, 2016	Aug. 02, 2015
Beginning Balance		$ 12	$ 13	$ 12
Charged to (Reduction in) Cost and Expense		109	117	118
Deductions		(110)	(118)	(117)
Ending Balance		11	12	13
Actual Returns		103	95	105
Reserve for Cash Discount [Member]
Beginning Balance		4	5	4
Charged to (Reduction in) Cost and Expense		109	116	116
Deductions		(109)	(117)	(115)
Ending Balance		4	4	5
Allowance for Doubtful Accounts [Member]
Beginning Balance		3	4	3
Charged to (Reduction in) Cost and Expense		0	(1)	2
Deductions		(1)	0	(1)
Ending Balance		2	3	4
Allowance for Sales Returns [Member]
Beginning Balance	[1]	5	4	5
Charged to (Reduction in) Cost and Expense	[1]	0	2	0
Deductions	[1]	0	(1)	(1)
Ending Balance	[1]	$ 5	$ 5	$ 4
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 $103 in 2017, $95 in 2016 and $105 in 2015, or less than 2% of net sales.