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Taxes (Tables) | 12 Months Ended
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Jan. 31, 2018
Income Tax Disclosure [Abstract] |
Schedule of income before income taxes | The components of income before income taxes are as follows:
| Fiscal Years Ended January 31,
(Amounts in millions) | 2018 |  | 2017 |  | 2016
U.S. | $ | 10,722 |  |  | $ | 15,680 |  |  | $ | 16,685 |
Non-U.S. | 4,401 |  |  | 4,817 |  |  | 4,953 |
Total income before income taxes | $ | 15,123 |  |  | $ | 20,497 |  |  | $ | 21,638 |
Schedule of income tax provision | A summary of the provision for income taxes is as follows:
| Fiscal Years Ended January 31,
(Amounts in millions) | 2018 |  | 2017 |  | 2016
Current: |  |  |  |  |
U.S. federal | $ | 2,998 |  |  | $ | 3,454 |  |  | $ | 5,562 |
U.S. state and local | 405 |  |  | 495 |  |  | 622 |
International | 1,377 |  |  | 1,510 |  |  | 1,400 |
Total current tax provision | 4,780 |  |  | 5,459 |  |  | 7,584 |
Deferred: |  |  |  |  |
U.S. federal | (22 | ) |  | 1,054 |  |  | (704 | )
U.S. state and local | (12 | ) |  | 51 |  |  | (106 | )
International | (146 | ) |  | (360 | ) |  | (216 | )
Total deferred tax expense (benefit) | (180 | ) |  | 745 |  |  | (1,026 | )
Total provision for income taxes | $ | 4,600 |  |  | $ | 6,204 |  |  | $ | 6,558 |
Schedule of income tax rate | A reconciliation of the significant differences between the U.S. statutory tax rate and the effective income tax rate on pretax income from continuing operations is as follows:
| Fiscal Years Ended January 31,
| 2018 |  | 2017 |  | 2016
U.S. statutory tax rate | 33.8 | % |  | 35.0 | % |  | 35.0 | %
U.S. state income taxes, net of federal income tax benefit | 1.8 | % |  | 1.7 | % |  | 1.8 | %
Impact of the Tax Act: |  |  |  |  |
One-time transition tax | 12.3 | % |  | — | % |  | — | %
Deferred tax effects | (14.1 | )% |  | — | % |  | — | %
Income taxed outside the U.S. | (4.1 | )% |  | (4.5 | )% |  | (4.0 | )%
Net impact of repatriated international earnings | (0.1 | )% |  | (1.0 | )% |  | 0.1 | %
Other, net | 0.8 | % |  | (0.9 | )% |  | (2.6 | )%
Effective income tax rate | 30.4 | % |  | 30.3 | % |  | 30.3 | %
Schedule of deferred tax balances | The significant components of the Company's deferred tax account balances are as follows:
|  | January 31,
(Amounts in millions) |  | 2018 |  | 2017
Deferred tax assets: |  |  |  |
Loss and tax credit carryforwards |  | $ | 1,989 |  |  | $ | 3,633 |
Accrued liabilities |  | 2,482 |  |  | 3,437 |
Share-based compensation |  | 217 |  |  | 309 |
Other |  | 1,251 |  |  | 1,474 |
Total deferred tax assets |  | 5,939 |  |  | 8,853 |
Valuation allowances |  | (1,843 | ) |  | (1,494 | )
Deferred tax assets, net of valuation allowance |  | 4,096 |  |  | 7,359 |
Deferred tax liabilities: |  |  |  |
Property and equipment |  | 3,954 |  |  | 6,435 |
Inventories |  | 1,153 |  |  | 1,808 |
Other |  | 941 |  |  | 1,884 |
Total deferred tax liabilities |  | 6,048 |  |  | 10,127 |
Net deferred tax liabilities |  | $ | 1,952 |  |  | $ | 2,768 |
Schedule of deferred tax classification in the balance sheet | The deferred taxes noted above are classified as follows in the Company's Consolidated Balance Sheets:
|  | January 31,
(Amounts in millions) |  | 2018 |  | 2017
Balance Sheet classification |  |  |  |
Assets: |  |  |  |
Other assets and deferred charges |  | $ | 1,879 |  |  | $ | 1,565 |
Liabilities: |  |  |  |
Deferred income taxes and other |  | 3,831 |  |  | 4,333 |
Net deferred tax liabilities |  | $ | 1,952 |  |  | $ | 2,768 |
Reconciliation of unrecognized tax benefits from continuing operations | A reconciliation of unrecognized tax benefits from continuing operations is as follows:
| Fiscal Years Ended January 31,
(Amounts in millions) | 2018 |  | 2017 |  | 2016
Unrecognized tax benefits, beginning of year | $ | 1,050 |  |  | $ | 607 |  |  | $ | 838 |
Increases related to prior year tax positions | 130 |  |  | 388 |  |  | 164 |
Decreases related to prior year tax positions | (254 | ) |  | (32 | ) |  | (446 | )
Increases related to current year tax positions | 122 |  |  | 145 |  |  | 119 |
Settlements during the period | (23 | ) |  | (46 | ) |  | (25 | )
Lapse in statutes of limitations | (15 | ) |  | (12 | ) |  | (43 | )
Unrecognized tax benefits, end of year | $ | 1,010 |  |  | $ | 1,050 |  |  | $ | 607 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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