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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2021 | Nov. 30, 2020 | Feb. 29, 2020 | Feb. 28, 2021 | Feb. 29, 2020 | May 31, 2019
Income Taxes [Line Items] |  |  |  |  |  |
Effective tax rate | 15.00% |  | 25.00% | 17.20% | 18.50% |
Income tax repatriation of foreign earnings and voluntary contributions to domestic pension plans | $ 108 |  |  |  |  |
Income tax expense (benefit) | $ 157 |  | $ 105 | $ 698 | $ 368 |
Benefit from reduction of valuation allowance |  |  |  |  | $ 133 |
Recognition of cumulative benefit from TCJA |  |  |  |  |  | $ 233
IRS [Member] |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Income tax expense (benefit) |  | $ (130) |  | $ (191) |  |

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