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INCOME TAXES - Components of Deferred Tax Liabilities and Assets Continued (Details) - USD ($) $ in Millions | May 31, 2019 | May 31, 2018
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Components of Deferred Tax Assets and Liabilities [Abstract] |  |
Non-current deferred tax assets | $ 2,696 | $ 1,395
Non-current deferred tax liabilities (in other non-current liabilities) | (264) | (58)
Net deferred tax assets | $ 2,432 | $ 1,337

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