Balance Sheet Details - Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions	Jan. 29, 2016	Apr. 24, 2015
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 3,125	$ 3,197
Short-term	1,684	1,724
Long-term	1,441	1,473
Deferred product revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	48	17
Deferred services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	2,905	3,075
Financed unearned services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 172	$ 105