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Balance Sheet Details - Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions	Apr. 27, 2018	Apr. 28, 2017
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 3,477	$ 3,342
Short-term	1,804	1,744
Long-term	1,673	1,598
Deferred product revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	119	124
Deferred services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	3,236	2,999
Financed unearned services revenue
Deferred Revenue And Credits [Line Items]
Deferred revenue and financed unearned services revenue	$ 122	$ 219

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