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Acquisitions, Dispositions, Goodwill and Other Intangible Assets (General Information) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Nov. 26, 2018
Business Acquisition [Line Items] |  |  |  |  |  |
Operating Income (Loss) | $ 2,486,000,000 | $ 1,838,000,000 | $ 7,115,000,000 | $ 6,642,000,000 |  |
Acquisition Cost Of Acquired Entities and Interest in Affiliates |  |  | 39,000,000 |  |  |
Proceeds from Issuance of Debt |  |  |  |  | $ 11,000,000,000.0 |
Proceeds from Debt, Net of Issuance Costs |  |  |  |  | $ 10,900,000,000 |
Goodwill Resulting from Business Combinations |  |  | 410,000,000 |  |  |
Contractual Obligation, Due in Next Fiscal Year | 36,000,000 |  | 36,000,000 |  |  |
Contractual Obligation, Due in Second Year | 114,000,000 |  | 114,000,000 |  |  |
Contractual Obligation, Due in Third Year | 101,000,000 |  | 101,000,000 |  |  |
Contractual Obligation, Due in Fourth Year | 106,000,000 |  | 106,000,000 |  |  |
Contractual Obligation, Due in Fifth Year | $ 91,000,000 |  | 91,000,000 |  |  |
Business Combination, Acquisition Related Costs |  |  | $ 30,000,000 | $ 71,000,000 |  |
Raytheon Company [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Date of Acquisition Agreement | Jun. 09, 2019 |  |  |  |  |
Business Acquisition, Name of Acquired Entity | Raytheon Company |  |  |  |  |
Business Acquisition UTC stock payable shares | 2.3348 |  | 2.3348 |  |  |
Rockwell Collins [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Operating Income (Loss) |  |  | $ 1,100,000,000 |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  | Nov. 26, 2018 |
Business Acquisition, Name of Acquired Entity |  |  |  |  | Rockwell Collins |
Business Acquisition Cash Paid Per Share |  |  |  |  | $ 93.33 |
Business Acquisition UTC stock payable |  |  |  |  | 0.37525 |
Payments to Acquire Businesses, Gross |  |  |  |  | 15,533,000,000 |
Payments to Acquire Businesses, Net of Cash Acquired |  |  |  |  | $ 14,900,000,000 |
Stock Issued During Period, Shares, Acquisitions |  |  |  |  | 62,200,000 |
Noncash or Part Noncash Acquisition, Debt Assumed |  |  |  |  | $ 7,800,000,000 |
Noncash or Part Noncash Acquisition, Value of Assets Acquired |  |  |  |  | 30,600,000,000 |
Stock Issued During Period, Value, Acquisitions |  |  |  |  | 7,960,000,000 |
Business Combination, Consideration Transferred |  |  |  |  | 23,493,000,000 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  |  |  |  | $ 640,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  |  |  |  | 1,665,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory |  |  |  |  |  | 1,512,000,000
Business combination, recognized identifiable assets acquired and liabilities assumed, contract with customer asset, current |  |  |  |  |  | 291,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other |  |  |  |  |  | 252,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent |  |  |  |  |  | 38,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment |  |  |  |  |  | 1,558,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets |  |  |  |  |  | 1,870,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets |  |  |  |  |  | 217,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  | 16,863,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt |  |  |  |  |  | 2,254,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable |  |  |  |  |  | 520,000,000
Business combination, recognized identifiable assets acquired and liabilities assumed, accrued liabilities current |  |  |  |  |  | 1,657,000,000
Business combination, recognized identifiable assets acquired and liabilities assumed, contract with customer liabilities, current |  |  |  |  |  | 299,000,000
Business Acquisition, Assumed Long-term Debt |  |  |  |  |  | 5,530,000,000
Business combination, recognized identifiable assets acquired and liabilities assumed, liability, defined benefit plan, noncurrent |  |  |  |  |  | 502,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other |  |  |  |  |  | 3,464,000,000
Business combination, recognized identifiable assets acquired and liabilities assumed, noncontrolling interest |  |  |  |  |  | 6,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  |  |  |  |  | 14,232,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  |  |  |  |  | 2,631,000,000
Goodwill Resulting from Business Combinations |  |  |  |  | $ 20,862,000,000 |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  |  |  | 23,493,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  |  |  | 10,690,000,000
Fair value adjustment, inventory |  |  |  |  |  | 282,000,000
Fair value adjustment, fixed assets |  |  |  |  |  | 256,000,000
Contractual Obligation |  |  |  |  |  | 1,020,000,000
Rockwell Collins [Member] | Customer Relationships [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  | 8,220,000,000
Rockwell Collins [Member] | Customer Relationships [Member] | Maximum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 20 years |  |  |
Rockwell Collins [Member] | Customer Relationships [Member] | Minimum [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 10 years |  |  |
Rockwell Collins [Member] | Technology-Based Intangible Assets [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  | $ 600,000,000
Finite-Lived Intangible Asset, Useful Life |  |  | 15 years |  |  |

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