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Accrued Liabilities Narrative (Details) CAD in Millions, $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD | Dec. 31, 2016 USD ($)
Accrued Liabilities [Abstract] |  |  |  |
Candadian Government Amendment Arrangements, Annual Payment Amount |  | $ 256 | CAD 327 |
Canadian Government Amendment Arrangements, Expense | $ 867 |  |  |
Canadian Government Amendment Arrangements, Remaining Liability |  | $ 256 |  | $ 477

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

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- Definition Expense recorded related to Canadian Government Amendment Arrangements. + References No definition available. + Details
Name: | utx_CanadianGovernmentAmendmentArrangementsExpense
Namespace Prefix: | utx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Remaining liability associated with the amendment of arrangements with the Canadian Government. + References No definition available. + Details
Name: | utx_CanadianGovernmentAmendmentArrangementsRemainingLiability
Namespace Prefix: | utx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Amount of annual payment in accrued liabilities related to the amendment of arrangements with the Canadian Government. + References No definition available. + Details
Name: | utx_CandadianGovernmentAmendmentArrangementsAnnualPaymentAmount
Namespace Prefix: | utx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant