Income Taxes (Breakdown Between Current And Noncurrent Net Deferred Tax Assets) (Details) - USD ($) $ in Millions	Jul. 25, 2015	Jul. 26, 2014
Income Tax Disclosure [Abstract]
Deferred tax assets—current	$ 2,915	$ 2,808
Deferred tax liabilities—current	(212)	(134)
Deferred tax assets—noncurrent	1,648	1,700
Deferred tax liabilities—noncurrent	(246)	(369)
Total net deferred tax assets	$ 4,105	$ 4,005