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Operating Segments and Related Information - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May 31, 2020 | May 31, 2019 | May 31, 2018
Regional Reporting Disclosure [Line Items] |  |  |
Revenues | $ 37,403 | $ 39,117 | $ 36,397
UNITED STATES |  |  |
Regional Reporting Disclosure [Line Items] |  |  |
Revenues | 14,625 | 16,091 | $ 15,314
Long-lived assets attributable to operations (Domestic) | 5,114 | 3,174 |
BELGIUM |  |  |
Regional Reporting Disclosure [Line Items] |  |  |
Long-lived assets attributable to operations (Domestic) | 606 | 618 |
CHINA |  |  |
Regional Reporting Disclosure [Line Items] |  |  |
Long-lived assets attributable to operations (Domestic) | $ 457 | $ 242 |

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