Restructuring and Other Charges - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jan. 23, 2021	Jan. 23, 2021	Jan. 25, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 836	$ 226
Fiscal 2021 Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	$ 900	900
Restructuring charges	232	834
Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	300	300
Cumulative restructuring charges incurred	$ 257	$ 257

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
-Publisher FASB
-Name Accounting Standards Codification
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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
-Publisher FASB
-Name Accounting Standards Codification
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration