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Stock-Based Compensation - Schedule of Stock Option Vesting (Details) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2017 | May 31, 2016 | May 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures Abstract |  |  |
Vested during the year | 2,427,837 | 2,572,129 | 2,611,524
Fair value | $ 104 | $ 98 | $ 83

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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options vested. + References No definition available. + Details
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