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Business Acquisitions, Dispositions, Goodwill and Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2019
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]  
Schedule of Goodwill [Table Text Block]
(dollars in millions)Balance as of
January 1,
2019		Goodwill
resulting from
business
combinations		Foreign
currency
translation
and other		Balance as of
December 31,
2019
Otis$1,688  $16  $(57) $1,647  
Carrier9,835  1  (29) 9,807  
Pratt & Whitney1,567  —  (4) 1,563  
Collins Aerospace Systems35,001  75  (51) 35,025  
Total Segments48,091  92  (141) 48,042  
Eliminations and other21  —  —  21  
Total$48,112  $92  $(141) $48,063  
Intangible Assets Disclosure [Table Text Block]
 20192018
(dollars in millions)Gross
Amount		Accumulated
Amortization		Gross
Amount		Accumulated
Amortization
Amortized:
Service portfolios$2,105  $(1,626) $2,164  $(1,608) 
Patents and trademarks356  (250) 361  (236) 
Collaboration intangible assets4,862  (920) 4,509  (649) 
Customer relationships and other23,210  (5,607) 22,525  (4,560) 
 30,533  (8,403) 29,559  (7,053) 
Unamortized:
Trademarks and other3,916  —  3,918  —  
Total$34,449  $(8,403) $33,477  $(7,053) 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]
(dollars in millions)20202021202220232024
Amortization expense$1,438$1,420$1,420$1,411$1,381