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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, 2018 | May 31, 2017
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Assets, Fair Value Disclosure [Abstract] |  |
Cash | $ 415 | $ 505
Assets at Fair Value | 5,256 | 6,189
Cash Equivalents | 4,249 | 3,808
Short-term Investments | 996 | 2,371
Other Long-term Assets | 11 | 10
Fair Value, Inputs, Level 1 | U.S. Treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 1,178 | 1,545
Cash Equivalents | 500 | 159
Short-term Investments | 678 | 1,386
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 3,652 | 4,129
Cash Equivalents | 3,334 | 3,144
Short-term Investments | 318 | 985
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 | Time deposits |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 925 | 813
Cash Equivalents | 907 | 769
Short-term Investments | 18 | 44
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 | U.S. Agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 102 | 522
Cash Equivalents | 100 | 150
Short-term Investments | 2 | 372
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 | Commercial paper and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 451 | 820
Cash Equivalents | 153 | 251
Short-term Investments | 298 | 569
Other Long-term Assets | 0 | 0
Fair Value, Inputs, Level 2 | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
Assets at Fair Value | 2,174 | 1,974
Cash Equivalents | 2,174 | 1,974
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 | 11 | 10
Cash Equivalents | 0 | 0
Short-term Investments | 0 | 0
Other Long-term Assets | $ 11 | $ 10

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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 -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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- Definition Fair value portion 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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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