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Intangible Assets, Net | 3 Months Ended
--- | ---
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Net | Intangible Assets, Net Intangible assets, net of accumulated amortization, consisted of the following:
| March 31, 2024 |  | December 31, 2023
| Gross Cost |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Cost |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | $ | 291 |  |  | $ | (255) |  |  | $ | 36 |  |  | $ | 291 |  |  | $ | (250) |  |  | $ | 41 |
TiO 2 technology | 93 |  |  | (45) |  |  | 48 |  |  | 93 |  |  | (44) |  |  | 49 |
Internal-use software and other | 208 |  |  | (49) |  |  | 159 |  |  | 201 |  |  | (48) |  |  | 153 |
Intangible assets, net | $ | 592 |  |  | $ | (349) |  |  | $ | 243 |  |  | $ | 585 |  |  | $ | (342) |  |  | $ | 243 |
As of March 31, 2024 and December 31, 2023, internal-use software included approximately $131 million and $125 million, respectively, of capitalized software costs which are not being amortized as the software is not ready for its intended use. The table below summarizes amortization expense related to intangible assets for the periods presented, recorded in the specific line items in our unaudited Condensed Consolidated Statements of Operations:
| Three Months Ended March 31, |  |
| 2024 |  | 2023 |  |  |  |
Cost of goods sold | $ | 1 |  |  | $ | 1 |  |  |  |  |
Selling, general and administrative expenses | 7 |  |  | 7 |  |  |  |  |
Total | $ | 8 |  |  | $ | 8 |  |  |  |  |
Estimated future amortization expense related to intangible assets is $24 million for the remainder of 2024, $35 million for 2025, $21 million for 2026, $24 million for 2027, $23 million for 2028 and $116 million thereafter.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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