Restructuring Charges - Activities Related to Restructuring Reserves (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jan. 29, 2021	Jan. 24, 2020	Jan. 29, 2021	Jan. 24, 2020
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period			$ 1	$ 19
Net charges	$ 0	$ 0	42	21
Cash payments			(41)	(34)
Other			0	(4)
Balance at end of period	2	2	2	2
August 2020 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period			0
Net charges			37
Cash payments			(35)
Other			0
Balance at end of period	2		2
May 2020 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period			0
Net charges			5
Cash payments			(5)
Other			0
Balance at end of period	0		0
May 2019 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period			1	0
Net charges			0	21
Cash payments			(1)	(20)
Other			0	0
Balance at end of period	$ 0	1	$ 0	1
April 2019 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period				15
Net charges				0
Cash payments				(14)
Other				0
Balance at end of period		1		1
November 2016 Restructuring
Restructuring Cost and Reserve [Line Items]
Balance at beginning of period				4
Net charges				0
Cash payments				0
Other				(4)
Balance at end of period		$ 0		$ 0