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Income Taxes - Schedule of Net Deferred Tax Liabilities (Details) - USD ($) $ in Millions | May 31, 2021 | May 31, 2020
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Deferred Tax Assets Liabilities Net [Abstract] |  |  |
Noncurrent deferred tax assets | [1] | $ 1,418 | $ 1,347
Noncurrent deferred tax liabilities |  | (3,927) | (3,162)
Net deferred tax liabilities |  | $ (2,509) | $ (1,815)
[1] | Noncurrent deferred tax assets are included in the line item “Other Assets” in our accompanying consolidated balance sheets.

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