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Short-term Borrowings and Long-term Debt (Schedule of Long-term Debt Instruments) (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 28, 2019
Jul. 29, 2018
Apr. 29, 2018
Debt Instrument [Line Items]      
Long-term Debt, Gross     $ 5,300
Capital Lease Obligations, Noncurrent $ 3 $ 0  
Long Term Debt And Capital Lease Obligations Aggregate 7,603 8,381  
Long-term Debt, Current Maturities 500 390  
Long-term Debt and Capital Lease Obligations $ 7,103 7,991  
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 $ 0 90  
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 $ 0 300  
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 $ 500 500  
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 $ 400 400  
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 $ 499 900 $ 900
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 $ 650 650  
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 1,200  
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 $ 850 850  
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 1,000  
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 $ 700 700  
Long-term Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [1] $ 49 $ 59  
[1] Includes unamortized net discount/premium on debt issuances and debt issuance costs