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Long-Term Financing Receivables(Class and Credit Risk Information) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net $ 1,480us-gaap_NotesReceivableNet $ 1,426us-gaap_NotesReceivableNet
Long-term trade accounts receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net 1,069us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= utx_LongTermTradeAccountsReceivableFinancingReceivableMember		 1,045us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= utx_LongTermTradeAccountsReceivableFinancingReceivableMember
Notes And leases receivable [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Financing Receivable, Net $ 411us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= utx_NotesAndLeasesReceivableFinancingReceivableMember		 $ 381us-gaap_NotesReceivableNet
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= utx_NotesAndLeasesReceivableFinancingReceivableMember