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Short-term Borrowings and Long-term Debt Short-term Borrowings and Long-term Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Oct. 28, 2012
Aug. 06, 2012
Aug. 02, 2012
Business Acquisition, Cost of Acquired Entity, Purchase Price   $ 1,550  
BusinessAcquisitionCostOfAcquiredEntityPurchasePriceAdjustments 20    
Commercial Paper     326
Floating Rate Notes [Member]
     
Debt Instrument, Face Amount     400
Debt Instrument, Maturity Date Aug. 01, 2014    
Debt Instrument, Description of Variable Rate Basis LIBOR    
Debt Instrument, Interest Rate, Basis for Effective Rate .003    
Two Point Five Percent Notes [Member]
     
Debt Instrument, Face Amount     450
Debt Instrument, Maturity Date Aug. 02, 2022    
Debt Instrument, Interest Rate, Stated Percentage     2.50%
Three Point Eight Percent Notes [Member]
     
Debt Instrument, Face Amount     $ 400
Debt Instrument, Maturity Date Aug. 02, 2042    
Debt Instrument, Interest Rate, Stated Percentage     3.80%