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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

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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