Segment Information and Major Customers - Additional Information (Details) $ in Millions	3 Months Ended
Oct. 24, 2020 USD ($) segment	Oct. 26, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of geographic segments \| segment	3
Revenue	$ 11,929	$ 13,159
United States
Segment Reporting Information [Line Items]
Revenue	$ 6,500	$ 7,100

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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+ Details