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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 | Aug. 31, 2017 | May 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash | $ 624 | $ 505
Assets at Fair Value | 5,529 | 6,189
Cash and Equivalents | 3,413 | 3,808
Short-term Investments | 2,106 | 2,371
Other Long-term Assets | 10 | 10
Fair Value Measurements Using Level 1 | U.S. Treasury securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets at Fair Value | 1,205 | 1,545
Cash and Equivalents | 200 | 159
Short-term Investments | 1,005 | 1,386
Other Long-term Assets | 0 | 0
Fair Value Measurements Using Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets at Fair Value | 3,690 | 4,129
Cash and Equivalents | 2,589 | 3,144
Short-term Investments | 1,101 | 985
Other Long-term Assets | 0 | 0
Fair Value Measurements Using Level 2 | Time deposits |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets at Fair Value | 901 | 813
Cash and Equivalents | 862 | 769
Short-term Investments | 39 | 44
Other Long-term Assets | 0 | 0
Fair Value Measurements Using Level 2 | U.S. Agency securities |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets at Fair Value | 354 | 522
Cash and Equivalents | 50 | 150
Short-term Investments | 304 | 372
Other Long-term Assets | 0 | 0
Fair Value Measurements Using Level 2 | Commercial paper and bonds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets at Fair Value | 797 | 820
Cash and Equivalents | 39 | 251
Short-term Investments | 758 | 569
Other Long-term Assets | 0 | 0
Fair Value Measurements Using Level 2 | Money market funds |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets at Fair Value | 1,638 | 1,974
Cash and Equivalents | 1,638 | 1,974
Short-term Investments | 0 | 0
Other Long-term Assets | 0 | 0
Fair Value Measurements Using Level 3 | Non-marketable preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Assets at Fair Value | 10 | 10
Cash and Equivalents | 0 | 0
Short-term Investments | 0 | 0
Other Long-term Assets | $ 10 | $ 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 -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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