Leases - Operating Lease Balances (Details) - USD ($) $ in Millions	May 01, 2021	Jul. 25, 2020
Leases [Abstract]
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other assets	Other assets
Operating lease right-of-use assets	$ 928	$ 921
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Other current liabilities	Other current liabilities
Operating lease liabilities	$ 335	$ 341
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other long-term liabilities	Other long-term liabilities
Operating lease liabilities	$ 671	$ 661
Total operating lease liabilities	$ 1,006	$ 1,002