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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, 2021 | May 31, 2020 | May 31, 2019
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract] |  |  |
Taxes computed at federal statutory rate | $ 1,401 | $ 350 | $ 138
Benefit from U.S. tax loss carryback to prior years | (279) | (71) |
State and local income taxes, net of federal benefit | 179 | 53 | 44
Foreign operations | 138 | 38 | (1)
Benefits from share-based payments | (69) | (5) | (18)
Uncertain tax positions | 65 | (14) | 8
Foreign tax rate enactments | (61) | (10) | 50
Non-deductible expenses | 53 | 70 | 79
Valuation allowance | 14 | (129) | (79)
Goodwill impairment charges |  | 75 |
U.S. deferred tax adjustments related to foreign operations |  | 51 |
Tax Cuts and Jobs Act (“TCJA”) |  |  | (71)
Foreign tax credits from distributions |  |  | (8)
Other, net | 2 | (25) | (27)
Provision for Income Taxes, Total | $ 1,443 | $ 383 | $ 115
Effective Tax Rate | 21.60% | 23.00% | 17.60%

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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