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Goodwill and Acquisition-Related Intangibles | 12 Months Ended
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Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and acquisition-related intangibles | Goodwill and acquisition-related intangibles Goodwill by segment as of December 31, 2019 and 2018, is as follows:
| Goodwill
Analog | $ | 4,158 |
Embedded Processing | 172 |
Other | 32 |
Total | $ | 4,362 |
We perform our annual goodwill impairment test as of October 1 and determine whether the fair value of each of our reporting units is in excess of its carrying value. Determination of fair value is based upon management estimates and judgment, using unobservable inputs in discounted cash flow models to calculate the fair value of each reporting unit. These unobservable inputs are considered Level 3 measurements, as described in Note 6. In 2019, 2018 and 2017, we determined no impairment was indicated. The components of acquisition-related intangibles are as follows:
|  |  | December 31, 2019 |  |  |  |  |  | December 31, 2018 |  |  |  |
| Amortization Period (Years) |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net
Developed technology | 7 – 10 |  | $ | 2,000 |  |  | $ | 1,660 |  |  | $ | 340 |  |  | $ | 2,125 |  |  | $ | 1,573 |  |  | $ | 552 |
Customer relationships | 8 |  | — |  |  | — |  |  | — |  |  | 810 |  |  | 734 |  |  | 76 |
Total |  |  | $ | 2,000 |  |  | $ | 1,660 |  |  | $ | 340 |  |  | $ | 2,935 |  |  | $ | 2,307 |  |  | $ | 628 |
Acquisition charges Acquisition charges represent the ongoing amortization of intangible assets resulting from the acquisition of National Semiconductor Corporation. These amounts are included in Other for segment reporting purposes, consistent with how management measures the performance of its segments. Amortization of acquisition-related intangibles was $288 million in 2019 and $318 million in 2018 and 2017. Fully amortized assets are written off against accumulated amortization. The remaining estimated amortization is $198 million in 2020 and $142 million in 2021.

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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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