Name:	us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Agreed upon sale price of discontinued operation, subject to working capital and indebtedness adjustment.

No definition available.

Name:	utx_AgreedUponSalePrice
Namespace Prefix:	utx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to foreign income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

No definition available.

Name:	utx_DiscontinuedOperationTaxEffectofDiscontinuedOperationForeignEarnings
Namespace Prefix:	utx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Announcement date of the disposal of a component of the company. The sale of the component is probable and the sale is expected to be complete within one year. The component is classified as discontinued operations on the income statement and assets/liabilities held for sale on the balance sheet.

No definition available.

Name:	utx_DisposalGroupIncludingDiscontinuedOperationHeldForSaleDate
Namespace Prefix:	utx_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

Net cash amount received from agreed upon sale price of discontinued operation. The amount is on an after-tax basis and is subject to a working capital and net indebtedness adjustment.

No definition available.