v3.20.4
Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
 12 Months Ended
Jan. 31, 2021
Jan. 26, 2020
Debt Instrument [Line Items]    
Unamortized debt discount and issuance costs $ (37) $ (9)
Net carrying amount 6,963 1,991
Less short-term portion (999) 0
Long-term debt $ 5,964 1,991
2.20% Notes Due 2021    
Debt Instrument [Line Items]    
Interest rate (as percent) 2.20%  
Expected Remaining Term (years) 7 months 6 days  
Effective Interest Rate (as percent) 2.38%  
Gross carrying amount $ 1,000 1,000
3.20% Notes Due 2026    
Debt Instrument [Line Items]    
Interest rate (as percent) 3.20%  
Expected Remaining Term (years) 5 years 7 months 6 days  
Effective Interest Rate (as percent) 3.31%  
Gross carrying amount $ 1,000 1,000
2.85% Notes Due 2030    
Debt Instrument [Line Items]    
Interest rate (as percent) 2.85%  
Expected Remaining Term (years) 9 years 2 months 12 days  
Effective Interest Rate (as percent) 2.93%  
Gross carrying amount $ 1,500 0
3.50% Notes Due 2040    
Debt Instrument [Line Items]    
Interest rate (as percent) 3.50%  
Expected Remaining Term (years) 19 years 2 months 12 days  
Effective Interest Rate (as percent) 3.54%  
Gross carrying amount $ 1,000 0
3.50% Notes Due 2050    
Debt Instrument [Line Items]    
Interest rate (as percent) 3.50%  
Expected Remaining Term (years) 29 years 2 months 12 days  
Effective Interest Rate (as percent) 3.54%  
Gross carrying amount $ 2,000 0
3.70% Notes Due 2060    
Debt Instrument [Line Items]    
Interest rate (as percent) 3.70%  
Expected Remaining Term (years) 39 years 2 months 12 days  
Effective Interest Rate (as percent) 3.73%  
Gross carrying amount $ 500 $ 0