Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Jul. 28, 2019	Jul. 29, 2018	Jul. 30, 2017
Beginning Balance		$ 18	$ 8	$ 9
Charged to (Reduction in) Cost and Expense		131	119	108
Deductions		(136)	(115)	(109)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired		0	6	0
Ending Balance		13	18	8
Cash Discounts [Member]
Beginning Balance		6	4	4
Charged to (Reduction in) Cost and Expense		132	114	109
Deductions		(132)	(114)	(109)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired		0	2	0
Ending Balance		6	6	4
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Beginning Balance		3	1	1
Charged to (Reduction in) Cost and Expense		1	1	0
Deductions		(1)	(1)	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired		0	2	0
Ending Balance		3	3	1
Sales Returns and Allowances [Member]
Beginning Balance	[1]	9	3	4
Charged to (Reduction in) Cost and Expense	[1]	(2)	4	(1)
Deductions	[1]	(3)	0	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired	[1]	0	2	0
Ending Balance	[1]	4	9	3
Actual Returns		$ 107	$ 104	$ 102
Maximum [Member] | Sales Returns and Allowances [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 $107 in 2019, $104 in 2018, and $102 in 2017, or less than 2% of net sales