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Income Taxes (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Nov. 30, 2019 | Nov. 30, 2018 | May 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Federal income tax rate | 11.70% | 14.50% |
Total gross unrecognized tax benefits, excluding related interest and penalties | $ 804 |  | $ 808
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 | 545 |  |
Increase (decrease) in liability for payment of interest and penalties | (30) |  |
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit) | 144 |  | $ 174
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 |  |

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- Definition The amount the liability recorded for the income tax examination increased or decreased in the current year/accounting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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