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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 | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2018 | Feb. 28, 2018 | May 31, 2018 | May 31, 2017 | May 31, 2016
Income Taxes [Line Items] |  |  |  |  |
Foreign deferred tax benefits |  |  | $ (579) | $ (108) | $ (2)
U.S. deferred tax expenses |  |  | 271 | 989 | $ 155
Provisional benefit related to remeasurement of net U.S. deferred tax liability | $ (1,150) | $ (1,150) | (1,150) |  |
Benefits from share-based payments |  |  | 60 | 55 |
U.S. Plans [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Additional provisional amount recognized one time benefit | $ 204 | $ 204 |  |  |
Corporate Structuring Transactions [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Foreign deferred tax benefits |  |  | 434 | 94 |
U.S. deferred tax expenses |  |  | $ 179 | $ 26 |

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