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Balance Sheet Details - Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions	Jan. 27, 2017	Apr. 29, 2016
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 3,234	$ 3,385
Short-term	1,699	1,794
Long-term	1,535	1,591
Deferred product revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	97	68
Deferred services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	2,941	3,100
Financed unearned services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 196	$ 217

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