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Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt Instruments) (Details)
$ in Millions, $ in Millions
12 Months Ended
Jul. 29, 2018
USD ($)
Apr. 29, 2018
USD ($)
Jul. 30, 2017
USD ($)
Jul. 30, 2017
AUD ($)
Debt Instrument [Line Items]        
Long-term Debt, Gross   $ 5,300    
Capital Lease Obligations, Noncurrent $ 7   $ 7  
Long Term Debt And Capital Lease Obligations Aggregate 8,595   2,499  
Long-term Debt, Current Maturities 597   0  
Long-term Debt and Capital Lease Obligations $ 7,998   2,499  
Variable Interest Rate due 2019 | 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 $ 90   130  
4.88% notes, due 2019        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Sep. 18, 2018      
Debt Instrument, Interest Rate, Stated Percentage 4.88%      
Long-term Debt, Gross $ 207   224 $ 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%      
Long-term Debt, Gross $ 300   300  
Variable Interest Rate due 2020 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Mar. 16, 2020      
Debt Instrument, Description of Variable Rate Basis Variable      
Long-term Debt, Gross $ 500   0  
Variable Interest Rate due 2021 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Mar. 15, 2021      
Debt Instrument, Description of Variable Rate Basis Variable      
Long-term Debt, Gross $ 400   0  
Variable Interest Rate Term Loan due 2021 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Mar. 26, 2021      
Debt Instrument, Description of Variable Rate Basis Variable      
Long-term Debt, Gross $ 900 $ 900 0  
3.30% notes, due 2021        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Mar. 15, 2021      
Debt Instrument, Interest Rate, Stated Percentage 3.30%      
Long-term Debt, Gross $ 650   0  
4.25% notes, due 2021        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Apr. 15, 2021      
Debt Instrument, Interest Rate, Stated Percentage 4.25%      
Long-term Debt, Gross $ 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%      
Long-term Debt, Gross $ 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%      
Long-term Debt, Gross $ 450   450  
3.65% notes, due 2023        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Mar. 15, 2023      
Debt Instrument, Interest Rate, Stated Percentage 3.65%      
Long-term Debt, Gross $ 1,200   0  
3.95% notes, due 2025        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Mar. 15, 2025      
Debt Instrument, Interest Rate, Stated Percentage 3.95%      
Long-term Debt, Gross $ 850   0  
3.30% notes, due 2025        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Mar. 19, 2025      
Debt Instrument, Interest Rate, Stated Percentage 3.30%      
Long-term Debt, Gross $ 300   300  
4.15% notes, due 2028        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Mar. 15, 2028      
Debt Instrument, Interest Rate, Stated Percentage 4.15%      
Long-term Debt, Gross $ 1,000   0  
3.80% notes, due 2043        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Aug. 02, 2042      
Debt Instrument, Interest Rate, Stated Percentage 3.80%      
Long-term Debt, Gross $ 400   400  
4.80% notes, due 2048        
Debt Instrument [Line Items]        
Debt Instrument, Maturity Date Mar. 15, 2048      
Debt Instrument, Interest Rate, Stated Percentage 4.80%      
Long-term Debt, Gross $ 700   0  
Long-term Debt [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [1] $ (59)   $ (12)  
[1] Includes unamortized net discount/premium on debt issuances and debt issuance costs