Quarterly Results of Operations (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Data [Abstract]
Net sales	$ 783	$ 675	$ 578	$ 722	$ 693	$ 768	$ 791	$ 390	$ 2,758	$ 2,642	$ 1,819
Cost of goods sold	605	536	449	547	545	635	672	307	2,137	2,159	1,321
Contract loss					0	0	19	0	0	19	0
Gross profit	178	139	129	175	148	133	100	83	621	464	498
Net income (loss) from continuing operations	57	902	(4)	40	(5)	(12)	(55)	(30)	995	(102)	30
Net income from discontinued operations, net of tax	0	0	0	0	0	6	(1)	0	0	5	0
Net income (loss)	57	902	(4)	40	(5)	(6)	(56)	(30)	995	(97)	30
Net income attributable to noncontrolling interest	12	6	0	8	(5)	7	6	4	26	12	37
Net (loss) income attributable to Tronox Holdings plc	$ 45	$ 896	$ (4)	$ 32	$ 0	$ (13)	$ (62)	$ (34)	$ 969	$ (109)	$ (7)
Net income (loss) per share, basic (in dollars per share)	$ 0.31	$ 6.24	$ (0.03)	$ 0.23					$ 6.76	$ (0.81)	$ (0.06)
Net income (loss) per share, diluted (in dollars per share)	$ 0.31	$ 6.18	$ (0.03)	$ 0.22					$ 6.69	$ (0.81)	$ (0.06)
Loss from continuing operations per share, basic and diluted (in dollars per share)					$ 0	$ (0.13)	$ (0.41)	$ (0.27)
Income from discontinued operations per share, basic and diluted (in dollars per share)					$ 0	$ 0.04	$ 0	$ 0
Out of Period Adjustments
Quarterly Financial Data [Abstract]
Net income from discontinued operations, net of tax						$ 7