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Short-term Borrowings and Long-term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
Jan. 31, 2022
Jan. 31, 2021
Debt Instrument [Line Items]    
Unsecured debt $ 37,820 $ 44,306
Total debt 37,667 44,309
Less amounts due within one year (2,803) (3,115)
Long-term debt 34,864 41,194
Unsecured debt [Member]    
Debt Instrument [Line Items]    
Total debt 37,667  
Less amounts due within one year (2,803)  
Total other debt [Member]    
Debt Instrument [Line Items]    
Total other (153) 3
Denominated US Dollar with Fixed Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 29,957 $ 35,216
Denominated US Dollar with Fixed Rate [Member] | Unsecured debt [Member]    
Debt Instrument [Line Items]    
Average Rate 3.50% 3.90%
Denominated US Dollar with Variable Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 0 $ 750
Denominated US Dollar with Variable Rate [Member] | Unsecured debt [Member]    
Debt Instrument [Line Items]    
Average Rate 0.50%
Denominated U S Dollar [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 29,957 $ 35,966
Denominated Euro with Fixed Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 2,787 $ 3,034
Denominated Euro with Fixed Rate [Member] | Unsecured debt [Member]    
Debt Instrument [Line Items]    
Average Rate 3.30% 3.30%
Denominated Euro with Variable Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 0 $ 0
Denominated Euro [Member]    
Debt Instrument [Line Items]    
Unsecured debt 2,787 3,034
Denominated Sterling with Fixed Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 3,601 $ 3,682
Denominated Sterling with Fixed Rate [Member] | Unsecured debt [Member]    
Debt Instrument [Line Items]    
Average Rate 5.40% 5.40%
Denominated Sterling with Variable Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 0 $ 0
Denominated Sterling [Member]    
Debt Instrument [Line Items]    
Unsecured debt 3,601 3,682
Denominated Yen with Fixed Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 1,475 $ 1,624
Denominated Yen with Fixed Rate [Member] | Unsecured debt [Member]    
Debt Instrument [Line Items]    
Average Rate 0.30% 0.30%
Denominated Yen with Variable Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 0 $ 0
Denominated Yen [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 1,475 $ 1,624