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Short-term Borrowings and Long-term Debt (Schedule of Debt Maturities) (Details) - USD ($)
$ in Millions
Jan. 31, 2021
Jan. 31, 2020
Debt Instrument [Line Items]    
2022 $ 3,115 $ 5,362
Total debt 44,309 $ 49,076
Unsecured debt [Member]    
Debt Instrument [Line Items]    
2022 3,115  
2023 3,014  
2024 4,721  
2025 4,360  
2026 1,480  
Thereafter 27,619  
Total debt $ 44,309