Restructuring Charges and Cost Savings Initiatives (Schedule Of Restructuring Activity And Related Reserves) (Details) - USD ($) $ in Millions		12 Months Ended
		Jul. 31, 2016		Aug. 02, 2015		Aug. 03, 2014
Restructuring Reserve [Roll Forward]
Restructuring Charges		$ 31		$ 102		$ 55
Restructuring Reserve, Noncurrent		17		49
2015 Initiatives [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost		82		124
Restructuring Charges		35		102
2015 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period		85	[1]	0
Restructuring and Related Cost, Incurred Cost		34		87
Cash Payments		(46)		(1)
Restructuring Reserve, Translation Adjustment				(1)
Accrued Balance at end of period		73	[2]	85	[1]	0
Restructuring Reserve, Noncurrent		17		45
2015 Initiatives [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period		8		0
Restructuring and Related Cost, Incurred Cost		1		8
Cash Payments		(9)		0
Restructuring Reserve, Translation Adjustment				0
Accrued Balance at end of period		0		8		0
2015 Initiatives [Member] | Other Non-cash Benefit Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	[3]	0		7
2014 Initiatives [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost		(4)
Restructuring Charges		(4)				54
2014 Initiatives [Member] | Severance Pay And Benefits [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period		10	[4]	28		0
Restructuring Charges		(4)				41
Cash Payments		(4)		(16)		(13)
Restructuring Reserve, Translation Adjustment		(1)		(2)
Accrued Balance at end of period		1		10	[4]	28
Restructuring Reserve, Noncurrent				4
2014 Initiatives [Member] | Asset Impairment Accelerated Depreciation [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges		0				12
2014 Initiatives [Member] | Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	[5]	0				1
2013 Initiatives [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges						$ 1
General and Administrative Expense [Member] | 2015 Initiatives [Member] | Other Cost Savings Implementation Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and Related Cost, Incurred Cost	[6]	$ 47		$ 22

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

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

[3] Represents postretirement and pension curtailment costs. See Note 11.

[4] Includes $4 of severance pay and benefits recorded in Other liabilities in the Consolidated Balance Sheet.

[5] Includes non-cash costs that are not reflected in the restructuring reserve in the Consolidated Balance Sheet.

[6] 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 in the Consolidated Statements of Earnings.