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.

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Name:	us-gaap_RestructuringCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring and Other Charges - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 25, 2020	Jul. 27, 2019	Jul. 28, 2018	Sep. 03, 2020
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 481	$ 322	$ 358
Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Expected pretax restructuring charges	300
Restructuring charges	$ 255
Subsequent event \| Fiscal 2021 Plan
Restructuring Cost and Reserve [Line Items]
Expected pretax restructuring charges				$ 900