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Income Taxes - Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Apr. 26, 2019	Apr. 27, 2018	Apr. 28, 2017
Income Tax Disclosure [Abstract]
Balance at beginning of period	$ 348	$ 218	$ 216
Additions based on tax positions related to the current year	11	131	7
Additions for tax positions of prior years	26	0	7
Decreases for tax positions of prior years	(35)	(1)	0
Settlements	(54)	0	(12)
Balance at end of period	$ 296	$ 348	$ 218

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Amount of unrecognized tax benefits.

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-Name Accounting Standards Codification
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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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