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Stock-Based Compensation - Schedule of Stock Option Vesting (Details) - USD ($) $ in Millions	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures Abstract
Vested during the year	2,465,493	2,427,837	2,572,129
Fair value	$ 112	$ 104	$ 98

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- References

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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=96867065&loc=d3e5070-113901

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- Definition

Number of options vested.

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No definition available.

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