Restructuring and Other Charges (Schedule of Activities Related to Restructuring and Other Charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 28, 2018	Jul. 29, 2017	Jul. 30, 2016
Restructuring Reserve [Roll Forward]
Liability, beginning of period	$ 117	$ 45	$ 89
Charges	358	756	268
Cash payments	(372)	(606)	(279)
Non-cash items	(30)	(78)	(33)
Liability, end of period	73	117	45
FISCAL 2017 AND PRIOR YEAR PLANS | Employee Severance
Restructuring Reserve [Roll Forward]
Liability, beginning of period	74	21	60
Charges	227	625	225
Cash payments	(262)	(569)	(264)
Non-cash items	2	(3)	0
Liability, end of period	41	74	21
FISCAL 2017 AND PRIOR YEAR PLANS | Other
Restructuring Reserve [Roll Forward]
Liability, beginning of period	43	24	29
Charges	23	131	43
Cash payments	(35)	(37)	(15)
Non-cash items	(18)	(75)	(33)
Liability, end of period	13	43	24
FISCAL 2018 PLAN | Employee Severance
Restructuring Reserve [Roll Forward]
Liability, beginning of period	0	0	0
Charges	92	0	0
Cash payments	(73)	0	0
Non-cash items	0	0	0
Liability, end of period	19	0	0
FISCAL 2018 PLAN | Other
Restructuring Reserve [Roll Forward]
Liability, beginning of period	0	0	0
Charges	16	0	0
Cash payments	(2)	0	0
Non-cash items	(14)	0	0
Liability, end of period	$ 0	$ 0	$ 0