Supplemental Financial Statement Data (Schedule of Statement of Earnings) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jan. 26, 2020	Jan. 27, 2019	Jan. 26, 2020	Jan. 27, 2019
Amortization of Intangible Assets		$ 11	$ 12	$ 22	$ 23
Net periodic benefits expense (income), other than the service cost		(34)	(20)	(57)	(40)
Investment (gains) / losses		0	(2)	4	7
Loss on sale of business	[1]	0	0	64	0
Other Income		(1)	(2)	(1)	(2)
Other expenses / (income)		$ (22)	$ (8)	$ 34	$ (8)

[1] See Note 3 for additional information