Leases - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended
	Apr. 25, 2020 USD ($)	Apr. 25, 2020 USD ($)
Leases [Abstract]
Operating lease right-of-use asset	$ 930	$ 930
Operating lease liabilities	998	998
Operating lease liabilities, current	344	344
Operating lease liabilities, noncurrent	$ 654	$ 654
Weighted-average remaining lease term (in years)	4 years	4 years
Weighted-average discount rate	1.70%	1.70%
Sales-type lease terms, on average	4 years	4 years
Interest income, lease receivables	$ 23	$ 72
Operating lease income	$ 49	$ 143