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Restructuring and Other Charges - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 26, 2019	Oct. 27, 2018	Jul. 28, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 184	$ 78
Fiscal 2018 Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges			$ 600
Restructuring charges	184
Cumulative restructuring charges incurred	614
Restructuring cost, expected cost remaining	$ 0