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Taxes (Schedule of Deferred Tax Balances) (Details) - USD ($) $ in Millions | Jan. 31, 2018 | Jan. 31, 2017
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Income Tax Disclosure [Abstract] |  |
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
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

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