Revenue - Summary of Activity Related to Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions	6 Months Ended
	Oct. 30, 2020	Oct. 25, 2019
Contract With Customer Liability [Abstract]
Balance at beginning of period	$ 3,698	$ 3,668
Additions	1,364	1,011
Revenue recognized during the period	(1,411)	(1,211)
Balance at end of period	$ 3,651	$ 3,468