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Restructuring and Other Charges - Schedule of Activities Related to Restructuring and Other Charges (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jan. 23, 2021	Jan. 23, 2021	Jan. 25, 2020
Restructuring Reserve [Roll Forward]
Liability as of beginning period		$ 72	$ 33
Charges		836	226
Cash payments		(767)	(203)
Non-cash items		(21)	(23)
Liability as of ending period	$ 120	120	33
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	0
FISCAL 2020 AND PRIOR PLANS \| Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period		14
Charges		2
Cash payments		(3)
Non-cash items		0
Liability as of ending period	13	13
FISCAL 2021 PLAN
Restructuring Reserve [Roll Forward]
Charges	232	834
FISCAL 2021 PLAN \| Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period		0
Charges		804
Cash payments		(703)
Non-cash items		0
Liability as of ending period	101	101
FISCAL 2021 PLAN \| Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period		0
Charges		30
Cash payments		(3)
Non-cash items		(21)
Liability as of ending period	$ 6	$ 6
FISCAL 2018 AND PRIOR PLANS \| Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period			22
Charges			209
Cash payments			(202)
Non-cash items			0
Liability as of ending period			29
FISCAL 2018 AND PRIOR PLANS \| Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period			11
Charges			17
Cash payments			(1)
Non-cash items			(23)
Liability as of ending period			$ 4