Restructuring Charges and Cost Savings Initiatives (Schedule Of Restructuring Activity And Related Reserves) (Details) - 2015 Initiatives [Member] - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
		Jan. 31, 2016		Jan. 31, 2016		Aug. 02, 2015
Restructuring Reserve [Roll Forward]
Restructuring charges		$ 19		$ 55
Severance Pay And Benefits [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period	[1]			85
Restructuring charges				32
Cash Payments				(20)
Accrued Balance at end of period		97	[2]	97	[2]	$ 85	[1]
Restructuring Reserve, Noncurrent		43		43		45
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Accrued Balance at beginning of period				8
Restructuring charges				1
Cash Payments				(9)
Accrued Balance at end of period		0		0		8
Other Cost Savings Implementation Costs [Member] | General and Administrative Expense [Member]
Restructuring Reserve [Roll Forward]
Restructuring charges		$ 7		$ 22	[3]	$ 22

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

[2] Includes $43 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 in the Consolidated Statements of Earnings.