Restructuring and Other Charges (Schedule Of Activities Related To Restructuring And Other Charges) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 28, 2017	Oct. 29, 2016
Restructuring Reserve [Roll Forward]
Liability as of beginning period	$ 117	$ 45
Charges	152	411
Cash payments	(95)	(270)
Non-cash items	(6)	(47)
Liability as of ending period	168	139
FISCAL 2017 AND PRIOR PLANS | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period	74	21
Charges	145	369
Cash payments	(79)	(269)
Non-cash items	0	(4)
Liability as of ending period	140	117
FISCAL 2017 AND PRIOR PLANS | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period	43	24
Charges	7	42
Cash payments	(16)	(1)
Non-cash items	(6)	(43)
Liability as of ending period	$ 28	$ 22