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Short-term Borrowings and Long-term Debt (Schedule of Long-Term Debt) (Details) - USD ($)
$ in Millions
Jan. 31, 2018
Jan. 31, 2017
Debt Instrument [Line Items]    
Long-term debt $ 33,783 $ 38,271
Less amounts due within one year (3,738) (2,256)
Long-term debt 30,045 36,015
Fixed    
Debt Instrument [Line Items]    
Long-term debt $ 24,540 $ 30,500
Debt weighted average interest rate fixed 3.90% 4.70%
Variable    
Debt Instrument [Line Items]    
Long-term debt $ 800 $ 500
Debt weighted average interest rate variable 4.10% 5.50%
Total U.S. dollar denominated    
Debt Instrument [Line Items]    
Long-term debt $ 25,340 $ 31,000
Fixed    
Debt Instrument [Line Items]    
Long-term debt $ 3,101 $ 2,674
Debt weighted average interest rate fixed 3.30% 3.30%
Variable    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 0
Total Euro denominated    
Debt Instrument [Line Items]    
Long-term debt 3,101 2,674
Fixed    
Debt Instrument [Line Items]    
Long-term debt $ 3,801 $ 4,370
Debt weighted average interest rate fixed 5.40% 5.30%
Variable    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 0
Total Sterling denominated    
Debt Instrument [Line Items]    
Long-term debt 3,801 4,370
Fixed    
Debt Instrument [Line Items]    
Long-term debt $ 1,655 $ 88
Debt weighted average interest rate fixed 0.40% 1.60%
Variable    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 0
Total Yen denominated    
Debt Instrument [Line Items]    
Long-term debt 1,655 88
Unsecured debt    
Debt Instrument [Line Items]    
Long-term debt 33,897 38,132
Total other debt    
Debt Instrument [Line Items]    
Deferred loan costs, discounts, fair value hedges, foreign-held debt and secured debt $ (114) $ 139