Restructuring and Other Charges (Schedule of Activities Related to Restructuring and Other Charges) (Details) - USD ($) $ in Millions	9 Months Ended
	Apr. 28, 2018	Apr. 29, 2017
Restructuring Reserve [Roll Forward]
Liability as of beginning period	$ 117	$ 45
Charges	332	614
Cash payments	(325)	(489)
Non-cash items	(20)	(64)
Liability as of ending period	104	106
FISCAL 2017 PLAN | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period	74
Charges	223
Cash payments	(245)
Non-cash items	4
Liability as of ending period	56
FISCAL 2017 PLAN | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period	43
Charges	27
Cash payments	(30)
Non-cash items	(18)
Liability as of ending period	22
FISCAL 2018 PLAN | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period	0
Charges	75
Cash payments	(49)
Non-cash items	0
Liability as of ending period	26
FISCAL 2018 PLAN | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period	0
Charges	7
Cash payments	(1)
Non-cash items	(6)
Liability as of ending period	$ 0
FISCAL 2017 AND PRIOR PLANS | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period		21
Charges		510
Cash payments		(463)
Non-cash items		(7)
Liability as of ending period		61
FISCAL 2017 AND PRIOR PLANS | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period		24
Charges		104
Cash payments		(26)
Non-cash items		(57)
Liability as of ending period		$ 45