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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 | Nov. 30, 2019 | May 31, 2019
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Assets, Fair Value Disclosure [Abstract] |  |
Cash | $ 584 | $ 853
ASSETS AT FAIR VALUE | 3,502 | 4,663
CASH AND EQUIVALENTS | 3,070 | 4,466
SHORT-TERM INVESTMENTS | 432 | 197
Fair Value, Inputs, Level 1 | U.S. Treasury securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
ASSETS AT FAIR VALUE | 395 | 347
CASH AND EQUIVALENTS | 0 | 200
SHORT-TERM INVESTMENTS | 395 | 147
Fair Value, Inputs, Level 2 |  |
Assets, Fair Value Disclosure [Abstract] |  |
ASSETS AT FAIR VALUE | 2,523 | 3,463
CASH AND EQUIVALENTS | 2,486 | 3,413
SHORT-TERM INVESTMENTS | 37 | 50
Fair Value, Inputs, Level 2 | Commercial paper and bonds |  |
Assets, Fair Value Disclosure [Abstract] |  |
ASSETS AT FAIR VALUE | 33 | 34
CASH AND EQUIVALENTS | 1 | 1
SHORT-TERM INVESTMENTS | 32 | 33
Fair Value, Inputs, Level 2 | Money market funds |  |
Assets, Fair Value Disclosure [Abstract] |  |
ASSETS AT FAIR VALUE | 1,362 | 1,637
CASH AND EQUIVALENTS | 1,362 | 1,637
SHORT-TERM INVESTMENTS | 0 | 0
Fair Value, Inputs, Level 2 | Time deposits |  |
Assets, Fair Value Disclosure [Abstract] |  |
ASSETS AT FAIR VALUE | 1,127 | 1,791
CASH AND EQUIVALENTS | 1,123 | 1,775
SHORT-TERM INVESTMENTS | 4 | 16
Fair Value, Inputs, Level 2 | U.S. Agency securities |  |
Assets, Fair Value Disclosure [Abstract] |  |
ASSETS AT FAIR VALUE | 1 | 1
CASH AND EQUIVALENTS | 0 | 0
SHORT-TERM INVESTMENTS | $ 1 | $ 1

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + 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://fasb.org/us-gaap/role/ref/legacyRef -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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