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Intangible Assets, net
12 Months Ended
Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets, net Intangible Assets, net
Intangible Assets, net of accumulated amortization, consisted of the following:
December 31, 2022December 31, 2021
Gross CostAccumulated AmortizationNet Carrying AmountGross CostAccumulated AmortizationNet Carrying Amount
Customer relationships$291 $(231)$60 $291 $(211)$80 
TiO2 technology
93 (37)56 93 (31)62 
Internal-use software and other 179 (45)134 120 (45)75 
Intangible assets, net$563 $(313)$250 $504 $(287)$217 

As of December 31, 2022 and 2021, internal-use software included approximately $106 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 Consolidated Statements of Income:
Year Ended December 31,
202220212020
Cost of goods sold$$$
Selling, general and administrative expenses29 31 31 
Total$31 $33 $33 
Estimated future amortization expense related to intangible assets is $28 million for 2023, $36 million for 2024, $39 million for 2025, $21 million for 2026, $19 million for 2027 and $107 million thereafter.