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Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Feb. 28, 2021 | Feb. 29, 2020 | Feb. 28, 2021 | Feb. 29, 2020 | May 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Federal income tax rate |  |  | 12.30% | 9.80% |
Total gross unrecognized tax benefits, excluding related interest and penalties | $ 877 |  | $ 877 |  | $ 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 | 622 |  | 622 |  |
Income tax expense | 187 | $ 34 | 589 | $ 362 |
Increase (decrease) in liability for payment of interest and penalties | 41 |  | 41 |  |
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit) | 199 |  | 199 |  | $ 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 | 50 |  | $ 50 |  |
Altera Corp. V. Commissioner |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized tax benefits recognized | 74 |  |  |  |
Income tax expense | $ 69 |  |  |  |

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