Balance Sheet Details - Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions	Oct. 30, 2015	Apr. 24, 2015
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 3,046	$ 3,197
Short-term	1,609	1,724
Long-term	1,437	1,473
Deferred product revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	20	17
Deferred services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	2,913	3,075
Financed unearned services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 113	$ 105