Leases (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2021	Nov. 01, 2020
Leases [Abstract]
Operating Lease, Payments	$ 19	$ 21
Finance Lease, Principal Payments	4	1
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	14	6
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 13	$ 2