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Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt Instruments) (Details)
CAD in Millions, AUD in Millions, $ in Millions
12 Months Ended
Jul. 30, 2017
USD ($)
Jul. 31, 2016
USD ($)
Jul. 30, 2017
AUD
Jul. 30, 2017
CAD
Debt Instrument [Line Items]        
Long-term Debt $ 2,499 $ 2,755    
Capital Lease Obligations, Noncurrent 7 8    
Long Term Debt And Capital Lease Obligations Aggregate 2,499 2,755    
Long-term Debt, Current Maturities [1] 0 441    
Long-term Debt and Capital Lease Obligations $ 2,499 $ 2,314    
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% 3.05%
Long-term Debt $ 0 $ 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 $ 130 $ 215   CAD 162
4.88% notes, due 2019        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Sep. 18, 2018      
Debt Instrument, Interest Rate, Stated Percentage 4.88%   4.88% 4.88%
Long-term Debt $ 224 $ 0 AUD 280  
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% 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% 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% 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% 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% 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% 3.80%
Long-term Debt $ 400 $ 400    
Long-term Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [1] $ (12) $ (18)    
[1] Includes unamortized net discount/premium on debt issuances and debt issuance costs