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Income Taxes - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Aug. 31, 2018 | May 31, 2018 | Aug. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Effective tax rate | 24.20% |  | 39.30%
Income tax benefit related to lower statutory Income tax rate on earnings | $ 135 |  |
Recognition of benefit from TCJA |  | $ 225 |
Tax Cuts And Jobs Act Of 2017,Recognition of Benefit per diluted share |  | $ 0.94 |

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