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Goodwill and acquisition-related intangibles | 9 Months Ended
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Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and acquisition-related intangibles | Goodwill and acquisition-related intangibles Goodwill was $4.36 billion as of September 30, 2019 and December 31, 2018. There was no impairment of goodwill during the first nine months of 2019 or 2018. The components of acquisition-related intangibles are as follows:
|  |  | September 30, 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 |  |  | $ | 1,610 |  |  | $ | 390 |  |  | $ | 2,125 |  |  | $ | 1,573 |  |  | $ | 552 |
Customer relationships | 8 |  | — |  |  | — |  |  | — |  |  | 810 |  |  | 734 |  |  | 76 |
Total |  |  | $ | 2,000 |  |  | $ | 1,610 |  |  | $ | 390 |  |  | $ | 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 $79 million and $80 million for the third quarters of 2019 and 2018, respectively, and $238 million and $239 million for the first nine months of 2019 and 2018, respectively. Fully amortized assets are written off against accumulated amortization.

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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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