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Short-term Borrowing and Long-term Debt (Narratives) (Details)
CAD in Millions, $ in Millions
12 Months Ended
Jul. 31, 2016
USD ($)
Oct. 30, 2016
USD ($)
Oct. 30, 2016
CAD
Jul. 31, 2016
CAD
Aug. 02, 2015
USD ($)
Debt Instrument [Line Items]          
Short-term borrowings $ 1,219       $ 1,543
Commercial Paper 770       1,532
Letters of Credit Outstanding, Amount 47        
Long-term Debt 2,755       $ 2,539
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 444        
Long-term Debt, Maturities, Repayments of Principal in Year Two 32        
Long-term Debt, Maturities, Repayments of Principal in Year Three 442        
Long-term Debt, Maturities, Repayments of Principal in Year Four 1        
Long-term Debt, Maturities, Repayments of Principal in Year Five 700        
Long-term Debt, Maturities, Repayments of Principal after Year Five $ 1,156        
Commercial Paper [Member]          
Debt Instrument [Line Items]          
Short-term Debt, Weighted Average Interest Rate 0.74%     0.74% 0.58%
3.30% notes, due 2025          
Debt Instrument [Line Items]          
Debt Instrument, Interest Rate, Stated Percentage 3.30%     3.30% 3.30%
Long-term Debt $ 300       $ 300
Debt Instrument, Maturity Date Mar. 19, 2025        
Domestic Line of Credit [Member]          
Debt Instrument [Line Items]          
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        
Foreign Line of Credit [Member]          
Debt Instrument [Line Items]          
Line of Credit Facility, Maximum Borrowing Capacity $ 215     CAD 280  
Line of Credit Facility, Maximum Borrowing Capacity in One Year | CAD       225  
Line of Credit Facility, Maximum Borrowing Capacity in Two Years | CAD       CAD 185  
Line of Credit Facility, Interest Rate at Period End 1.78%     1.78%  
Foreign Line of Credit [Member] | Variable Interest Rate [Member]          
Debt Instrument [Line Items]          
Long-term Line of Credit $ 215     CAD 280 0
Line of Credit, Current $ 42     CAD 55 $ 0
Debt Instrument, Maturity Date Jul. 15, 2019        
Scenario, Forecast [Member] | Foreign Line of Credit [Member] | Variable Interest Rate [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Annual Principal Payment   $ 27 CAD 35