Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jul. 25, 2014	Jul. 26, 2013	Apr. 25, 2014
Income Tax Contingency [Line Items]
Effective tax rate from continuing operations	19.60%	17.30%
Gross unrecognized tax benefits	$ 1,234		$ 1,172
Accrued income tax interest and penalties	157
Unrecognized tax benefits that would impact effective tax rate	$ 1,138