Restructuring and Other Charges (Additional Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 24, 2015	Oct. 25, 2014	Jul. 26, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 142
FISCAL 2015 PLAN
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		$ 318
Cumulative restructuring charges	630
FISCAL 2015 PLAN | Cost of Sales and Operating Expenses
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	141
FISCAL 2015 PLAN | Cost of sales
Restructuring Cost and Reserve [Line Items]
Credit to cost of sales	1
FISCAL 2015 PLAN | Expected Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and Related Cost, Expected Cost	$ 700
FISCAL 2014 PLAN
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring charges			$ 418