Restructuring and Other Charges (Schedule of Activities Related to Restructuring and Other Charges) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jan. 26, 2019	Jan. 26, 2019	Jan. 27, 2018
Restructuring Reserve [Roll Forward]
Liability as of beginning period		$ 73	$ 117
Charges		264	250
Cash payments		(237)	(240)
Non-cash items		(42)	(15)
Liability as of ending period	$ 58	58	112
FISCAL 2017 AND PRIOR PLANS | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period		41	74
Charges		0	223
Cash payments		(31)	(213)
Non-cash items		0	3
Liability as of ending period	10	10	87
FISCAL 2017 AND PRIOR PLANS | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period		13	43
Charges		(1)	27
Cash payments		(3)	(27)
Non-cash items		0	(18)
Liability as of ending period	9	9	$ 25
FISCAL 2018 PLAN
Restructuring Reserve [Roll Forward]
Charges	186	264
FISCAL 2018 PLAN | Employee Severance
Restructuring Reserve [Roll Forward]
Liability as of beginning period		19
Charges		222
Cash payments		(202)
Non-cash items		0
Liability as of ending period	39	39
FISCAL 2018 PLAN | Other
Restructuring Reserve [Roll Forward]
Liability as of beginning period		0
Charges		43
Cash payments		(1)
Non-cash items		(42)
Liability as of ending period	$ 0	$ 0