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v3.19.3.a.u2

Summary of Accounting Principles (Indefinite Lived Intangible Assets) (Details) | 12 Months Ended
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Dec. 31, 2019
Collaboration Asset [Member] | Maximum [Member] |
Indefinite-lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 30 years
Customer Relationships [Member] | Minimum [Member] |
Indefinite-lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 1 year
Customer Relationships [Member] | Maximum [Member] |
Indefinite-lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 32 years
Purchased Service Contracts [Member] | Minimum [Member] |
Indefinite-lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 5 years
Purchased Service Contracts [Member] | Maximum [Member] |
Indefinite-lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 25 years
Patents & trademarks [Member] | Minimum [Member] |
Indefinite-lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 4 years
Patents & trademarks [Member] | Maximum [Member] |
Indefinite-lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 40 years
Exclusivity Assets [Member] | Minimum [Member] |
Indefinite-lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 5 years
Exclusivity Assets [Member] | Maximum [Member] |
Indefinite-lived Intangible Assets [Line Items] |
Finite-Lived Intangible Asset, Useful Life | 25 years

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_CustomerRelationshipsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_ServiceAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=utx_PatentsAndTrademarksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=utx_ExclusivityAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |