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Business Acquisitions, Dispositions, Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |
Goodwill | $ 27,910 | $ 27,059
Goodwill resulting from business combinations | 158 |
Goodwill, foreign currency translation and other | 693 |
Otis [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 1,737 | 1,575
Goodwill resulting from business combinations | 28 |
Goodwill, foreign currency translation and other | 134 |
UTC Climate, Controls and Security [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 10,009 | 9,487
Goodwill resulting from business combinations | 130 |
Goodwill, foreign currency translation and other | 392 |
Pratt and Whitney [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 1,511 | 1,511
Goodwill resulting from business combinations | 0 |
Goodwill, foreign currency translation and other | 0 |
UTC Aerospace Systems [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 14,650 | 14,483
Goodwill resulting from business combinations | 0 |
Goodwill, foreign currency translation and other | 167 |
Eliminations and other [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 3 | 3
Goodwill resulting from business combinations | 0 |
Goodwill, foreign currency translation and other | 0 |
Total Segments [Member] |  |
Goodwill [Line Items] |  |
Goodwill | 27,907 | $ 27,056
Goodwill resulting from business combinations | 158 |
Goodwill, foreign currency translation and other | $ 693 |

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- 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 -Subparagraph (a) -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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