Restructuring and Other Charges (Schedule Of Activities Related To Restructuring And Other Charges) (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 24, 2015	Oct. 25, 2014
Restructuring Reserve [Roll Forward]
Liability as of beginning period	$ 89
Gross charges	142
Cash payments	(129)
Non-cash items	(16)
Liability as of ending period	86
FISCAL 2014 PLAN | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period	11
Gross charges	0
Cash payments	(4)
Non-cash items	0
Liability as of ending period	7
FISCAL 2014 PLAN | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period	14
Gross charges	0
Cash payments	(1)
Non-cash items	0
Liability as of ending period	13
FISCAL 2015 PLAN
Restructuring Reserve [Roll Forward]
Gross charges		$ 318
FISCAL 2015 PLAN | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period	49
Gross charges	125
Cash payments	(119)
Non-cash items	0
Liability as of ending period	55
FISCAL 2015 PLAN | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period	15
Gross charges	17
Cash payments	(5)
Non-cash items	(16)
Liability as of ending period	$ 11