Restructuring and Other Charges (Schedule of Activities Related to Restructuring and Other Charges) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 25, 2015
Restructuring Reserve [Roll Forward]
Liability, beginning of period	$ 45	$ 89	$ 69
Charges	756	268	484
Cash payments	(606)	(279)	(459)
Non-cash items	(78)	(33)	(5)
Liability, end of period	117	45	89
FISCAL 2015 AND PRIOR YEAR PLANS | Employee Severance
Restructuring Reserve [Roll Forward]
Liability, beginning of period	21	60	40
Charges	0	225	464
Cash payments	(16)	(264)	(442)
Non-cash items	(4)	0	(2)
Liability, end of period	1	21	60
FISCAL 2015 AND PRIOR YEAR PLANS | Other
Restructuring Reserve [Roll Forward]
Liability, beginning of period	24	29	29
Charges	0	43	20
Cash payments	(8)	(15)	(17)
Non-cash items	(9)	(33)	(3)
Liability, end of period	7	24	29
FISCAL 2017 PLAN | Employee Severance
Restructuring Reserve [Roll Forward]
Liability, beginning of period	0	0	0
Charges	625		0
Cash payments	(553)	0	0
Non-cash items	1	0	0
Liability, end of period	73	0	0
FISCAL 2017 PLAN | Other
Restructuring Reserve [Roll Forward]
Liability, beginning of period	0	0	0
Charges	131		0
Cash payments	(29)	0	0
Non-cash items	(66)	0	0
Liability, end of period	$ 36	$ 0	$ 0