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Derivative Financial Instruments (Tables) | 12 Months Ended
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Jan. 31, 2018
Summary of Derivative Instruments [Abstract] |
Balance Sheet Classification Of Financial Instruments | The Company's derivative instruments, as well as its nonderivative debt instruments designated and qualifying as net investment hedges, were classified as follows as of January 31, 2018 and 2017 in the Company's Consolidated Balance Sheets:
| January 31, 2018 |  | January 31, 2017
(Amounts in millions) | Fair Value Instruments |  | Net Investment Instruments |  | Cash Flow Instruments |  | Fair Value Instruments |  | Net Investment Instruments |  | Cash Flow Instruments
Derivative instruments |  |  |  |  |  |  |  |  |  |  |
Derivative assets: |  |  |  |  |  |  |  |  |  |  |
Other assets and deferred charges | $ | — |  |  | $ | 208 |  |  | $ | 300 |  |  | $ | 8 |  |  | $ | 471 |  |  | $ | — |
Derivative liabilities: |  |  |  |  |  |  |  |  |  |  |
Deferred income taxes and other | 91 |  |  | — |  |  | 95 |  |  | 12 |  |  | — |  |  | 618 |
Nonderivative hedging instruments |  |  |  |  |  |  |  |  |  |  |
Long-term debt | — |  |  | 4,041 |  |  | — |  |  | — |  |  | 3,209 |  |  | — |

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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