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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 Taxes (Parenthetical) (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2020 | May 31, 2019 | May 31, 2018
Income Taxes [Line Items] |  |  |
Provisional benefit related to remeasurement of net U.S. deferred tax liability |  |  | $ (1,150)
Foreign deferred tax benefits | $ (128) | $ (17) | (579)
U.S. deferred tax expenses | $ 475 | $ (61) | 271
Corporate Structuring Transactions [Member] |  |  |
Income Taxes [Line Items] |  |  |
Foreign deferred tax benefits |  |  | 434
U.S. deferred tax expenses |  |  | 179
U.S. Plans [Member] |  |  |
Income Taxes [Line Items] |  |  |
Additional provisional amount recognized one time benefit |  |  | $ 204

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- Definition Tax cuts and jobs act of 2017 incomplete accounting additional provisional income tax expense benefit one time benefit. + References No definition available. + Details
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