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Long-Term Financing Receivables (Reserve and Additional Information) (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
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Receivables [Abstract] |  |
Long Term Receivables High Credit Risk Percentage | 13.00% | 13.00%
Financing Receivable Reserve For Credit Losses And Exposure | $ 17 | $ 17

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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition Long Term Receivables High Credit Risk Percentage + References No definition available. + Details
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Namespace Prefix: | utx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant