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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 | May 31, 2021 | May 31, 2020 | May 31, 2019 | May 31, 2018
Income Taxes [Line Items] |  |  |  |  |
Earnings From Foreign Operations |  | $ 1,800 | $ 634 | $ 929 |
Income tax benefit |  | (1,443) | (383) | $ (115) |
Statutory Federal Income Tax Rate |  |  |  | 21.00% | 29.20%
Benefit from reduction of valuation allowance on tax loss carryforwards |  |  | 133 | $ 90 |
Deferred income tax expense | $ 51 | 802 | 348 | (85) |
Income tax benefit from accelerated deductions to be claimed on 2018 tax return |  |  |  | 75 |
Reduction in valuation allowance balance |  | (14) | 129 | 79 |
Recognition of cumulative benefit from TCJA |  |  |  | $ 233 |
Unrecognized Tax Benefits That Would Impact Effective Tax Rate | 127 | 190 | 127 |  |
Unrecognized Tax Benefits Accrued Income Tax Penalties And Interest | $ 41 | 61 | 41 |  |
Interest expense associated with uncertain tax positions |  | 20 |  |  |
Foreign Country [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating Loss Carryforwards |  | 3,000 |  |  |
Foreign Country [Member] | Fed Ex Express and TNT Express [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Reduction in valuation allowance balance |  | 70 |  |  |
State And Local Jurisdiction [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating Loss Carryforwards |  | 1,200 |  |  |
Domestic Tax Authority [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Operating Loss Carryforwards |  | $ 100 |  |  |
Maximum [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Statutory Federal Income Tax Rate |  |  |  | 35.00% |
Minimum [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Statutory Federal Income Tax Rate |  | 21.00% |  |  |
Netherlands [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Expense (benefit) from the impact on deferred tax assets attributable to a lower enacted tax rate |  | $ (66) |  | $ 50 |
IRS [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax benefit |  | 130 |  |  |
CARES Act [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax benefit |  | $ 279 | $ 71 |  |
Statutory Federal Income Tax Rate |  | 35.00% | 35.00% |  |

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