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Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Nov. 30, 2020 | Nov. 30, 2019 | Nov. 30, 2020 | Nov. 30, 2019 | May 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Federal income tax rate |  |  | 12.70% | 11.70% |
Total gross unrecognized tax benefits, excluding related interest and penalties | $ 872 |  | $ 872 |  | $ 771
Total gross unrecognized tax benefits, excluding related interest and penalties, amount which would affect the Company's effective tax rate if recognized in future periods | 587 |  | 587 |  |
Income tax expense | 205 | $ 134 | 402 | $ 328 |
Increase (decrease) in liability for payment of interest and penalties | 33 |  | 33 |  |
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit) | 191 |  | 191 |  | $ 158
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations | 60 |  | $ 60 |  |
Altera Corp. V. Commissioner |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized tax benefits recognized | 77 |  |  |  |
Income tax expense | $ 71 |  |  |  |

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