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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 891	$ 722
TiO2
Disaggregation of Revenue [Line Items]
Net sales	696	580
Zircon
Disaggregation of Revenue [Line Items]
Net sales	123	65
Feedstock and other products
Disaggregation of Revenue [Line Items]
Net sales	72	77
North America
Disaggregation of Revenue [Line Items]
Net sales	169	178
South and Central America
Disaggregation of Revenue [Line Items]
Net sales	63	40
Europe, Middle-East and Africa
Disaggregation of Revenue [Line Items]
Net sales	357	292
Asia Pacific
Disaggregation of Revenue [Line Items]
Net sales	$ 302	$ 212

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