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Short-term Borrowings and Long-term Debt Short-term Borrowing and Long-term Debt (Narratives) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 02, 2015
Aug. 03, 2014
Debt Instrument [Line Items]    
Short-term borrowings $ 1,543 $ 1,771
Commercial Paper 1,532 1,406
Letters of Credit Outstanding, Amount 50  
Line of Credit Facility, Maximum Borrowing Capacity 2,200  
Line of Credit Facility Utilized Borrowing Capacity 3  
Line of Credit Facility, Additional Borrowing Capacity 500  
Long-term Debt 2,552 $ 2,544
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 1  
Long-term Debt, Maturities, Repayments of Principal in Year Two 401  
Long-term Debt, Maturities, Repayments of Principal in Year Three 1  
Long-term Debt, Maturities, Repayments of Principal in Year Four 301  
Long-term Debt, Maturities, Repayments of Principal in Year Five 0  
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 1,857  
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Short-term Debt, Weighted Average Interest Rate 0.58% 0.27%
3.30% notes, due 2025    
Debt Instrument [Line Items]    
Long-term Debt $ 300 $ 0
Debt Instrument, Interest Rate, Stated Percentage 3.30%  
Debt Instrument, Maturity Date Mar. 19, 2025