Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Jul. 29, 2018	Jul. 30, 2017	Jul. 31, 2016
Beginning Balance		$ 11	$ 12	$ 13
Charged to (Reduction in) Cost and Expense		123	109	117
Deductions		(120)	(110)	(118)
Valuation Allowances and Reserves, Reserves of Businesses Acquired		6	0	0
Ending Balance		20	11	12
Reserve for Cash Discount [Member]
Beginning Balance		4	4	5
Charged to (Reduction in) Cost and Expense		117	109	116
Deductions		(117)	(109)	(117)
Valuation Allowances and Reserves, Reserves of Businesses Acquired		2	0	0
Ending Balance		6	4	4
Allowance for Doubtful Accounts [Member]
Beginning Balance		2	3	4
Charged to (Reduction in) Cost and Expense		1	0	(1)
Deductions		(2)	(1)	0
Valuation Allowances and Reserves, Reserves of Businesses Acquired		2	0	0
Ending Balance		3	2	3
Allowance for Sales Returns [Member]
Beginning Balance	[1]	5	5	4
Charged to (Reduction in) Cost and Expense	[1]	5	0	2
Deductions	[1]	(1)	0	(1)
Valuation Allowances and Reserves, Reserves of Businesses Acquired	[1]	2	0	0
Ending Balance	[1]	11	5	5
Actual Returns		$ 106	$ 103	$ 95
Maximum [Member] | Allowance for Sales Returns [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 $106 in 2018, $103 in 2017, and $95 in 2016, or less than 2% of net sales.