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Acquisition, Dispositions, Goodwill and Other Intangible Assets (Goodwill) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)
Goodwill [Line Items]
Goodwill - Beginning Balance	$ 27,796
Goodwill Resulting from Business Combinations	390
Goodwill - Foreign Currency Translation and Other	(253)
Goodwill - Ending Balance	27,933
Otis [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	1,664
Goodwill Resulting from Business Combinations	6
Goodwill - Foreign Currency Translation and Other	(67)
Goodwill - Ending Balance	1,603
UTC Climate, Controls & Security [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	9,408
Goodwill Resulting from Business Combinations	348
Goodwill - Foreign Currency Translation and Other	(121)
Goodwill - Ending Balance	9,635
Pratt & Whitney [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	1,481
Goodwill Resulting from Business Combinations	36
Goodwill - Foreign Currency Translation and Other	0
Goodwill - Ending Balance	1,517
UTC Aerospace Systems [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	14,892
Goodwill Resulting from Business Combinations	0
Goodwill - Foreign Currency Translation and Other	(61)
Goodwill - Ending Balance	14,831
Sikorsky [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	347
Goodwill Resulting from Business Combinations	0
Goodwill - Foreign Currency Translation and Other	(3)
Goodwill - Ending Balance	344
Total Segments [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	27,792
Goodwill Resulting from Business Combinations	390
Goodwill - Foreign Currency Translation and Other	(252)
Goodwill - Ending Balance	27,930
Eliminations and other [Member]
Goodwill [Line Items]
Goodwill - Beginning Balance	4
Goodwill Resulting from Business Combinations	0
Goodwill - Foreign Currency Translation and Other	(1)
Goodwill - Ending Balance	$ 3

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 45



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 350



-SubTopic 20



-Section 50



-Paragraph 1



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