| Intangible Assets Intangible assets consisted of the following:
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, 2024 | | December 31, 2023 | | (In millions) | Estimated Useful Life | Estimated Weighted Average Remaining Useful Life (years) | Gross Intangibles | | Accumulated Amortization | | Net Intangibles | | Gross Intangibles | | Accumulated Amortization | | Net Intangibles | | Definite-Lived: | | | | | | | | | | | | | | | Developed technology | 10-12 years | 3 | $ | 33 | | | $ | (33) | | | $ | — | | | $ | 40 | | | $ | (39) | | | $ | 1 | | | Customer related | 8-16 years | 15 | 43 | | | (9) | | | 34 | | | 86 | | | (83) | | | 3 | | | Capitalized software development | 5 years | 3 | 55 | | | (31) | | | 24 | | | 52 | | | (24) | | | 28 | | | Tradename | 10 years | 10 | 2 | | | — | | | 2 | | | — | | | — | | | — | | | Other | 2-32 years | 11 | 26 | | | (15) | | | 11 | | | 26 | | | (12) | | | 14 | | | Subtotal | | | 159 | | | (88) | | | 71 | | | 204 | | | (158) | | | 46 | | | Indefinite-Lived: | | | | | | | | | | | | | | | Goodwill | | | 81 | | | — | | | 81 | | | 44 | | | — | | | 44 | | | Total | | | $ | 240 | | | $ | (88) | | | $ | 152 | | | $ | 248 | | | $ | (158) | | | $ | 90 | |
Capitalized software development consists of software development costs intended for integration into customer products.
Goodwill as of December 31, 2024 consisted of the following:
| | | | | | | (In millions) | | | December 31, 2021 | $ | 50 | | | Foreign currency | (5) | | | December 31, 2022 | $ | 45 | | | Foreign currency | (1) | | | December 31, 2023 | $ | 44 | | | Additions | 39 | | | Foreign currency | (2) | | | December 31, 2024 | $ | 81 | |
The Company recorded amortization expense of approximately $12 million, $19 million, and $18 million for the years ended December 31, 2024, 2023, and 2022, respectively, related to definite-lived intangible assets. The Company currently estimates annual amortization expense to be as follows: | | | | | | | (In millions) | | | 2025 | $ | 15 | | | 2026 | 13 | | | 2027 | 9 | | | 2028 | 4 | | | 2029 | 4 | | | |
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