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Long-Term Financing Receivables (Reserve and Additional Information) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Receivables [Abstract] |  |
Long Term Receivables High Credit Risk | $ 140 | $ 170
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment | $ 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition Long Term Receivables High Credit Risk + References No definition available. + Details
Name: | utx_LongTermReceivablesHighCreditRisk
Namespace Prefix: | utx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant