Table:
|  | Automotive and Discrete Group (ADG) | Microcontrollers and Digital ICs Group (MDG) | Analog, MEMS & Sensors Group AMS) | Total |
| --- | --- | --- | --- | --- |
| December 31, 2017 | — | 121 | 2 | 123 |
| Foreign currency translation | — | (2) | — | (2) |
| December 31, 2018 | — | 119 | 2 | 121 |
| Business combination | 43 | — | — | 43 |
| Foreign currency translation | — | (2) | — | (2) |
| December 31, 2019 | 43 | 117 | 2 | 162 |
Paragraphs:
As described in Note 7, the acquisition of Norstel resulted in the recognition of $43 million in goodwill which has been included in the ADG segment to align the goodwill of the acquired Company with the segment under which the related activities will be reported.
As of the end of the third quarters of 2019 and 2018, the Company performed its annual impairment test. The Company did not elect to perform a qualitative assessment. The impairment test was conducted following a two-step process. In the first step, the Company compared the fair value of the reporting units tested to their carrying value. Based upon the first step of the goodwill impairment test, no impairment was recorded since the fair value of the reporting units exceeded their carrying value.
Goodwill as at December 31, 2019 and 2018 is net of accumulated impairment losses of $102 million, of which $96 million relates to the MDG segment and $6 million to Others. In 2019, 2018 and 2017, no impairment loss was recorded by the Company.
Question:
How many million did the acquisition of Norstel contributed to goodwill?
Answer: $43 million