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Revenue - Summary of Components of Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions	Oct. 26, 2018	Apr. 27, 2018	Oct. 27, 2017	Apr. 28, 2017
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	$ 3,206	$ 3,363	$ 3,059	$ 3,213
Short-term	1,538	1,712
Long-term	1,668	1,651
Deferred product revenue
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	102	107
Deferred services revenue
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	3,010	3,134
Financed unearned services revenue
Contract With Customer Liability [Line Items]
Deferred revenue and financed unearned services revenue	$ 94	$ 122

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Contract with customer liability.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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