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Fair Value Measurements (Fair Value Techniques) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Carrying Amount [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | $ 127 | $ 122
Customer Financing Notes Receivable | 437 | 403
Short-Term Borrowings | 600 | 926
Long-term debt (excluding capitalized leases) | 23,280 | 19,476
Long-term liabilities | 457 | 458
Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 121 | 107
Customer Financing Notes Receivable | 420 | 403
Short-Term Borrowings | 600 | 926
Long-term debt (excluding capitalized leases) | 25,110 | 21,198
Long-term liabilities | 427 | $ 419
Level 1 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 0 |
Customer Financing Notes Receivable | 0 |
Short-Term Borrowings | 0 |
Long-term debt (excluding capitalized leases) | 0 |
Long-term liabilities | 0 |
Level 2 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 121 |
Customer Financing Notes Receivable | 420 |
Short-Term Borrowings | 522 |
Long-term debt (excluding capitalized leases) | 24,906 |
Long-term liabilities | 427 |
Level 3 | Fair Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term receivables | 0 |
Customer Financing Notes Receivable | 0 |
Short-Term Borrowings | 78 |
Long-term debt (excluding capitalized leases) | 204 |
Long-term liabilities | $ 0 |

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- 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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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition This element is used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of customer financing notes receivable. + References No definition available. + Details
Name: | utx_CustomerFinancingNotesReceivableFairValueDisclosure
Namespace Prefix: | utx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element is used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of long-term borrowings (excluding capitalized leases). + References No definition available. + Details
Name: | utx_LongTermDebtExcludingCapitalizedLeasesFairValueDisclosure
Namespace Prefix: | utx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element is used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of long-term receivables. + References No definition available. + Details
Name: | utx_LongTermReceivablesFairValueDisclosure
Namespace Prefix: | utx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition This element is used in connection with the recurring fair value measurement disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of lother long-term liabilities. + References No definition available. + Details
Name: | utx_OtherLongTermLiabilitiesFairValueDisclosure
Namespace Prefix: | utx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition This element is used in connection with the recurring fair value measurement disclosures required in the footnote disclosures to the financial statements. This element represents the fair value of short-term borrowings. + References No definition available. + Details
Name: | utx_ShortTermBorrowingsFairValueDisclosure
Namespace Prefix: | utx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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