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 | ||
|---|---|---|---|
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 | ||