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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, 2015 | May. 31, 2015
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Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Cash | $ 746 | $ 615
Assets at Fair Value | 5,417 | 5,932
Cash and Equivalents | 3,246 | 3,852
Short-term Investments | 2,162 | 2,072
Other Long-term Assets | 9 | 8
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 | 1,050 | 869
Cash and Equivalents | 275 | 225
Short-term Investments | 775 | 644
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 | 3,612 | 4,440
Cash and Equivalents | 2,225 | 3,012
Short-term Investments | 1,387 | 1,428
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 | 616 | 684
Cash and Equivalents | 616 | 684
Short-term Investments | 0 | 0
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 | 872 | 976
Cash and Equivalents | 15 | 110
Short-term Investments | 857 | 866
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 | 685 | 914
Cash and Equivalents | 155 | 352
Short-term Investments | 530 | 562
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 | 1,439 | 1,866
Cash and Equivalents | 1,439 | 1,866
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 | 9 | 8
Cash and Equivalents | 0 | 0
Short-term Investments | 0 | 0
Other Long-term Assets | $ 9 | $ 8

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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=36462937&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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