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Performance Graph - Unaudited (Tables) | 12 Months Ended
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Dec. 31, 2019
Performance Graph [Abstract] |
Cumulative Total Shareholder Return [Table Text Block] | COMPARISON OF CUMULATIVE FIVE YEAR TOTAL RETURN

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- Definition Tabular disclosure of the cumulative total shareholder return for the current year baselined to five years prior. + References No definition available. + Details
Name: | utx_CumulativeTotalShareholderReturnTableTextBlock
Namespace Prefix: | utx_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | utx_PerformanceGraphAbstract
Namespace Prefix: | utx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration