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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | May 31, 2020 | May 31, 2019
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Components Of Deferred Tax Assets And Liabilities [Abstract] |  |  |
Property, equipment, leases and intangibles | [1] | $ 3,819 | $ 592
Employee benefits |  | 1,448 | 1,256
Self-insurance accruals |  | 647 | 585
Other |  | 579 | 510
Net operating loss/credit carryforwards |  | 1,262 | 1,139
Valuation allowances |  | (450) | (590)
Deferred Tax Assets, Net |  | 7,305 | 3,492
Property, equipment, leases and intangibles | [1] | 8,745 | 4,633
Other |  | 375 | 340
Deferred Tax Liabilities |  | $ 9,120 | $ 4,973
[1] | Includes impact from adoption of the new lease accounting standard in 2020. See Note 7 for additional information.

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