Restructuring and Other Charges (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jan. 23, 2016	Jan. 24, 2015	Jan. 23, 2016	Jan. 24, 2015	Jul. 26, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			$ 238
FISCAL 2015 PLAN
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges	$ 725		725
FISCAL 2015 PLAN | Cost of Sales and Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	95	$ 69	236	$ 387
FISCAL 2015 PLAN | Cost of sales
Restructuring Cost and Reserve [Line Items]
Credit to cost of sales	1		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]
Cumulative restructuring charges					$ 418