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Goodwill and Other Intangible Assets - Intangibles Assets (Details) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 02, 2020 USD ($) | Sep. 27, 2019 USD ($) | Oct. 02, 2020 USD ($) divestiture | Sep. 27, 2019 USD ($) | Jan. 03, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | $ 7,754 |  | $ 7,754 |  | $ 7,461
Accumulated Amortization | 1,406 |  | 1,406 |  | 875
Net Carrying Amount | 6,348 |  | 6,348 |  | 6,586
Total intangibles assets, Gross Carrying Amount | 9,578 |  | 9,578 |  | 9,333
Total identifiable intangible assets | 8,172 |  | 8,172 |  | 8,458
Intangible assets derecognized as part of the gain on sale of businesses | 10 | $ (229) | $ 62 | $ (229) |
Disposal Group, Disposed of by Sale, Not Discontinued Operations |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Number of businesses divestitures | divestiture |  |  | 3 |  |
Intangible assets derecognized as part of the gain on sale of businesses |  |  | $ 296 |  |
Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangibles reclassified as assets of disposal group held for sale | 5 |  | 5 |  |
In-process research and development |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived Intangibles | 21 |  | 21 |  | 69
L3 trade name |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Indefinite-lived Intangibles | 1,803 |  | 1,803 |  | 1,803
Customer relationships |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 6,923 |  | 6,923 |  | 6,518
Accumulated Amortization | 1,103 |  | 1,103 |  | 653
Net Carrying Amount | 5,820 |  | 5,820 |  | 5,865
Developed technologies |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 670 |  | 670 |  | 768
Accumulated Amortization | 242 |  | 242 |  | 183
Net Carrying Amount | 428 |  | 428 |  | 585
Contract backlog |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 19 |  | 19 |  | 0
Accumulated Amortization | 15 |  | 15 |  | 0
Net Carrying Amount | 4 |  | 4 |  | 0
L3 trade name |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 138 |  | 138 |  | 165
Accumulated Amortization | 43 |  | 43 |  | 35
Net Carrying Amount | 95 |  | 95 |  | 130
Other |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Gross Carrying Amount | 4 |  | 4 |  | 10
Accumulated Amortization | 3 |  | 3 |  | 4
Net Carrying Amount | $ 1 |  | $ 1 |  | $ 6

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