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Business Acquisitions, Dispositions, Goodwill and Intangible Assets (Intangible Assets) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |
Trademarks and other | $ 3,916 | $ 3,918 |
Total | 34,449 | 33,477 |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount | 30,533 | 29,559 |
Accumulated Amortization | 8,403 | 7,053 |
Business Acquisition [Line Items] |  |  |
Contractual Obligation, Consumed in Current Year | 345 | 252 |
Goodwill [Line Items] |  |  |
Goodwill resulting from business combinations | 92 |  |
Goodwill, Purchase Accounting Adjustments | 475 |  |
Otis [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill resulting from business combinations | 16 |  |
Carrier [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill resulting from business combinations | 1 |  |
Eliminations and other [Member] |  |  |
Goodwill [Line Items] |  |  |
Goodwill resulting from business combinations | 0 |  |
Service Portfolios [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount | 2,105 | 2,164 |
Accumulated Amortization | 1,626 | 1,608 |
Patents and trademarks [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount | 356 | 361 |
Accumulated Amortization | 250 | 236 |
Collaboration [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount | 4,862 | 4,509 |
Accumulated Amortization | 920 | 649 |
Customer Relationships and Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Amount | 23,210 | 22,525 |
Accumulated Amortization | 5,607 | $ 4,560 |
Goodwill [Line Items] |  |  |
Goodwill, Purchase Accounting Adjustments | 400 |  |
Rockwell Collins [Member] |  |  |
Business Acquisition, Pro Forma Earnings Per Share, Basic |  | $ 6.82 | $ 5.45
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  | $ 6.76 | $ 5.39
Business Acquisition [Line Items] |  |  |
Contractual Obligation, Consumed in Current Year | 129 |  |
Goodwill [Line Items] |  |  |
Goodwill resulting from business combinations | $ 20,537 |  |

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