Leases (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 27, 2019	Jul. 29, 2019	Jul. 28, 2019
Leases [Abstract]
Operating Lease, Payments	$ 19
Finance Lease, Interest Payment on Liability	0
Finance Lease, Principal Payments	0
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	46
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	0
Operating Leases divested with business sold	6
Short-term borrowings	1,631		$ 1,371
Accounting Standards Update 2016-02 [Member]
Leases [Abstract]
Short-term borrowings	$ (20)	$ (20)