Net Sales - Summary of Disaggregation of Net Sales by Geographical Region and Segment and Product Group (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	$ 1,381	$ 1,368
Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	11	11
Transferred at a Point in Time [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	1,381	1,368
Transferred at a Point in Time [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	559	597
Transferred at a Point in Time [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	568	466
Transferred at a Point in Time [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	243	294
Transferred at a Point in Time [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	11	11
Transferred at a Point in Time [Member] \| North America [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	663	619
Transferred at a Point in Time [Member] \| North America [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	235	267
Transferred at a Point in Time [Member] \| North America [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	326	233
Transferred at a Point in Time [Member] \| North America [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	7	12
Transferred at a Point in Time [Member] \| North America [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	7	8
Transferred at a Point in Time [Member] \| Asia Pacific [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	239	275
Transferred at a Point in Time [Member] \| Asia Pacific [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	77	105
Transferred at a Point in Time [Member] \| Asia Pacific [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	71	53
Transferred at a Point in Time [Member] \| Asia Pacific [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	89	115
Transferred at a Point in Time [Member] \| Asia Pacific [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	2	1
Transferred at a Point in Time [Member] \| Europe, the Middle East, and Africa [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	302	297
Transferred at a Point in Time [Member] \| Europe, the Middle East, and Africa [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	151	142
Transferred at a Point in Time [Member] \| Europe, the Middle East, and Africa [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	74	82
Transferred at a Point in Time [Member] \| Europe, the Middle East, and Africa [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	52	56
Transferred at a Point in Time [Member] \| Europe, the Middle East, and Africa [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	2	2
Transferred at a Point in Time [Member] \| Latin America [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	177	177
Transferred at a Point in Time [Member] \| Latin America [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	96	83
Transferred at a Point in Time [Member] \| Latin America [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	97	98
Transferred at a Point in Time [Member] \| Latin America [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	95	111
Transferred at a Point in Time [Member] \| Latin America [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	0	0
Transferred at a Point in Time [Member] \| Titanium Dioxide and Other Minerals [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	541	575
Transferred at a Point in Time [Member] \| Minerals And Other [Member] \| Titanium Technologies [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	18	22
Transferred at a Point in Time [Member] \| Opteon Refrigerants [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	313	279
Transferred at a Point in Time [Member] \| Freon Refrigerants [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	162	97
Transferred at a Point in Time [Member] \| Foam, Propellants, and Other [Member] \| Thermal & Specialized Solutions [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	93	90
Transferred at a Point in Time [Member] \| Advanced Materials [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	143	178
Transferred at a Point in Time [Member] \| Performance Solutions [Member] \| Advanced Performance Materials [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	100	116
Transferred at a Point in Time [Member] \| Performance Chemicals and Intermediates [Member] \| Other Non-Reportable Segment [Member]
Disaggregation Of Revenue [Line Items]
Disaggregation of Net Sales	$ 11	$ 11