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Short-term Borrowings and Long-term Debt (Schedule of Debt Maturities) (Details) - USD ($)
$ in Millions
Jan. 31, 2023
Jan. 31, 2022
Debt Instrument [Line Items]    
2024 $ 4,191 $ 2,803
Total debt 38,840 $ 37,667
Unsecured debt    
Debt Instrument [Line Items]    
2024 4,191  
2025 3,516  
2026 2,604  
2027 2,737  
2028 1,817  
Thereafter 23,975  
Total debt $ 38,840