Borrowings (Schedule Of Short-Term Debt) (Details) - USD ($)	Jan. 28, 2017	Jul. 30, 2016
Short-term Debt [Line Items]
Amount	$ 4,451,000,000	$ 4,160,000,000
Current portion of long-term debt
Short-term Debt [Line Items]
Amount	$ 4,151,000,000	$ 4,159,000,000
Effective Rate	1.26%	0.97%
Commercial paper
Short-term Debt [Line Items]
Amount	$ 300,000,000	$ 0
Effective Rate	0.73%	0.00%
Other notes and borrowings
Short-term Debt [Line Items]
Amount	$ 0	$ 1,000,000
Effective Rate	0.00%	2.08%