Restructuring and Other Charges - Schedule of Activities Related to Restructuring and Other Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 27, 2019	Jul. 28, 2018	Jul. 29, 2017
Restructuring Reserve [Roll Forward]
Liability, beginning of period	$ 73	$ 117	$ 45
Charges	322	358	756
Cash payments	(299)	(372)	(606)
Non-cash items	(63)	(30)	(78)
Liability, end of period	33	73	117
FISCAL 2017 AND PRIOR YEAR PLANS | Employee Severance
Restructuring Reserve [Roll Forward]
Liability, beginning of period	41	74	21
Charges	0	227	625
Cash payments	(41)	(262)	(569)
Non-cash items	0	2	(3)
Liability, end of period	0	41	74
FISCAL 2017 AND PRIOR YEAR PLANS | Other
Restructuring Reserve [Roll Forward]
Liability, beginning of period	13	43	24
Charges	(1)	23	131
Cash payments	(7)	(35)	(37)
Non-cash items	0	(18)	(75)
Liability, end of period	5	13	43
FISCAL 2018 PLAN | Employee Severance
Restructuring Reserve [Roll Forward]
Liability, beginning of period	19	0	0
Charges	252	92	0
Cash payments	(248)	(73)	0
Non-cash items	(1)	0	0
Liability, end of period	22	19	0
FISCAL 2018 PLAN | Other
Restructuring Reserve [Roll Forward]
Liability, beginning of period	0	0	0
Charges	71	16	0
Cash payments	(3)	(2)	0
Non-cash items	(62)	(14)	0
Liability, end of period	$ 6	$ 0	$ 0