v3.25.1
Short-term Borrowings and Long-term Debt - (Significant Long-term Debt Issued) (Details) - USD ($)
$ in Millions
 3 Months Ended
Apr. 30, 2025
Apr. 30, 2024
Debt Instrument [Line Items]    
Proceeds from issuance of long-term debt $ 3,983 $ 0
Senior Unsecured Notes    
Debt Instrument [Line Items]    
Proceeds from issuance of long-term debt 3,983  
Floating Debt, Due 2027 | Senior Unsecured Notes    
Debt Instrument [Line Items]    
Principal Amount 750  
Proceeds from issuance of long-term debt 749  
4.100% Debt, Due 2027 | Senior Unsecured Notes    
Debt Instrument [Line Items]    
Principal Amount $ 750  
Interest Rate 4.10%  
Proceeds from issuance of long-term debt $ 748  
4.350% Debt, Due 2030 | Senior Unsecured Notes    
Debt Instrument [Line Items]    
Principal Amount $ 1,000  
Interest Rate 4.35%  
Proceeds from issuance of long-term debt $ 993  
4.900% Debt, Due 2035 | Senior Unsecured Notes    
Debt Instrument [Line Items]    
Principal Amount $ 1,500  
Interest Rate 4.90%  
Proceeds from issuance of long-term debt $ 1,493