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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, 2018 | May 31, 2018
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash | $ 481 | $ 415
Assets at Fair Value | 4,052 | 5,256
Cash and Equivalents | 3,423 | 4,249
Short-term Investments | 618 | 996
Other Long-term Assets | 11 | 11
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 | 359 | 1,178
Cash and Equivalents | 0 | 500
Short-term Investments | 359 | 678
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 | 3,201 | 3,652
Cash and Equivalents | 2,942 | 3,334
Short-term Investments | 259 | 318
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 | 1,421 | 925
Cash and Equivalents | 1,318 | 907
Short-term Investments | 103 | 18
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 | 52 | 102
Cash and Equivalents | 50 | 100
Short-term Investments | 2 | 2
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 | 205 | 451
Cash and Equivalents | 51 | 153
Short-term Investments | 154 | 298
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 | 1,523 | 2,174
Cash and Equivalents | 1,523 | 2,174
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 | 11 | 11
Cash and Equivalents | 0 | 0
Short-term Investments | 0 | 0
Other Long-term Assets | $ 11 | $ 11

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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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