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Intangible Assets, net - Schedule of Intangible Assets, Net of Accumulated Amortization (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Intangible assets, net of accumulated amortization [Abstract]    
Gross Cost $ 634 $ 624
Accumulated Amortization (420) (380)
Net Carrying Amount 214 244
Customer relationships    
Intangible assets, net of accumulated amortization [Abstract]    
Gross Cost 291 291
Accumulated Amortization (289) (270)
Net Carrying Amount 2 21
TiO2 technology    
Intangible assets, net of accumulated amortization [Abstract]    
Gross Cost 94 94
Accumulated Amortization (57) (51)
Net Carrying Amount 37 43
Internal-use software and other    
Intangible assets, net of accumulated amortization [Abstract]    
Gross Cost 249 239
Accumulated Amortization (74) (59)
Net Carrying Amount $ 175 $ 180