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Income Taxes - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2018 | Feb. 28, 2018 | May 31, 2018 | May 31, 2017 | May 31, 2016 | May 31, 2015
Income Tax Contingency [Line Items] |  |  |  |  |  |
Federal income tax rate |  |  | 29.20% | 35.00% | 35.00% |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense |  | $ 2,010 | $ 1,875 |  |  |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, provisional income tax expense |  |  | $ 158 |  |  |
Income tax benefits attributable to employee stock-based compensation |  |  |  | $ 177 | $ 281 |
Effective tax rate, change from prior period |  |  |  | (5.50%) |  |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, transition tax for accumulated foreign earnings, increase (decrease) in provisional income tax expense | $ 135 |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, transition tax for accumulated foreign earnings, installments period |  |  | 8 years |  |  |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, change in tax rate, deferred tax asset, provisional income tax expense, gross |  |  | $ 158 |  |  |
Total gross unrecognized tax benefits, excluding related interest and penalties | 698 |  | 698 | $ 461 | 506 | $ 438
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 | 478 |  | 478 |  |  |
Increase (decrease) in liability for payment of interest and penalties | (14) |  | (14) | (38) | 45 |
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit) | 157 |  | 157 | 171 |  |
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations | 163 |  | 163 |  |  |
Reinvestment of the cumulative undistributed earnings of certain foreign subsidiaries | 12,200 |  | $ 12,200 |  |  |
Tax holiday, expiration period |  |  | 2021 |  |  |
Decrease in income tax expense related to tax holiday |  |  | $ 126 | $ 187 | $ 173 |
Decrease in income tax expense related to tax holiday per diluted share, (in dollars per share) |  |  | $ 0.08 | $ 0.11 | $ 0.10 |
Valuation allowance increase (decrease) related to tax benefits of certain subsidiaries with operating losses |  |  | $ 13 | $ 30 | $ 43 |
Foreign tax credit carry-forwards | 0 |  | 0 | $ 208 |  |
Available domestic and foreign loss carry-forwards | $ 289 |  | 289 |  |  |
Deferred income taxes and other liabilities |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Tax Cuts And Jobs Act Of 2017, incomplete accounting, transition tax for accumulated foreign earnings, provisional income tax expense |  |  | $ 1,078 |  |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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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://www.xbrl.org/2003/role/presentationRef -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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- Definition The aggregate cash inflow comprised of the amount received from (a) employees to acquire the entity's shares under incentive awards, including stock option exercises and restricted stock arrangements, and (b) the excess tax benefit arising from such transactions. + References No definition available. + Details
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