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Short-term Borrowings and Long-term Debt (Schedule of Debt Maturities) (Details) - USD ($)
$ in Millions
Jan. 31, 2022
Jan. 31, 2021
Debt Instrument [Line Items]    
2023 $ 2,803 $ 3,115
Total debt 37,667 $ 44,309
Unsecured debt [Member]    
Debt Instrument [Line Items]    
2023 2,803  
2024 4,224  
2025 3,565  
2026 857  
2027 2,757  
Thereafter 23,461  
Total debt $ 37,667