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Taxes (Schedule of Income Tax Provision) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017 | Jan. 31, 2016
Taxes [Abstract] |  |  |
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
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

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