Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 23, 2015	Jan. 24, 2014	Jan. 23, 2015	Jan. 24, 2014	Apr. 25, 2014
Income Tax Contingency [Line Items]
Effective tax rate from continuing operations	18.20%	20.20%	18.90%	18.80%
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Amount	$ 30
Gross unrecognized tax benefits	1,362		1,362		1,172
Accrued income tax interest and penalties	184		184
Unrecognized tax benefits that would impact effective tax rate	$ 1,212		$ 1,212