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Performance Graph - Unaudited (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
United Technologies Corporation |  |  |  |  |  |
Performance Graph [Line Items] |  |  |  |  |  |
December, Graph Details | $ 174.62 | $ 146.66 | $ 125.30 | $ 146.39 | $ 141.87 | $ 100.00
S&P 500 Index |  |  |  |  |  |
Performance Graph [Line Items] |  |  |  |  |  |
December, Graph Details | 208.14 | 170.84 | 152.59 | 150.51 | 132.39 | 100.00
Dow Jones Industrial Average |  |  |  |  |  |
Performance Graph [Line Items] |  |  |  |  |  |
December, Graph Details | $ 213.38 | $ 166.56 | $ 142.98 | $ 142.67 | $ 129.65 | $ 100.00

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