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Restructuring and Other Exit Costs - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 02, 2020 | Jul. 03, 2020 | Sep. 27, 2019 | Oct. 02, 2020 | Sep. 27, 2019 | Jan. 03, 2020 | Jun. 28, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  | $ 24 |  |  |
Restructuring liabilities | $ 40 |  |  | 40 |  | $ 65 |
COVID-19-Related Restructuring Costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring liabilities | 10 |  |  | 10 |  |  |
COVID-19-Related Restructuring Costs | Aviation Systems |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 2 |  |  | 16 |  |  |
COVID-19-Related Restructuring Costs | Communication Systems |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  | $ 1 |  |  |  |  |
Other Restructuring and Exit Costs |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges |  |  |  | 0 |  |  |
Restructuring liabilities | 6 |  |  | 6 |  | $ 7 |
Remaining lease term (less than) |  |  |  |  |  |  | 3 years
L3Harris |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |
Restructuring charges | 0 | $ 7 | $ 111 | 7 | $ 111 |  |
Restructuring liabilities | $ 24 |  |  | $ 24 |  |  |

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- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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