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Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt Instruments) (Details)
CAD in Millions, $ in Millions
12 Months Ended
Jul. 31, 2016
USD ($)
Aug. 02, 2015
USD ($)
Jul. 31, 2016
CAD
Debt Instrument [Line Items]      
Long-term Debt $ 2,755 $ 2,539  
Capital Lease Obligations, Noncurrent 8 10  
Debt Instrument, Unamortized Discount and Debt Issuance Costs [1] 18 21  
Long Term Debt And Capital Lease Obligations Aggregate 2,755 2,539  
Long-term Debt, Current Maturities [1] 441 0  
Long-term Debt and Capital Lease Obligations $ 2,314 $ 2,539  
3.05% notes, due 2017      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Jul. 15, 2017    
Debt Instrument, Interest Rate, Stated Percentage 3.05% 3.05% 3.05%
Long-term Debt $ 400 $ 400  
4.50% notes, due 2019      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Feb. 15, 2019    
Debt Instrument, Interest Rate, Stated Percentage 4.50% 4.50% 4.50%
Long-term Debt $ 300 $ 300  
4.25% notes, due 2021      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Apr. 15, 2021    
Debt Instrument, Interest Rate, Stated Percentage 4.25% 4.25% 4.25%
Long-term Debt $ 500 $ 500  
8.88% notes, due 2021      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date May 01, 2021    
Debt Instrument, Interest Rate, Stated Percentage 8.88% 8.88% 8.88%
Long-term Debt $ 200 $ 200  
2.50% notes, due 2023      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Aug. 02, 2022    
Debt Instrument, Interest Rate, Stated Percentage 2.50% 2.50% 2.50%
Long-term Debt $ 450 $ 450  
3.30% notes, due 2025      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Mar. 19, 2025    
Debt Instrument, Interest Rate, Stated Percentage 3.30% 3.30% 3.30%
Long-term Debt $ 300 $ 300  
3.80% notes, due 2043      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Aug. 02, 2042    
Debt Instrument, Interest Rate, Stated Percentage 3.80% 3.80% 3.80%
Long-term Debt $ 400 $ 400  
Variable Interest Rate [Member] | Foreign Line of Credit [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Maturity Date Jul. 15, 2019    
Debt Instrument, Description of Variable Rate Basis   Variable  
Long-term Line of Credit $ 215 $ 0 CAD 280
[1] Includes unamortized net discount/premium on debt issuances and debt issuance costs.