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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 | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2018 | May 31, 2019 | May 31, 2018 | May 31, 2017
Income Taxes [Line Items] |  |  |  |
Provisional benefit related to remeasurement of net U.S. deferred tax liability | $ (1,150) |  | $ (1,150) |
Foreign deferred tax benefits |  | $ (17) | (579) | $ (108)
U.S. deferred tax expenses |  | $ (61) | 271 | 989
Corporate Structuring Transactions [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Foreign deferred tax benefits |  |  | 434 | 94
U.S. deferred tax expenses |  |  | 179 | $ 26
U.S. Plans [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Additional provisional amount recognized one time benefit | $ 204 |  | $ 204 |

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- Definition Tax cuts and jobs act of 2017 in complete accounting change in tax rate provisional income tax expense (benefit). + References No definition available. + Details
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