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Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Jan. 31, 2016
Jan. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 40,959 $ 45,680
Long-term Debt, Current Maturities (2,745) (4,791)
Long-term debt 38,214 40,889
Fixed    
Debt Instrument [Line Items]    
Long-term debt $ 32,500 $ 36,000
Debt Weighted Average Interest Rate Fixed 4.50% 4.30%
Variable    
Debt Instrument [Line Items]    
Long-term debt $ 500 $ 500
Debt Weighted Average Interest Rate Variable 5.30% 5.40%
Total U.S. dollar denominated    
Debt Instrument [Line Items]    
Long-term debt $ 33,000 $ 36,500
Fixed    
Debt Instrument [Line Items]    
Long-term debt $ 2,708 $ 2,821
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 2,708 2,821
Fixed    
Debt Instrument [Line Items]    
Long-term debt $ 4,985 $ 5,271
Debt Weighted Average Interest Rate Fixed 5.30% 5.30%
Variable    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 0
Total Sterling denominated    
Debt Instrument [Line Items]    
Long-term debt 4,985 5,271
Fixed    
Debt Instrument [Line Items]    
Long-term debt $ 83 $ 596
Debt Weighted Average Interest Rate Fixed 1.60% 1.00%
Variable    
Debt Instrument [Line Items]    
Long-term debt $ 0 $ 255
Debt Weighted Average Interest Rate Variable 0.60%
Total Yen denominated    
Debt Instrument [Line Items]    
Long-term debt $ 83 $ 851
Total unsecured debt    
Debt Instrument [Line Items]    
Long-term debt 40,776 45,443
Total other debt (in USD)(2)    
Debt Instrument [Line Items]    
Long-term debt $ 183 $ 237