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Description of Business and Summary of Significant Accounting Policies (Details 6) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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May 31, 2016 | May 31, 2015 | May 31, 2014
Treasury Shares [Abstract] |  |  |
Stock Repurchase Program, Number Of Shares Authorized To Be Repurchased | 25,000,000 |  |
Purchase of treasury stock | $ 2,722 | $ 1,254 | $ 4,857
Treasury Stock Acquired, Average Cost Per Share | $ 149.35 | $ 154.03 | $ 131.83
Purchase of treasury stock | 18,200,000 | 8,100,000 | 36,800,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased | 19,000,000 |  |
Stock Repurchase Program Number Of Shares Authorized To Be Repurchased Under the Previously Completed Program | 15,000,000 |  |

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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