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Intangible Assets | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 8. Intangible Assets Intangible assets consist of the following:
| (Stated in millions) |
| 2020 |  |  | 2019 |
| Gross |  |  | Accumulated |  |  | Net Book |  |  | Gross |  |  | Accumulated |  |  | Net Book |
| Book Value |  |  | Amortization |  |  | Value |  |  | Book Value |  |  | Amortization |  |  | Value |
Customer Relationships | $ | 1,744 |  |  | $ | 485 |  |  | $ | 1,259 |  |  | $ | 3,779 |  |  | $ | 868 |  |  | $ | 2,911 |
Technology/Technical Know-How |  | 1,284 |  |  |  | 488 |  |  |  | 796 |  |  |  | 2,498 |  |  |  | 779 |  |  |  | 1,719 |
Tradenames |  | 767 |  |  |  | 166 |  |  |  | 601 |  |  |  | 1,885 |  |  |  | 264 |  |  |  | 1,621 |
Other |  | 1,488 |  |  |  | 689 |  |  |  | 799 |  |  |  | 1,514 |  |  |  | 676 |  |  |  | 838 |
| $ | 5,283 |  |  | $ | 1,828 |  |  | $ | 3,455 |  |  | $ | 9,676 |  |  | $ | 2,587 |  |  | $ | 7,089 |
Customer relationships are generally amortized over periods ranging from 18 to 28 years, technology/technical know-how are generally amortized over periods ranging from 10 to 18 years, and tradenames are generally amortized over periods ranging from 15 to 30 years. Amortization expense was $371 million in 2020, $618 million in 2019 and $673 million in 2018. Based on the carrying value of intangible assets at December 31, 2020, amortization expense for the subsequent five years is estimated to be as follows: 2021: $307 million, 2022: $304 million, 2023: $293 million, 2024: $269 million and 2025: $259 million.

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- Definition The entire disclosure for all or part of the information related to 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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