RESTRUCTURING, IMPAIRMENT AND PLANT CLOSING AND TRANSITION COSTS - CASH AND NONCASH RESTRUCTURING CHARGES AND OTHER INFORMATION (Details) $ in Millions		3 Months Ended								12 Months Ended
	Feb. 15, 2015 kt	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 position
Restructuring, impairment and plant closing costs
Restructuring charges											$ 45	$ 25	$ 113
Pension-related charges													3
Accelerated depreciation											3	8	68
Impairment of assets											3	1	19
Other non-cash charges											1	1	17
Total restructuring, impairment and plant closing and Transition costs		$ 3	$ 16	$ 7	$ 26	$ 4	$ 7	$ 13	$ 11		52	35	220
St. Louis And Easton
Restructuring, impairment and plant closing costs
Restructuring charges											7
Accelerated depreciation											3
St. Louis And Easton | Forecast
Restructuring, impairment and plant closing costs
Other non-cash charges										$ 1
Additional restructuring charges remaining										$ 21
Titanium Dioxide And Performance Additives
Restructuring, impairment and plant closing costs
Pension-related charges													3
Titanium Dioxide | Calais, France
Restructuring, impairment and plant closing costs
Restructuring charges											34	1
Accelerated depreciation												8	68
Other non-cash charges													17
Decrease in titanium dioxide capacity due to closing operations | kt	100
Decrease in titanium dioxide capacity due to closing operations (as a percent)	11.00%
Additional restructuring charges remaining		44									44
Titanium Dioxide | South Africa
Restructuring, impairment and plant closing costs
Restructuring charges											4	6
Impairment of assets												1	19
Additional restructuring charges remaining		$ 11									$ 11
Workforce reductions
Restructuring, impairment and plant closing costs
Number of positions terminated | item											205
Workforce reductions | Calais, France
Restructuring, impairment and plant closing costs
Restructuring charges													30
Workforce reductions | Titanium Dioxide And Performance Additives
Restructuring, impairment and plant closing costs
Restructuring charges												$ 3	61
Number of positions terminated | position														900
Other restructuring costs | Titanium Dioxide And Performance Additives
Restructuring, impairment and plant closing costs
Restructuring charges													$ 15