Leases - Lessor Arrangements, Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Apr. 25, 2020	Jul. 27, 2019
Future Minimum Lease Payments, After Topic 842 Adoption [Abstract]
2020 (remaining three months)	$ 207
2021	923
2022	517
2023	302
2024	149
Thereafter	71
Total	2,169
Less: Present value of lease payments	2,048
Difference between undiscounted cash flows and discounted cash flows	$ 121
Future Minimum Lease Payments, Prior to Topic 842 Adoption [Abstract]
2020		$ 1,028
2021		702
2022		399
2023		185
2024		53
Total		$ 2,367