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. 27, 2019	Jul. 28, 2018	Jul. 29, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credit)	$ 322	$ 358	$ 756
Fiscal 2018 Plan
Restructuring Cost and Reserve [Line Items]
Expected pretax restructuring charges	600
Cumulative pre-tax restructuring charges	430
Fiscal 2017 plan
Restructuring Cost and Reserve [Line Items]
Cumulative pre-tax restructuring charges	1,000
Employee Severance and Other Restructuring \| Fiscal 2018 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credit)	$ 322