Income Taxes (Additional Information) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jul. 30, 2016	Jul. 25, 2015	Jul. 26, 2014
Income Tax [Line Items]
Undistributed earnings of certain foreign subsidiaries on which tax is not provided	$ 65,600
Gross income tax benefit attributable to tax incentives	$ 1,200	$ 1,400	$ 1,300
Gross Income Tax Benefit attributable to tax incentives (Per Diluted Share)	$ 0.23	$ 0.28	$ 0.25
Unrecognized Tax Benefits, reduced	$ 457	$ 30	$ 13
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	1,200
Net interest expense, reduction related to unrecognized tax beneifts	55	37
Penalties, reduction related to unrecognized tax benefits	40	3
Unrecognized Tax Benefits, Interest on Income Taxes Expense			20
Unrecognized Tax Benefits, Income Tax Penalties Expense			8
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	154	274	$ 304
Unrecognized tax benefit that could be reduced in next 12 months	150
R&D tax credit- current & prior fiscal years
Income Tax [Line Items]
R&D tax benefit	226	138
R&D tax credit- fiscal 2015
Income Tax [Line Items]
R&D tax benefit	81	$ 78
Federal income tax settlement (Year 2008-2010)
Income Tax [Line Items]
Unrecognized Tax Benefits, reduced	563
Accrued income tax interest reduction, tax settlement	63
Federal income tax settlement (Year 2008-2010) | Include reduction of interest expense
Income Tax [Line Items]
Net tax benefit to the income tax provision	367
Federal income tax settlement (Year 2008-2010) | Reduced tax interest expense upon tax settlement [Member]
Income Tax [Line Items]
Net tax benefit to the income tax provision	21
Federal
Income Tax [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 466
Operating loss carry forwards, expiration	Jul. 28, 2018
Tax Credit Carryforward, Amount	$ 8
Tax Credit Carryforward, Expiration Date	Jul. 29, 2017
State and Local Jurisdiction
Income Tax [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 735
Operating loss carry forwards, expiration	Jul. 28, 2018
Tax Credit Carryforward, Amount	$ 734
Tax Credit Carryforward, Valuation Allowance	32
Foreign Tax Authority [Member]
Income Tax [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards	$ 809
Operating loss carry forwards, expiration	Jul. 29, 2017
Net Operating Loss, Valuation Allowance	$ 97
Tax Credit Carryforward, Amount	$ 20
Tax Credit Carryforward, Expiration Date	Jul. 28, 2018