Balance Sheet Details - Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions	Jul. 31, 2015	Apr. 24, 2015
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 3,066	$ 3,197
Short-term	1,639	1,724
Long-term	1,427	1,473
Deferred product revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	25	17
Deferred services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	2,934	3,075
Financed unearned services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 107	$ 105