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Intangible Assets, Net
3 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, Net Intangible Assets, Net
Intangible assets, net of accumulated amortization, consisted of the following:
March 31, 2022December 31, 2021
Gross CostAccumulated
Amortization
Net Carrying
Amount
Gross CostAccumulated
Amortization
Net Carrying
Amount
Customer relationships$291 $(216)$75 $291 $(211)$80 
TiO2 technology
93 (32)61 93 (31)62 
Internal-use software and other136 (43)93 120 (45)75 
Intangible assets, net$520 $(291)$229 $504 $(287)$217 
As of March 31, 2022 and December 31, 2021, internal-use software included approximately $89 million and $68 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 Income:
Three Months Ended March 31,
20222021
Selling, general and administrative expenses
Total$$
Estimated future amortization expense related to intangible assets is $26 million for the remainder of 2022, $36 million for 2023, $35 million for 2024, $35 million for 2025, $17 million for 2026 and $80 million thereafter.