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Balance Sheet Details - Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions	Jul. 28, 2017	Apr. 28, 2017
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 3,251	$ 3,342
Short-term	1,702	1,744
Long-term	1,549	1,598
Deferred product revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	123	124
Deferred services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	2,942	2,999
Financed unearned services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 186	$ 219

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