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Income Taxes - Schedule of Reconciliation of Total Income Tax Expense and Amount Computed by Statutory Federal Income Tax Rate to Income Before Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2023 | May 31, 2022 | May 31, 2021
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Taxes computed at federal statutory rate | $ 1,126 | $ 1,028 | $ 1,401
U.S. and foreign return-to-provision adjustments | (44) | (142) |
State and local income taxes, net of federal benefit | 152 | 116 | 179
Foreign operations | 96 | 115 | 138
Non-deductible expenses | 40 | 48 | 53
Uncertain tax positions | 60 | (18) | 65
Benefits from share-based payments | (18) | (13) | (69)
Valuation allowance | 59 | 33 | 14
Foreign tax rate enactments | 3 | (30) | (61)
Benefit from U.S. tax loss carryback to prior years | 0 | 0 | (279)
Goodwill impairment charges | 8 |  |
Other, net | (91) | (67) | 2
Provision for Income Taxes, Total | $ 1,391 | $ 1,070 | $ 1,443
Effective Tax Rate | 25.90% | 21.90% | 21.60%

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