Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018
Beginning Balance		$ 13	$ 18	$ 8
Charged to (Reduction in) Cost and Expense		142	131	119
Deductions		(140)	(136)	(115)
Valuation Allowances And Reserves Reserves Of Businesses Divested		(1)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired			0	6
Ending Balance		14	13	18
Cash Discounts [Member]
Beginning Balance		6	6	4
Charged to (Reduction in) Cost and Expense		139	132	114
Deductions		(139)	(132)	(114)
Valuation Allowances And Reserves Reserves Of Businesses Divested		0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired			0	2
Ending Balance		6	6	6
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
Beginning Balance		3	3	1
Charged to (Reduction in) Cost and Expense		2	1	1
Deductions		0	(1)	(1)
Valuation Allowances And Reserves Reserves Of Businesses Divested		(1)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired			0	2
Ending Balance		4	3	3
Sales Returns and Allowances [Member]
Beginning Balance	[1]	4	9	3
Charged to (Reduction in) Cost and Expense	[1]	1	(2)	4
Deductions	[1]	(1)	(3)	0
Valuation Allowances And Reserves Reserves Of Businesses Divested	[1]	0
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired	[1]		0	2
Ending Balance	[1]	4	4	9
Actual Returns		$ 99	$ 107	$ 104
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 $99 in 2020, $107 in 2019, and $104 in 2018, or less than 2% of net sales