Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 24, 2014	Oct. 25, 2013	Oct. 24, 2014	Oct. 25, 2013	Apr. 25, 2014
Income Tax Contingency [Line Items]
Effective tax rate from continuing operations	19.00%	19.20%	19.30%	18.20%
Gross unrecognized tax benefits	$ 1,293		$ 1,293		$ 1,172
Accrued income tax interest and penalties	171		171
Unrecognized tax benefits that would impact effective tax rate	$ 1,173		$ 1,173