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Restructuring and Other Charges (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Apr. 28, 2018	Apr. 28, 2018	Apr. 29, 2017	Oct. 28, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 332	$ 614
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	82	82
FISCAL 2017 PLAN
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges				$ 150
Cumulative restructuring charges incurred	$ 1,000	$ 1,000