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Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Aug. 31, 2016 | Aug. 31, 2015 | May 31, 2016
Income Tax Contingency [Line Items] |  |  |
Effective tax rate on continuing operations (percent) | 2.50% | 18.40% |
Total gross unrecognized tax benefits, excluding related interest and penalties | $ 387 |  | $ 506
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 | 162 |  |
Change in income tax penalties and interest accrued | 13 |  |
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit) | 196 |  | $ 209
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations | 87 |  |
Tax Year 2011 | Domestic Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Proposed increase in tax related to the foreign tax credit matter | $ 254 |  |

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