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Acquisitions, Dispositions, Goodwill and Other Intangible Assets (General Information) (Details) - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 03, 2020 | Mar. 31, 2020 | Mar. 31, 2019
Business Acquisition [Line Items] |  |  |  |
Acquisition Cost Of Acquired Entities and Interest in Affiliates |  |  | $ 5 |
Impairment of Intangible Asset, Tradename |  |  | 40 |
Carrier [Member] | Forecast [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Shares of common stock distributed in the Distribution |  | 866,158,910 |  |
Otis [Member] | Forecast [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Shares of common stock distributed in the Distribution |  | 433,079,455 |  |
Selling, General and Administrative Expenses [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Portfolio separation costs |  |  | 271 |
Interest Expense [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Portfolio separation costs |  |  | 6 |
Income tax expense [Domain] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Portfolio separation costs |  |  | 500 |
Debt Extinguishment Costs [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Portfolio separation costs |  |  | 660 |
Raytheon Company [Member] |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Pro Forma Nonrecurring Adjustment, Amortization of inventory and fixed asset fair value adjustment | [1] |  | (9) | $ (10)
Pro Forma Nonrecurring Adjustment, Amortization of acquired Rockwell Collins intangible assets, net | [2] |  | (273) | (266)
Pro Forma Nonrecurring Adjustment, Utilization of contractual customer obligation | [3] |  | 8 | 15
Pro Forma Nonrecurring Adjustment, Adjustment to net periodic pension cost | [4] |  | $ 239 | $ 241
Raytheon Company [Member] | Forecast [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition UTC stock payable shares |  | 2.3348 |  |
[1] | Reflects the amortization of the fixed asset fair value adjustment as of the acquisition date.
[2] | Reflects the additional amortization of the acquired Raytheon Company's intangible assets recognized at fair value in purchase accounting and eliminates the historical Raytheon Company intangible asset amortization expense.
[3] | Reflects the additional amortization of liabilities recognized for acquired contracts with terms less favorable than could be realized in market transactions as of the acquisition date.
[4] | Represents the impact of the pension and postretirement service cost expense as determined under RTC’s plan assumptions.

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- Definition Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- Definition The total cost of acquired entities and interest in affiliates including the cash paid to shareholders, fair value of debt and equity securities issued to shareholders, the fair value of the liabilities assumed, and direct costs of the acquisitions and interest in affiliates. + References No definition available. + Details
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- Definition Reflects adjustments for the elimination of amortization of prior service cost and actuarial loss amortization, which was recorded by Rockwell Collins, as a result of fair value purchase accounting, net of the impact of the revised pension and post-retirement benefit (expense) as determined under UTC’s plan assumptions. + References No definition available. + Details
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- Definition Reflects the amortization expense on the Rockwell Collins inventory step up which would be completed within the first two quarters of 2017 and eliminated the inventory step-up amortization recorded by UTC in 2018. Additionally, this adjustments reflects the amortization of the fixed asset fair value adjustment as of the acquisition date. + References No definition available. + Details
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