Leases (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 02, 2020	Jul. 29, 2019
Operating Lease, Payments	$ 79
Finance Lease, Principal Payments	2
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	88
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	10
Operating Leases divested with business sold	18
Finance leases divested with business sold	$ 5
Accounting Standards Update 2016-02 [Member]
Build-to-suit Lease Commitment Liability Derecognized		$ 20