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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | May 31, 2021 | May 31, 2020
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Components Of Deferred Tax Assets And Liabilities [Abstract] |  |
Property, equipment, leases and intangibles | $ 4,248 | $ 3,819
Employee benefits | 1,178 | 1,448
Self-insurance accruals | 799 | 647
Other | 497 | 579
Net operating loss/credit carryforwards | 934 | 1,262
Valuation allowances | (382) | (450)
Deferred Tax Assets, Net | 7,274 | 7,305
Property, equipment, leases and intangibles | 9,731 | 8,745
Other | 52 | 375
Deferred Tax Liabilities | $ 9,783 | $ 9,120

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