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Taxes (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016 | Jan. 31, 2015
Taxes [Line Items] |  |  |  |
Federal statutory income tax rate, pre-Tax Cuts and Jobs Act | 35.00% |  |  |
Federal statutory income tax rate, post-Tax Cuts and Jobs Act | 21.00% |  |  |
U.S. statutory tax rate | 33.80% | 35.00% | 35.00% |
Net tax benefit recognized | $ 200 |  |  |
Transition tax on accumulated foreign earnings, for cash and other net current assets | 15.50% |  |  |
Transition tax on accumulated foreign earnings, remaining earnings | 8.00% |  |  |
Provisional transition tax for accumulated foreign earnings | $ 1,900 |  |  |
Provisional deferred tax benefit from change in tax rate | 2,100 |  |  |
Amount tax basis exceeds outside book basis of foreign subsidiaries | 10,000 |  |  |
Operating loss and capital loss carryforwards expiring by 2038 | 3,600 |  |  |
Valuation allowances | (1,843) | $ (1,494) |  |
Unrecognized tax benefits | 1,010 | 1,050 | $ 607 | $ 838
Unrecognized tax benefits that would impact effective tax rate | 690 | 703 |  |
Interest and penalty expense (benefit) related to uncertain tax positions | 32 | 35 | $ 5 |
Unrecognized tax benefits, interest on income taxes accrued | 96 | 72 |  |
Unrecognized tax benefits, income tax penalties accrued | 12 | $ 0 |  |
Minimum |  |  |  |
Taxes [Line Items] |  |  |  |
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit | 50 |  |  |
Maximum |  |  |  |
Taxes [Line Items] |  |  |  |
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit | 400 |  |  |
Operating and capital loss carryforward [Member] |  |  |  |
Taxes [Line Items] |  |  |  |
Operating loss and capital loss carryforwards | $ 6,700 |  |  |

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