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Intangible Assets, Net | 3 Months Ended
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Mar. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets, Net | Intangible Assets, Net Intangible assets, net of accumulated amortization, consisted of the following:
| March 31, 2021 |  | December 31, 2020
| Gross Cost |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Cost |  | Accumulated Amortization |  | Net Carrying Amount
Customer relationships | $ | 291 |  |  | $ | (197) |  |  | $ | 94 |  |  | $ | 291 |  |  | $ | (193) |  |  | $ | 98 |
TiO 2 technology | 93 |  |  | (26) |  |  | 67 |  |  | 93 |  |  | (24) |  |  | 69 |
Internal-use software and other | 81 |  |  | (41) |  |  | 40 |  |  | 73 |  |  | (39) |  |  | 34 |
Intangible assets, net | $ | 465 |  |  | $ | (264) |  |  | $ | 201 |  |  | $ | 457 |  |  | $ | (256) |  |  | $ | 201 |
As of March 31, 2021 and December 31, 2020, internal-use software included approximately $29 million and $19 million, respectively, of capitalized software costs which are not being amortized as the software is not ready for its intended use. Amortization expense related to intangible assets recorded in "Selling, general and administrative expenses" in the unaudited Condensed Consolidated Statements of Income was $8 million and $9 million during the three months ended March 31, 2021 and 2020, respectively. Estimated future amortization expense related to intangible assets is $24 million for the remainder of 2021, $33 million for 2022, $33 million for 2023, $36 million for 2024, $33 million for 2025 and $42 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://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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