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Intangible Assets | 3 Months Ended
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Mar. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets | 7. Intangible Assets The gross book value, accumulated amortization and net book value of intangible assets were as follows:
| (Stated in millions) |
| Mar. 31, 2021 |  |  | Dec. 31, 2020 |
| Gross |  |  | Accumulated |  |  | Net Book |  |  | Gross |  |  | Accumulated |  |  | Net Book |
| Book Value |  |  | Amortization |  |  | Value |  |  | Book Value |  |  | Amortization |  |  | Value |
Customer relationships | $ | 1,743 |  |  | $ | 507 |  |  | $ | 1,236 |  |  | $ | 1,744 |  |  | $ | 485 |  |  | $ | 1,259 |
Technology/technical know-how |  | 1,284 |  |  |  | 514 |  |  |  | 770 |  |  |  | 1,284 |  |  |  | 488 |  |  |  | 796 |
Tradenames |  | 767 |  |  |  | 174 |  |  |  | 593 |  |  |  | 767 |  |  |  | 166 |  |  |  | 601 |
Other |  | 1,509 |  |  |  | 711 |  |  |  | 798 |  |  |  | 1,488 |  |  |  | 689 |  |  |  | 799 |
| $ | 5,303 |  |  | $ | 1,906 |  |  | $ | 3,397 |  |  | $ | 5,283 |  |  | $ | 1,828 |  |  | $ | 3,455 |
Amortization expense charged to income was $76 million during the first quarter of 2021 and $133 million during the first quarter of 2020. Based on the net book value of intangible assets at March 31, 2021, amortization charged to income for the subsequent five years is estimated to be: remaining three quarters of 2021—$228 million; 2022—$295 million; 2023—$288 million; 2024—$267 million; 2025—$255 million; and 2026—$252 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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