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Fair Value Measurements (Tables) | 9 Months Ended
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Oct. 31, 2015
Fair Value Disclosures [Abstract] |
Financial Assets And Liabilities Measured At Fair Value On Recurring Basis | Financial assets and liabilities measured at fair value on a recurring basis and cash equivalents are as follows:
|  |  | Fair Value Measurements at Reporting Date Using
($ in millions) | October 31, 2015 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash equivalents | $ | 174 |  |  | $ | 62 |  |  | $ | 112 |  |  | $ | — |
Derivative financial instruments | 84 |  |  | — |  |  | 84 |  |  | — |
Deferred compensation plan assets | 41 |  |  | 41 |  |  | — |  |  | — |
Total | $ | 299 |  |  | $ | 103 |  |  | $ | 196 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Derivative financial instruments | $ | 8 |  |  | $ | — |  |  | $ | 8 |  |  | $ | — |
|  |  | Fair Value Measurements at Reporting Date Using
($ in millions) | January 31, 2015 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash equivalents | $ | 429 |  |  | $ | 88 |  |  | $ | 341 |  |  | $ | — |
Derivative financial instruments | 157 |  |  | — |  |  | 157 |  |  | — |
Deferred compensation plan assets | 40 |  |  | 40 |  |  | — |  |  | — |
Total | $ | 626 |  |  | $ | 128 |  |  | $ | 498 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Derivative financial instruments | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |
|  |  | Fair Value Measurements at Reporting Date Using
($ in millions) | November 1, 2014 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets: |  |  |  |  |  |  |
Cash equivalents | $ | 241 |  |  | $ | 29 |  |  | $ | 212 |  |  | $ | — |
Derivative financial instruments | 98 |  |  | — |  |  | 98 |  |  | — |
Deferred compensation plan assets | 40 |  |  | 40 |  |  | — |  |  | — |
Total | $ | 379 |  |  | $ | 69 |  |  | $ | 310 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |
Derivative financial instruments | $ | 2 |  |  | $ | — |  |  | $ | 2 |  |  | $ | — |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6447952&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 + Details
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