Short-Term Borrowings And Long-Term Debt (Schedule Of Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 29, 2012		Jul. 31, 2011
Other	$ 8	[1]	$ 27	[1]
Total	2,408		2,427
Less current portion	404		0
Total long-term debt	2,004		2,427
5.00% Notes [Member]
Fiscal Year of Maturity	2013
Stated interest rate	5.00%
Face amount	400		400
4.88% Notes [Member]
Fiscal Year of Maturity	2014
Stated interest rate	4.88%
Face amount	300		300
3.38% Notes [Member]
Fiscal Year of Maturity	2015
Stated interest rate	3.38%
Face amount	300		300
3.05% Notes [Member]
Fiscal Year of Maturity	2017
Stated interest rate	3.05%
Face amount	400		400
4.50% Notes [Member]
Fiscal Year of Maturity	2019
Stated interest rate	4.50%
Face amount	300		300
4.25% Notes [Member]
Fiscal Year of Maturity	2021
Stated interest rate	4.25%
Face amount	500		500
8.88% Debentures [Member]
Fiscal Year of Maturity	2021
Stated interest rate	8.88%
Face amount	$ 200		$ 200

[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 12.