Goodwill and acquisition-related intangibles
Goodwill by segment as of December 31, 2020 and 2019, is as follows:
Goodwill
Analog$4,158 
Embedded Processing172 
Other32 
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 2020, 2019 and 2018, we determined no impairment was indicated.
The components of acquisition-related intangibles are as follows:
December 31, 2020
December 31, 2019
Amortization Period (Years)Gross Carrying AmountAccumulated AmortizationNetGross Carrying AmountAccumulated AmortizationNet
Developed technology
8 10
$1,895 $1,753 $142 $2,000 $1,660 $340 
Other intangibles510  10 — — — 
Total$1,905 $1,753 $152 $2,000 $1,660 $340 
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 $198 million, $288 million and $318 million in 2020, 2019 and 2018, respectively. Fully amortized assets are written off against accumulated amortization. The remaining estimated amortization is $144 million in 2021.

Historical Timeline

Fiscal YearFiled
2020Feb 5, 2021Showing above
2019Feb 20, 2020
2017Feb 22, 2018

About Goodwill & Intangibles Disclosures

Goodwill and intangible asset disclosures reveal the premium paid in acquisitions and how management assesses whether that premium retains its value. Since goodwill is no longer amortized under US GAAP, the annual impairment test is the only mechanism that adjusts carrying values downward — making the assumptions behind that test critically important for investors.

Key signals: a history of goodwill impairments suggests management consistently overpays for acquisitions. Watch the gap between reporting unit fair value and carrying amount — when fair value exceeds carrying amount by less than 10-20%, a small decline in business performance could trigger a write-down. For finite-lived intangibles, examine useful life assumptions across customer relationships, technology, and trade names; aggressive estimates inflate near-term earnings. Compare total intangibles-to-total-assets ratios against peers to assess acquisition dependency. Rising goodwill as a percentage of equity can signal balance sheet fragility.