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Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2018 | May 31, 2017 | May 31, 2016
Current: |  |  |
Federal | $ 1,167 | $ 398 | $ 304
State | 45 | 82 | 71
Foreign | 533 | 439 | 568
Total | 1,745 | 919 | 943
Deferred: |  |  |
Federal | 595 | (279) | (57)
State | 25 | (9) | (16)
Foreign | 27 | 15 | (7)
Total | 647 | (273) | (80)
Income tax expense | $ 2,392 | $ 646 | $ 863

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