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Income Taxes (Details 6) - USD ($) $ in Millions | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward |  |  |
Balance at beginning of year | $ 38 | $ 47 | $ 51
Increases for tax positions taken in the current year | 1 | 1 | 1
Increases for tax positions taken in prior years | 6 | 3 | 3
Decreases for tax positions taken in prior years | (2) | (3) | (3)
Settlements | (2) | (6) | (9)
Increases due to acquisitions |  |  | 4
Decrease from lapse of statute of limitations |  | (3) | (2)
Changes due to currency translation | (5) | (1) | 2
Balance at end of year | $ 36 | $ 38 | $ 47

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- Definition Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Unrecognized Tax Benefit -URI http://asc.fasb.org/extlink&oid=6527854 + Details
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