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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | May 31, 2016 | May 31, 2015
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Assets, Fair Value Disclosure [Abstract] |  |
Cash | $ 774 | $ 615
Assets at Fair Value | 5,467 | 5,932
Cash Equivalents | 3,138 | 3,852
Short-term Investments | 2,319 | 2,072
Other Long-term Assets | 10 | 8
Fair Value, Inputs, Level 1 | U.S. Treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 1,265 | 869
Cash Equivalents | 100 | 225
Short-term Investments | 1,165 | 644
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 3,418 | 4,440
Cash Equivalents | 2,264 | 3,012
Short-term Investments | 1,154 | 1,428
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 | Time deposits |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 831 | 684
Cash Equivalents | 827 | 684
Short-term Investments | 4 | 0
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 | U.S. Agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 679 | 976
Cash Equivalents | 0 | 110
Short-term Investments | 679 | 866
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 | Commercial paper and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 733 | 914
Cash Equivalents | 262 | 352
Short-term Investments | 471 | 562
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 1,175 | 1,866
Cash Equivalents | 1,175 | 1,866
Short-term Investments | 0 | 0
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 3 | Non-marketable preferred stock |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 10 | 8
Cash Equivalents | 0 | 0
Short-term Investments | 0 | 0
Other Long-term Assets | $ 10 | $ 8

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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