Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Oct. 30, 2015	Oct. 24, 2014	Oct. 30, 2015	Oct. 24, 2014	Apr. 24, 2015
Income Tax Disclosure [Abstract]
Tax charge, primarily associated with internal reorganization of certain businesses	$ 442
Effective tax rate from continuing operations	52.00%	19.00%	33.80%	19.30%
Gross unrecognized tax benefits	$ 2,602		$ 2,602		$ 2,860
Accrued income tax interest and penalties	588		588
Unrecognized tax benefits that would impact effective tax rate	2,022		2,022
Gross unrecognized tax benefits, current liability	5		5
Gross unrecognized tax benefits, long-term liability	$ 2,597		$ 2,597