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Income Taxes - Income before Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Aug. 31, 2015 | Aug. 31, 2014 | May. 31, 2015
Income Tax Contingency [Line Items] |  |  |
Effective tax rate on continuing operations (percent) | 18.40% | 21.70% |
Total gross unrecognized tax benefits, excluding related interest and penalties | $ 460 |  | $ 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 | 258 |  |
Change in income tax penalties and interest accrued | 13 |  |
Accrued interest and penalties related to uncertain tax positions (excluding federal benefit) | 177 |  | $ 164
Estimated decrease in total gross unrecognized tax benefits as a result of resolutions of global tax examinations and expiration of applicable statutes of limitations | 43 |  |
Tax Year 2011 | Domestic Tax Authority |  |  |
Income Tax Contingency [Line Items] |  |  |
Proposed increase in tax related to the foreign tax credit matter | $ 31 |  |

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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=6907707&loc=d3e32718-109319 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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