Leases - Supplemental Information (Details) - USD ($) $ in Millions	9 Months Ended
	May 01, 2021	Apr. 25, 2020
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities — operating cash flows	$ 306	$ 309
Right-of-use assets obtained in exchange for operating leases liabilities	$ 270	$ 120