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Short-term Borrowings and Long-term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
Jan. 31, 2021
Jan. 31, 2020
Debt Instrument [Line Items]    
Unsecured debt $ 44,306 $ 49,180
Total debt 44,309 49,076
Less amounts due within one year (3,115) (5,362)
Long-term debt 41,194 43,714
Unsecured debt [Member]    
Debt Instrument [Line Items]    
Total debt 44,309  
Less amounts due within one year (3,115)  
Total other debt [Member]    
Debt Instrument [Line Items]    
Total other 3 (104)
Denominated US Dollar with Fixed Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 35,216 $ 39,752
Denominated US Dollar with Fixed Rate [Member] | Unsecured debt [Member]    
Debt Instrument [Line Items]    
Average Rate 3.90% 3.80%
Denominated US Dollar with Variable Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 750 $ 1,500
Denominated US Dollar with Variable Rate [Member] | Unsecured debt [Member]    
Debt Instrument [Line Items]    
Average Rate 0.50% 2.10%
Denominated U S Dollar [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 35,966 $ 41,252
Denominated Euro with Fixed Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 3,034 $ 2,758
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 3,034 2,758
Denominated Sterling with Fixed Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 3,682 $ 3,518
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 3,682 3,518
Denominated Yen with Fixed Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 1,624 $ 1,652
Denominated Yen with Fixed Rate [Member] | Unsecured debt [Member]    
Debt Instrument [Line Items]    
Average Rate 0.30% 0.40%
Denominated Yen with Variable Rate [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 0 $ 0
Denominated Yen [Member]    
Debt Instrument [Line Items]    
Unsecured debt $ 1,624 $ 1,652