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Intangible Assets, net
 12 Months Ended
Dec. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, net Intangible Assets, net
Intangible Assets, net of accumulated amortization, consisted of the following:
December 31, 2025December 31, 2024
Gross CostAccumulated AmortizationNet Carrying AmountGross CostAccumulated AmortizationNet Carrying Amount
Customer relationships$291 $(289)$2 $291 $(270)$21 
TiO2 technology
94 (57)37 94 (51)43 
Internal-use software and other 249 (74)175 239 (59)180 
Intangible assets, net$634 $(420)$214 $624 $(380)$244 

As of December 31, 2025 and 2024, internal-use software included approximately $55 million and $116 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 Consolidated Statements of Operations:
Year Ended December 31,
202520242023
Cost of goods sold$13 $6 $3 
Selling, general and administrative expenses27 26 28 
Total$40 $32 $31 
Estimated future amortization expense related to intangible assets is $30 million for 2026, $35 million for 2027, $34 million for 2028, $32 million for 2029, $32 million for 2030 and $51 million thereafter.