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
	Oct. 27, 2018	Oct. 28, 2017	Jul. 28, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 78	$ 152
Fiscal 2018 Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges	300		$ 300
Fiscal 2018 Plan \| Employee Severance and Other Restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring charges	186
FISCAL 2017 PLAN
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges incurred	$ 1,000