Pension and Other Postretirement Healthcare Benefits - Schedule of Asset Categories and Associated Asset Allocations for Company's Funded Retirement Plans (Details)	Dec. 31, 2025	Dec. 31, 2024
U.S. operations
Pension and Other Postretirement Healthcare Benefits [Abstract]
Actual	100.00%	100.00%
Target	100.00%	100.00%
U.S. operations \| Equity securities
Pension and Other Postretirement Healthcare Benefits [Abstract]
Actual	40.00%	48.00%
Target	40.00%	48.00%
U.S. operations \| Debt securities
Pension and Other Postretirement Healthcare Benefits [Abstract]
Actual	57.00%	48.00%
Target	57.00%	48.00%
U.S. operations \| Real estate
Pension and Other Postretirement Healthcare Benefits [Abstract]
Actual	0.00%	1.00%
Target	0.00%	1.00%
U.S. operations \| Other
Pension and Other Postretirement Healthcare Benefits [Abstract]
Actual	3.00%	3.00%
Target	3.00%	3.00%
International
Pension and Other Postretirement Healthcare Benefits [Abstract]
Actual	100.00%	100.00%
Target	100.00%	100.00%
International \| Equity securities
Pension and Other Postretirement Healthcare Benefits [Abstract]
Actual	0.00%	0.00%
Target	0.00%	0.00%
International \| Debt securities
Pension and Other Postretirement Healthcare Benefits [Abstract]
Actual	0.00%	38.00%
Target	0.00%	38.00%
International \| Real estate
Pension and Other Postretirement Healthcare Benefits [Abstract]
Actual	0.00%	0.00%
Target	0.00%	0.00%
International \| Other
Pension and Other Postretirement Healthcare Benefits [Abstract]
Actual	100.00%	62.00%
Target	100.00%	62.00%

Tronox Holdings plc 10-K