Restructuring and Other Charges - Schedule of Activities Related to Restructuring and Other Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 24, 2020	Oct. 26, 2019
Restructuring Reserve [Roll Forward]
Liability as of beginning period	$ 72	$ 33
Charges	602	184
Cash payments	(330)	(155)
Non-cash items	(11)	(15)
Liability as of ending period	333	47
FISCAL 2020 AND PRIOR PLANS | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period	58
Charges	0
Cash payments	(58)
Non-cash items	0
Liability as of ending period	0
FISCAL 2020 AND PRIOR PLANS | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period	14
Charges	0
Cash payments	0
Non-cash items	0
Liability as of ending period	14
FISCAL 2021 PLAN
Restructuring Reserve [Roll Forward]
Charges	602
FISCAL 2021 PLAN | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period	0
Charges	590
Cash payments	(272)
Non-cash items	0
Liability as of ending period	318
FISCAL 2021 PLAN | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period	0
Charges	12
Cash payments	0
Non-cash items	(11)
Liability as of ending period	$ 1
FISCAL 2018 AND PRIOR PLANS | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period		22
Charges		175
Cash payments		(154)
Non-cash items		0
Liability as of ending period		43
FISCAL 2018 AND PRIOR PLANS | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period		11
Charges		9
Cash payments		(1)
Non-cash items		(15)
Liability as of ending period		$ 4