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Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 03, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Net pre-tax restructuring costs |  | $ 250 |  |  |  |  | $ 685 |  |
Goodwill, Impairment Loss |  | 0 |  | $ 0 |  |  | 3,183 | $ 0 |
Estimated credit losses |  | 48 |  |  |  |  | 357 |  |
Operating Income (Loss) |  | 434 |  | 1,430 |  |  | (2,031) | 3,958 |
Income (loss) from continuing operations attributable to common shareowners |  | $ 151 |  | $ 958 |  |  | $ (3,255) | $ 2,853 |
Income (loss) from continuing operations |  | $ 0.10 |  | $ 1.11 |  |  | $ (2.48) | $ 3.31 |
Contract with Customer, Performance Obligation Satisfied in Previous Period |  | $ (231) |  | $ 1 |  |  | $ (432) | $ (114) |
Capitalized Contract Cost, Gross |  | $ 1,912 |  |  | $ 1,912 |  | $ 1,912 |  | $ 1,519
Collaborators Interests Existing Programs Low End |  | 13.00% |  |  | 13.00% |  | 13.00% |  |
Collaborators Interests Existing Programs High End |  | 49.00% |  |  | 49.00% |  | 49.00% |  |
Partner share individual program maximum |  | 31.00% |  |  | 31.00% |  | 31.00% |  |
Revenue, Remaining Performance Obligation, Amount |  | $ 152,300 |  |  | $ 152,300 |  | $ 152,300 |  |
Revenue, Remaining Performance Obligations, to be recognized within 24 months |  | 30.00% |  |  | 30.00% |  | 30.00% |  |
ASU 2016-13 [Member] |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  |  |  |  |  |  | $ 59 |  |
Collins Aerospace Systems [Member] |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Net pre-tax restructuring costs |  | $ 138 |  |  |  |  | 295 |  |
Goodwill, Impairment Loss |  |  | $ 3,200 |  |  |  | 3,183 |  |
Contract asset and inventory write-offs |  | 13 |  |  |  |  | 146 |  |
Operating Income (Loss) |  | 526 |  | 1,259 |  |  | 1,455 | 3,499 |
Collins Aerospace Systems [Member] | Patents and trademarks [Member] |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Asset Impairment Charges |  |  |  |  |  | $ 57 |  |  |
Pratt & Whitney [Member] |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Net pre-tax restructuring costs |  | 68 |  |  |  |  | 175 |  |
Goodwill, Impairment Loss |  |  |  |  |  |  | 0 |  |
Unfavorable EAC adjustment on a commercial engine aftermarket contract |  | 334 |  |  |  |  | 334 |  |
Unfavorable EAC adjustment related to the restructuring of a customer contract |  | 129 |  |  |  |  | 129 |  |
Asset Impairment Charges |  | 89 |  |  |  |  | 89 |  |
Unfavorable EAC adjustments on commercial aftermarket contracts |  |  |  |  | $ 48 |  |  |  |
Unfavorable EAC adjustment related to military contracts |  |  | $ 44 |  |  |  |  |  |
Operating Income (Loss) |  | (615) |  | 520 |  |  | $ (597) | 1,447 |
Otis [Member] |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Shares of common stock distributed in the Distribution | 433,079,455 |  |  |  |  |  |  |  |
Carrier [Member] |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Shares of common stock distributed in the Distribution | 866,158,910 |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Operating Cycle |  |  |  |  |  |  | one year |  |
Contracts Accounted for under Percentage of Completion [Member] |  |  |  |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |  |  |  |
Operating Income (Loss) |  | (462) |  | 4 |  |  | $ (592) | (77) |
Income (loss) from continuing operations attributable to common shareowners |  | $ (365) |  | $ 3 |  |  | $ (468) | $ (61) |
Income (loss) from continuing operations |  | $ (0.24) |  | $ 0 |  |  | $ (0.36) | $ (0.07) |

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