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Business Acquisitions, Dispositions, Goodwill and Intangible Assets (Goodwill) (Details) - USD ($) $ / shares in Units, $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |  |
Goodwill | $ 48,063 | $ 48,063 | $ 48,112 |
Goodwill resulting from business combinations |  | 92 |  |
Goodwill, foreign currency translation and other |  | (141) |  |
Goodwill, Purchase Accounting Adjustments |  | 475 |  |
Business Acquisition [Line Items] |  |  |  |
Contractual Obligation, Consumed in Current Year |  | 345 | 252 |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of Taylor Company |  |  | 1,000 |
Gain on sale of Taylor Company |  | 0 | 799 | $ 0
After tax gain on the sale of Taylor Company |  |  | 591 |
Customer Relationships [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Purchase Accounting Adjustments |  | 400 |  |
Otis [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 1,647 | 1,647 | 1,688 |
Goodwill resulting from business combinations |  | 16 |  |
Goodwill, foreign currency translation and other |  | (57) |  |
Carrier [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 9,807 | 9,807 | 9,835 |
Goodwill resulting from business combinations |  | 1 |  |
Goodwill, foreign currency translation and other |  | (29) |  |
Pratt and Whitney [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 1,563 | 1,563 | 1,567 |
Goodwill resulting from business combinations |  | 0 |  |
Goodwill, foreign currency translation and other |  | (4) |  |
Collins Aerospace Systems [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 35,025 | 35,025 | 35,001 |
Goodwill resulting from business combinations |  | 75 |  |
Goodwill, foreign currency translation and other |  | (51) |  |
Eliminations and other [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | 21 | 21 | 21 |
Goodwill resulting from business combinations |  | 0 |  |
Goodwill, foreign currency translation and other |  | 0 |  |
Total Segments [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill | $ 48,042 | 48,042 | $ 48,091 |
Goodwill resulting from business combinations |  | 92 |  |
Goodwill, foreign currency translation and other |  | (141) |  |
Selling, General and Administrative Expenses [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Portfolio separation costs |  | 730 |  |
Income tax expense [Domain] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Portfolio separation costs |  | 600 |  |
Rockwell Collins [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill resulting from business combinations |  | 20,537 |  |
Business Acquisition [Line Items] |  |  |  |
Contractual Obligation, Consumed in Current Year |  | $ 129 |  |
Business Acquisition, Pro Forma Earnings Per Share, Basic |  |  | $ 6.82 | $ 5.45
Business Acquisition, Pro Forma Earnings Per Share, Diluted |  |  | $ 6.76 | $ 5.39
Raytheon Company [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition UTC stock payable shares | 2.3348 | 2.3348 |  |
Business Acquisition, Date of Acquisition Agreement | Jun. 09, 2019 |  |  |

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