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Document and Entity Information - Jun. 30, 2015 - USD ($)
Total
Document and Entity Information [Abstract]  
Document Type 10-Q
Document Period End Date Jun. 30, 2015
Amendment Flag false
Document Fiscal Year Focus 2015
Document Fiscal Period Focus Q2
Current Fiscal Year End Date --12-31
Entity Registrant Name UNITED TECHNOLOGIES CORP /DE/
Entity Central Index Key 0000101829
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Filer Category Large Accelerated Filer
Entity Public Float $ 98,745,805,884
Entity Common Stock, Shares Outstanding 890,597,745