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Taxes (Schedule of Deferred Tax Classification in the Balance Sheet) (Details) - USD ($) $ in Millions | Jan. 31, 2018 | Jan. 31, 2017
--- | --- | ---
Liabilities [Abstract] |  |
Net deferred tax liabilities | $ 1,952 | $ 2,768
Other assets and deferred charges |  |
Assets |  |
Other assets and deferred charges | 1,879 | 1,565
Deferred income taxes and other |  |
Liabilities [Abstract] |  |
Deferred income taxes and other | $ 3,831 | $ 4,333

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