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Goodwill and Other Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Other Intangibles | GOODWILL AND OTHER INTANGIBLE ASSETS We completed our annual impairment tests of goodwill in 2020 and 2019 and concluded in each year that no impairments exist.
Summary of Other Intangible Assets
| Weighted Average Amortization Period (Years) | Gross Carrying Amount | Less Accumulated Amortization | Net Carrying Amount
Developed technologies
2020 | 13 | $ | 5,305 |  | $ | 1,573 |  | $ | 3,732 |
2019 | 14 | 3,731 |  | 1,271 |  | 2,460 |
Customer relationships
2020 | 15 | $ | 2,352 |  | $ | 988 |  | $ | 1,364 |
2019 | 16 | 2,160 |  | 848 |  | 1,312 |
Patents
2020 | 12 | $ | 346 |  | $ | 278 |  | $ | 68 |
2019 | 11 | 348 |  | 265 |  | 83 |
Trademarks
2020 | 17 | $ | 428 |  | $ | 162 |  | $ | 266 |
2019 | 18 | 362 |  | 136 |  | 226 |
In-process research and development
2020 | N/A | $ | 97 |  | $ | — |  | $ | 97 |
2019 | N/A | 110 |  | — |  | 110 |
Other
2020 | 8 | $ | 128 |  | $ | 101 |  | $ | 27 |
2019 | 8 | 125 |  | 89 |  | 36 |
Total
2020 | 14 | $ | 8,656 |  | $ | 3,102 |  | $ | 5,554 |
2019 | 14 | 6,836 |  | 2,609 |  | 4,227 |
Changes in the Net Carrying Value of Goodwill by Segment
| Orthopaedics | MedSurg | Neurotechnology and Spine | Total
2018 | $ | 2,399 |  | $ | 3,581 |  | $ | 2,583 |  | $ | 8,563 |
Additions and adjustments | — |  | 229 |  | 318 |  | 547 |
Foreign exchange | (13) |  | (11) |  | (17) |  | (41) |
2019 | $ | 2,386 |  | $ | 3,799 |  | $ | 2,884 |  | $ | 9,069 |
Additions and adjustments | 3,551 |  | 1 |  | 7 |  | 3,559 |
Foreign exchange | 67 |  | 31 |  | 52 |  | 150 |
2020 | $ | 6,004 |  | $ | 3,831 |  | $ | 2,943 |  | $ | 12,778 |
Estimated Amortization Expense
2021 | 2022 | 2023 | 2024 | 2025
$ | 600 |  | $ | 588 |  | $ | 567 |  | $ | 540 |  | $ | 518 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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