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Stock Based Compensation (Details 4) - USD ($) $ in Millions | 12 Months Ended
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May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Ratio Of Outstanding And Available To Grant Shares To Total Outstanding Common And Equity Compensation Shares And Equity Compensation Shares Available For Grant [Abstract] |  |  |
Ratio Of Outstanding And Available To Grant Shares To Total Outstanding Common And Equity Compensation Shares And Equity Compensation Shares Available For Grant | 9.00% |  |
Share Based Compensation Arrangement By Share Based Award Options Vesting During Years [Abstract] |  |  |
Vested during the year | 2,611,524 | 2,408,179 | 2,824,757
Fair Value | $ 83 | $ 65 | $ 81
Unrecognized Compensation Cost Related To Unvested Share Based Compensation Arrangements [Abstract] |  |  |
Total unrecognized compensation cost, net of estimated forfeitures | $ 183 |  |
Stock option remaining weighted average vesting period |  |  |

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- Definition Total outstanding and available for grant related equity compensation divided by the outstanding common and equity compensation shares and equity compensation shares available for grant. + References No definition available. + Details
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- Definition The weighted average fair value as of grant dates pertaining to stock options for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement. + References No definition available. + Details
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- Definition The number of stock options for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive shares, other instruments, or cash in accordance with the terms of the arrangement. + References No definition available. + Details
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- Definition Description of the period of time over which an employee's right to exercise an award continues to be contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year). + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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