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Short-term Borrowings and Long-term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
Jan. 31, 2023
Jan. 31, 2022
Debt Instrument [Line Items]    
Unsecured debt $ 39,582 $ 37,820
Total debt 38,840 37,667
Less amounts due within one year (4,191) (2,803)
Long-term debt 34,649 34,864
Unsecured debt    
Debt Instrument [Line Items]    
Total debt 38,840  
Less amounts due within one year (4,191)  
Total other debt    
Debt Instrument [Line Items]    
Total other (742) (153)
Denominated US Dollar with Fixed Rate    
Debt Instrument [Line Items]    
Unsecured debt $ 33,707 $ 29,957
Denominated US Dollar with Fixed Rate | Unsecured debt    
Debt Instrument [Line Items]    
Average Rate 3.60% 3.50%
Denominated U S Dollar    
Debt Instrument [Line Items]    
Unsecured debt $ 33,707 $ 29,957
Denominated Euro with Fixed Rate    
Debt Instrument [Line Items]    
Unsecured debt $ 1,790 $ 2,787
Denominated Euro with Fixed Rate | Unsecured debt    
Debt Instrument [Line Items]    
Average Rate 4.00% 3.30%
Denominated Euro    
Debt Instrument [Line Items]    
Unsecured debt $ 1,790 $ 2,787
Denominated Sterling with Fixed Rate    
Debt Instrument [Line Items]    
Unsecured debt $ 3,318 $ 3,601
Denominated Sterling with Fixed Rate | Unsecured debt    
Debt Instrument [Line Items]    
Average Rate 5.40% 5.40%
Denominated Sterling    
Debt Instrument [Line Items]    
Unsecured debt $ 3,318 $ 3,601
Denominated Yen with Fixed Rate    
Debt Instrument [Line Items]    
Unsecured debt $ 767 $ 1,475
Denominated Yen with Fixed Rate | Unsecured debt    
Debt Instrument [Line Items]    
Average Rate 0.40% 0.30%
Denominated Yen    
Debt Instrument [Line Items]    
Unsecured debt $ 767 $ 1,475