Restructuring and Other Charges - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
Oct. 24, 2020	Oct. 26, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 602	$ 184
Fiscal 2021 Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	900
Restructuring charges	602
Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	300
Cumulative restructuring charges incurred	$ 255

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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