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Acquisitions, Dispositions, Goodwill and Other Intangible Assets (General Information) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 04, 2017
Business Acquisition [Line Items] |  |  |  |
Acquisition Cost Of Acquired Entities and Interest in Affiliates |  | $ 177,000,000 |  |
Gain on sale of Taylor Company |  | 799,000,000 | $ 0 |
Proceeds from Issuance of Debt |  | 11,000,000,000 |  |
Unsecured bridge loan credit agreement |  |  |  | $ 6,500,000,000
Proceeds from sale of Taylor Company |  | 1,000,000,000 |  |
After tax gain on sale of Taylor Company |  | 591,000,000 |  |
Proceeds from Debt, Net of Issuance Costs |  | 10,900,000,000 |  |
Restricted Cash | $ 9,245,000,000 | 9,245,000,000 | $ 33,000,000 |
Rockwell Collins [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Date of Acquisition Agreement | Sep. 04, 2017 |  |  |
Business Acquisition, Name of Acquired Entity | Rockwell Collins, Inc. (Rockwell Collins) |  |  |
Business Acquisition Cash Paid Per Share | $ 93.33 |  |  |
Business Acquisition UTC stock payable | 46.67 |  |  |
Payments to Acquire Businesses, Gross | 15,000,000,000 |  |  |
Proceeds from Issuance of Debt | 9,200,000,000 |  |  |
Unsecured bridge loan credit agreement | 6,500,000,000 | 6,500,000,000 |  |
Business Acquisition, Assumed Long-term Debt | $ 7,000,000,000 | $ 7,000,000,000 |  |

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