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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 | Feb. 28, 2017 | May 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash | $ 610 | $ 774
Assets at Fair Value | 6,170 | 5,467
Cash and Equivalents | 4,021 | 3,138
Short-term Investments | 2,139 | 2,319
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 | 1,195 | 1,265
Cash and Equivalents | 150 | 100
Short-term Investments | 1,045 | 1,165
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 | 4,355 | 3,418
Cash and Equivalents | 3,261 | 2,264
Short-term Investments | 1,094 | 1,154
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 | 839 | 831
Cash and Equivalents | 812 | 827
Short-term Investments | 27 | 4
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 | 633 | 679
Cash and Equivalents | 260 | 0
Short-term Investments | 373 | 679
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 | 854 | 733
Cash and Equivalents | 160 | 262
Short-term Investments | 694 | 471
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 | 2,029 | 1,175
Cash and Equivalents | 2,029 | 1,175
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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