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Short-Term Borrowings And Long-Term Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
Jul. 29, 2012
Jul. 29, 2012
Revolving Credit Facility Maturing September 2012 [Member]
Sep. 05, 2012
Revolving Credit Facility Maturing September 2016 [Member]
Jul. 29, 2012
Revolving Credit Facility Maturing September 2016 [Member]
Jul. 29, 2012
Commercial Paper [Member]
Jul. 31, 2011
Commercial Paper [Member]
Weighted-average interest rate         0.23% 0.33%
Standby letters of credit issued $ 47          
Revolving credit facility   500 500 1,500    
Line of Credit, Current 3          
Principal amounts of debt maturing 2013 400          
Principal amounts of debt maturing 2014 300          
Principal amounts of debt maturing 2015 300          
Principal amounts of debt maturing 2016 0          
Principal amounts of debt maturing 2017 400          
Principal amounts of debt maturing beyond 2017 $ 1,000