Restructuring Charges and Cost Savings Initiatives (Schedule Of Restructuring Activity And Related Reserves) (Details) - 2015 Initiatives [Member] - USD ($) $ in Millions		3 Months Ended			12 Months Ended
		Oct. 29, 2017		Oct. 30, 2016	Jul. 30, 2017		Jul. 31, 2016	Aug. 02, 2015
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost		$ 19		$ 9	$ 58		$ 82	$ 124
Severance Pay And Benefits [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period	[1]	26
Restructuring and Related Cost, Incurred Cost		2
Cash Payments		(10)
Accrued Balance at end of period		18	[2]		26	[1]
Restructuring Reserve, Noncurrent		2			$ 2
Other Cost Savings Implementation Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	[3]	12
Asset Impairment Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost		$ 5

[1] Includes $2 of severance pay and benefits recorded in Other liabilities in the Consolidated Balance Sheet.

[2] Includes $2 of severance pay and benefits recorded in Other liabilities in the Consolidated Balance Sheet.

[3] Includes other costs recognized as incurred that are not reflected in the restructuring reserve in the Consolidated Balance Sheet. The costs are included in Administrative expenses and Cost of products sold in the Consolidated Statements of Earnings.