Restructuring Charges and Cost Savings Initiatives (Schedule Of Restructuring Activity And Related Reserves) (Details) - USD ($) $ in Millions		12 Months Ended
		Jul. 30, 2017		Jul. 31, 2016		Aug. 02, 2015
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Noncurrent		$ 2		$ 17
2015 Initiatives [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost		58		82		$ 124
2015 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period		73	[1]	85	[2]	0
Restructuring and Related Cost, Incurred Cost		7		34		87
Cash Payments		(54)		(46)		(1)
Restructuring Reserve, Translation Adjustment						1
Accrued Balance at end of period		26	[3]	73	[1]	85	[2]
Restructuring Reserve, Noncurrent		2		17		45
2015 Initiatives [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period		0		8		0
Restructuring and Related Cost, Incurred Cost		0		1		8
Cash Payments		0		(9)		0
Restructuring Reserve, Translation Adjustment						0
Accrued Balance at end of period		0		0		8
2015 Initiatives [Member] | Other Non-cash Benefit Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	[4]	0		0		7
2015 Initiatives [Member] | Other Cost Savings Implementation Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	[5]	39		47		22
2015 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost		$ 12		$ 0		$ 0

[1] Includes $17 of severance pay and benefits recorded in Other liabilities in the Consolidated Balance Sheet.

[2] Includes $45 of severance pay and benefits recorded in Other liabilities in the Consolidated Balance Sheet.

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

[4] Represents postretirement and pension curtailment costs. See Note 10.

[5] 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.