Short-Term Borrowings And Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $)	0 Months Ended	12 Months Ended
	Jan. 31, 2009	Jul. 31, 2011		Aug. 01, 2010
Fixed-rate borrowings		$ 1,000,000		$ 1,000,000
Capital leases				1,000,000
Other		27,000,000	[1]	43,000,000	[1]
Total		2,427,000,000		2,645,000,000
Less current portion				700,000,000
Total long-term debt		2,427,000,000		1,945,000,000
6.75% Notes [Member]
Fiscal Year of Maturity				2011
Rate				6.75%
Notes				700,000,000
5.00% Notes [Member]
Fiscal Year of Maturity		2013		2013
Rate		5.00%		5.00%
Notes		400,000,000		400,000,000
4.88% Notes [Member]
Fiscal Year of Maturity		2014		2014
Rate		4.88%		4.88%
Notes		300,000,000		300,000,000
3.38% Notes [Member]
Fiscal Year of Maturity		2015		2015
Rate		3.38%		3.38%
Notes		300,000,000		300,000,000
3.05% Notes [Member]
Fiscal Year of Maturity		2017		2017
Rate		3.05%		3.05%
Notes		400,000,000		400,000,000
4.50% Notes [Member]
Fiscal Year of Maturity	2019	2019		2019
Rate	4.50%	4.50%		4.50%
Notes	300,000,000	300,000,000		300,000,000
4.25% Notes [Member]
Fiscal Year of Maturity		2021
Rate		4.25%
Notes		500,000,000
8.88% Debentures [Member]
Fiscal Year of Maturity		2021		2021
Rate		8.88%		8.88%
Debentures		$ 200,000,000		$ 200,000,000

[1] Other includes unamortized net premium/discount on debt issuances and amounts related to interest rate swaps designated as fair-value hedges. For additional information on fair-value interest rate swaps, see Note 14.