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Performance Graph - Unaudited (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
United Technologies Corporation |  |  |  |  |  |
Performance Graph [Line Items] |  |  |  |  |  |
December, Graph Details | $ 168.81 | $ 144.23 | $ 168.50 | $ 163.30 | $ 115.10 | $ 100.00
S&P 500 Index |  |  |  |  |  |
Performance Graph [Line Items] |  |  |  |  |  |
December, Graph Details | 198.18 | 177.01 | 174.60 | 153.57 | 116.00 | 100.00
Dow Jones Industrial Average |  |  |  |  |  |
Performance Graph [Line Items] |  |  |  |  |  |
December, Graph Details | $ 183.61 | $ 157.61 | $ 157.28 | $ 142.93 | $ 110.24 | $ 100.00

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