Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 24, 2014	Jan. 25, 2013	Jan. 24, 2014	Jan. 25, 2013	Apr. 26, 2013
Income Tax Contingency [Line Items]
Effective tax rate from continuing operations	20.20%	14.50%	18.80%	19.30%
Net benefit associated with finalization of certain income tax returns and changes to uncertain tax position reserves	$ 19
Gross unrecognized tax benefits	1,170		1,170		1,068
Accrued income tax interest and penalties	116		116
Unrecognized tax benefits that would impact effective tax rate	1,131		1,131
Current Liaibilities [Member] | Tax Years 2009 Through 2011 [Member]
Income Tax Contingency [Line Items]
Gross unrecognized tax benefits	$ 51		$ 51