Revenue - Summary of Activity Related to Deferred Revenue and Financed Unearned Services Revenue (Detail) - USD ($) $ in Millions	9 Months Ended
	Jan. 29, 2021	Jan. 24, 2020
Contract With Customer Liability [Abstract]
Balance at beginning of period	$ 3,698	$ 3,668
Additions	2,269	1,759
Revenue recognized during the period	(2,139)	(1,854)
Balance at end of period	$ 3,828	$ 3,573