Restructuring and Other Charges (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 30, 2016	Apr. 25, 2015	Apr. 30, 2016	Apr. 25, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 255
FISCAL 2015 PLAN
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges	$ 743		743
FISCAL 2015 PLAN | Cost of Sales and Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	18	$ 24	254	$ 411
FISCAL 2015 PLAN | Cost of sales
Restructuring Cost and Reserve [Line Items]
Credit to cost of sales			2
FISCAL 2015 PLAN | Expected Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	750		750
FISCAL 2014 PLAN
Restructuring Cost and Reserve [Line Items]
Credit to cost of sales	1	$ 0	1	$ 0
Cumulative restructuring charges	$ 417		$ 417