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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | Goodwill allocated to reportable segments as at December 31, 2020 and 2019 and changes in the carrying amount of goodwill during the years ended December 31, 2020 and 2019 are as follows:
|  | Automotive and Discrete Group (ADG) |  |  | Microcontrollers and Digital ICs Group (MDG) |  |  | Analog, MEMS & Sensors Group (AMS) |  |  | Total |
December 31, 2018 |  |  | — |  |  |  | 119 |  |  |  | 2 |  |  |  | 121 |
Business combination |  |  | 43 |  |  |  | — |  |  |  | — |  |  |  | 43 |
Foreign currency translation |  |  | — |  |  |  | (2 | ) |  |  | — |  |  |  | (2 | )
December 31, 2019 |  |  | 43 |  |  |  | 117 |  |  |  | 2 |  |  |  | 162 |
Business combination |  |  | 38 |  |  |  | 111 |  |  |  | — |  |  |  | 149 |
Foreign currency translation |  |  | 10 |  |  |  | 9 |  |  |  | — |  |  |  | 19 |
December 31, 2020 |  |  | 91 |  |  |  | 237 |  |  |  | 2 |  |  |  | 330 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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