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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. 31, 2022
Aug. 01, 2021
Aug. 02, 2020
Debt Instrument [Line Items]      
Finance Lease, Liability, Noncurrent $ 16 $ 19  
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [1] 1 0  
Long Term Debt And Finance Lease Obligations Aggregate 4,561 5,010  
Long-term Debt, Current Maturities 565 0  
Long-term Debt and Lease Obligation $ 3,996 $ 5,010  
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Long-term Debt and Lease Obligation Long-term Debt and Lease Obligation  
2.50% notes, due 2023      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.50%    
Debt Instrument, Maturity Date Aug. 02, 2022    
Long-term Debt, Gross $ 0 $ 450  
3.65% notes, due 2023      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.65%   3.65%
Debt Instrument, Maturity Date Mar. 15, 2023    
Long-term Debt, Gross $ 566 566  
3.95% notes, due 2025      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.95%    
Debt Instrument, Maturity Date Mar. 15, 2025    
Long-term Debt, Gross $ 850 850  
3.30% notes, due 2025      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.30%    
Debt Instrument, Maturity Date Mar. 19, 2025    
Long-term Debt, Gross $ 300 300  
4.15% notes, due 2028      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.15%    
Debt Instrument, Maturity Date Mar. 15, 2028    
Long-term Debt, Gross $ 1,000 1,000  
2.375% notes, due 2030      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 2.375%   2.375%
Debt Instrument, Maturity Date Apr. 24, 2030    
Long-term Debt, Gross $ 500 500  
3.80% notes, due 2043      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.80%   3.80%
Debt Instrument, Maturity Date Aug. 02, 2042    
Long-term Debt, Gross $ 163 163  
4.80% notes, due 2048      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.80%    
Debt Instrument, Maturity Date Mar. 15, 2048    
Long-term Debt, Gross $ 700 700  
3.125% notes, due 2050      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 3.125%   3.125%
Debt Instrument, Maturity Date Apr. 24, 2050    
Long-term Debt, Gross $ 500 500  
Long-term Debt [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net [2] $ 34 $ 38  
[1] Includes unamortized net discount/premium on debt issuances and debt issuance costs.
[2] Includes unamortized net discount/premium on debt issuances and debt issuance costs