Restructuring and Other Charges (Schedule of Activities Related to Restructuring and Other Charges) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Apr. 27, 2019	Apr. 27, 2019	Apr. 28, 2018
Restructuring Reserve [Roll Forward]
Liability as of beginning period		$ 73	$ 117
Charges		282	332
Cash payments		(275)	(325)
Non-cash items		(46)	(20)
Liability as of ending period	$ 34	34	104
FISCAL 2017 AND PRIOR PLANS | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period		41	74
Charges		0	223
Cash payments		(34)	(245)
Non-cash items		0	4
Liability as of ending period	7	7	56
FISCAL 2017 AND PRIOR PLANS | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period		13	43
Charges		(1)	27
Cash payments		(7)	(30)
Non-cash items		0	(18)
Liability as of ending period	5	5	22
FISCAL 2018 PLAN
Restructuring Reserve [Roll Forward]
Charges	18	282
FISCAL 2018 PLAN | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period		19	0
Charges		232	75
Cash payments		(232)	(49)
Non-cash items		0	0
Liability as of ending period	19	19	26
FISCAL 2018 PLAN | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period		0	0
Charges		51	7
Cash payments		(2)	(1)
Non-cash items		(46)	(6)
Liability as of ending period	$ 3	$ 3	$ 0