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	3 Months Ended	9 Months Ended
	Apr. 27, 2019	Apr. 27, 2019	Apr. 28, 2018	Jul. 28, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 282	$ 332
Fiscal 2018 Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges				$ 600
Restructuring charges	$ 18	282
Cumulative restructuring charges incurred	390	390
Fiscal 2017 Plan
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges incurred	$ 1,000	$ 1,000