Leases - Lessor Arrangements, Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Jan. 25, 2020	Jul. 27, 2019
Future Minimum Lease Payments, After Topic 842 Adoption [Abstract]
2020 (remaining six months)	$ 438
2021	882
2022	479
2023	267
2024	123
Thereafter	58
Total	2,247
Less: Present value of lease payments	2,117
Difference between undiscounted cash flows and discounted cash flows	$ 130
Future Minimum Lease Payments, Prior to Topic 842 Adoption [Abstract]
2020		$ 1,028
2021		702
2022		399
2023		185
2024		53
Total		$ 2,367