Restructuring and Other Charges (Additional Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 28, 2018	Jul. 29, 2017	Jul. 30, 2016	Aug. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credit)	$ 358	$ 756	$ 268
Cost of sales
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credit)			$ (2)
Fiscal 2018 Plan
Restructuring Cost and Reserve [Line Items]
Expected pretax restructuring charges	300
Fiscal 2017 plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,000
Fiscal 2015 plan
Restructuring Cost and Reserve [Line Items]
Cumulative pre-tax restructuring charges				$ 756
Employee Severance and Other Restructuring | Fiscal 2018 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring charges (credit)	$ 108