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Description of Business and Summary of Significant Accounting Policies (Details 4) - USD ($) $ in Millions | 12 Months Ended
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May 31, 2016 | May 31, 2015 | May 31, 2014
Capitalized Interest [Abstract] |  |  |
Interest Costs Capitalized | $ 42 | $ 37 | $ 29

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- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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