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Intangible Assets | 12 Months Ended
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Dec. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 7. Intangible Assets Intangible assets consist of the following:
| (Stated in millions) |
| 2021 |  |  | 2020 |
| Gross |  |  | Accumulated |  |  | Net Book |  |  | Gross |  |  | Accumulated |  |  | Net Book |
| Book Value |  |  | Amortization |  |  | Value |  |  | Book Value |  |  | Amortization |  |  | Value |
Customer Relationships | $ | 1,681 |  |  | $ | 551 |  |  | $ | 1,130 |  |  | $ | 1,744 |  |  | $ | 485 |  |  | $ | 1,259 |
Technology/Technical Know-How |  | 1,264 |  |  |  | 562 |  |  |  | 702 |  |  |  | 1,284 |  |  |  | 488 |  |  |  | 796 |
Tradenames |  | 766 |  |  |  | 191 |  |  |  | 575 |  |  |  | 767 |  |  |  | 166 |  |  |  | 601 |
Other |  | 1,529 |  |  |  | 725 |  |  |  | 804 |  |  |  | 1,488 |  |  |  | 689 |  |  |  | 799 |
| $ | 5,240 |  |  | $ | 2,029 |  |  | $ | 3,211 |  |  | $ | 5,283 |  |  | $ | 1,828 |  |  | $ | 3,455 |
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 $302 million in 2021, $371 million in 2020 and $618 million in 2019. Based on the carrying value of intangible assets at December 31, 2021, amortization expense for the subsequent five years is estimated to be as follows: 2022: $291 million, 2023: $281 million, 2024: $264 million, 2025: $249 million and 2026: $245 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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