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Restructuring and Other Charges (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 27, 2018	Jan. 28, 2017	Jan. 27, 2018	Jan. 28, 2017	Oct. 28, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 250	$ 544
Fiscal 2017 Plan
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges					$ 150
Cumulative restructuring charges incurred	$ 1,000		1,000
Restructuring charges	$ 98	$ 133	$ 250	$ 544