Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 474	$ 526	$ 1,462	$ 1,666
TiO2
Disaggregation of Revenue [Line Items]
Revenue	343	396	1,083	1,260
Color Pigments
Disaggregation of Revenue [Line Items]
Revenue	66	65	187	205
Functional Additives
Disaggregation of Revenue [Line Items]
Revenue	24	29	80	94
Timber Treatment
Disaggregation of Revenue [Line Items]
Revenue	36	31	97	91
Water Treatment
Disaggregation of Revenue [Line Items]
Revenue	5	5	15	16
Europe
Disaggregation of Revenue [Line Items]
Revenue	229	235	693	767
North America
Disaggregation of Revenue [Line Items]
Revenue	131	133	393	420
Asia
Disaggregation of Revenue [Line Items]
Revenue	84	108	270	335
Other
Disaggregation of Revenue [Line Items]
Revenue	30	50	106	144
Titanium Dioxide
Disaggregation of Revenue [Line Items]
Revenue	343	396	1,083	1,260
Titanium Dioxide | TiO2
Disaggregation of Revenue [Line Items]
Revenue	343	396	1,083	1,260
Titanium Dioxide | Color Pigments
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Titanium Dioxide | Functional Additives
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Titanium Dioxide | Timber Treatment
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Titanium Dioxide | Water Treatment
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Titanium Dioxide | Europe
Disaggregation of Revenue [Line Items]
Revenue	182	192	554	620
Titanium Dioxide | North America
Disaggregation of Revenue [Line Items]
Revenue	70	80	220	245
Titanium Dioxide | Asia
Disaggregation of Revenue [Line Items]
Revenue	64	85	212	269
Titanium Dioxide | Other
Disaggregation of Revenue [Line Items]
Revenue	27	39	97	126
Performance Additives
Disaggregation of Revenue [Line Items]
Revenue	131	130	379	406
Performance Additives | TiO2
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Performance Additives | Color Pigments
Disaggregation of Revenue [Line Items]
Revenue	66	65	187	205
Performance Additives | Functional Additives
Disaggregation of Revenue [Line Items]
Revenue	24	29	80	94
Performance Additives | Timber Treatment
Disaggregation of Revenue [Line Items]
Revenue	36	31	97	91
Performance Additives | Water Treatment
Disaggregation of Revenue [Line Items]
Revenue	5	5	15	16
Performance Additives | Europe
Disaggregation of Revenue [Line Items]
Revenue	47	43	139	147
Performance Additives | North America
Disaggregation of Revenue [Line Items]
Revenue	61	53	173	175
Performance Additives | Asia
Disaggregation of Revenue [Line Items]
Revenue	20	23	58	66
Performance Additives | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 3	$ 11	$ 9	$ 18