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Long-Term Financing Receivables (Reserve and Additional Information) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Long Term Receivables High Credit Risk Percentage	7.00%	7.00%
Financing Receivable Reserve For Credit Losses And Exposure	$ 17	$ 10

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- References

No definition available.

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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- Definition

A valuation allowance for financing receivables that are expected to be uncollectible and/or contain collateral exposure risk.

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No definition available.

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Name:	utx_FinancingReceivableReserveForCreditLossesAndExposure
Namespace Prefix:	utx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Long Term Receivables High Credit Risk Percentage

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No definition available.

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Name:	utx_LongTermReceivablesHighCreditRiskPercentage
Namespace Prefix:	utx_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant