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Critical and Significant Accounting Policies - Rev Recognition (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) segment contract | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Revenue, Performance Obligation [Abstract] |  |  |
Revenue, Practical Expedient, Initial Application and Transition, Nondisclosure of Transaction Price Allocation to Remaining Performance Obligation [true false] | true |  |
Revenue Recognition in the Aerospace and Technologies Segment |  |  |
Revenue, Practical Expedient, Financing Component [true false] | true |  |
Number of reportable segments | segment | 4 |  |
Research and Development Costs |  |  |
Research and development expenses | $ | $ 44 | $ 32 | $ 27
Aerospace |  |  |
Revenue Recognition in the Aerospace and Technologies Segment |  |  |
Number of types of long-term sales contracts utilized | contract | 2 |  |
Maximum |  |  |
Revenue, Performance Obligation [Abstract] |  |  |
Payment term | 1 year |  |
Maximum | Aerospace |  |  |
Revenue, Performance Obligation [Abstract] |  |  |
Payment term | 1 year |  |

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- Definition Length of payment terms of sales contracts in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 + Details
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- Definition Indicates (true false) whether practical expedient was elected not to adjust consideration for effect of financing component when transfer and customer payment for product or service occurs within one year or less. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130569-203045 + Details
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- Definition Indicates (true false) whether practical expedient was elected not to disclose amount of transaction price allocated to remaining performance obligation and explanation of expected timing of revenue recognition for reporting period presented prior to date of initial application under retrospective method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 65 -Paragraph 1 -Subparagraph (f)(3) -URI http://asc.fasb.org/extlink&oid=113356391&loc=SL49131195-203048 + Details
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