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Accumulated Other Comprehensive Loss Attributable to Tronox Holdings plc and Other Equity Items - Schedule of Changes in Accumulated Other Comprehensive Loss by Component (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 1,791 $ 1,980 $ 2,403
Ending balance 1,449 1,791 1,980
AOCI Attributable to Parent      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (880) (814) (768)
Other comprehensive income (loss) 167 (62) (48)
Amounts reclassified from accumulated other comprehensive loss (4) (4) 2
Ending balance (717) (880) (814)
Cumulative Translation Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (801) (729) (710)
Other comprehensive income (loss) 174 (72) (19)
Amounts reclassified from accumulated other comprehensive loss 0 0 0
Ending balance (627) (801) (729)
Pension Liability Adjustment      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (84) (92) (78)
Other comprehensive income (loss) 0 7 (14)
Amounts reclassified from accumulated other comprehensive loss 1 1 0
Ending balance (83) (84) (92)
Unrealized Gains (losses) on Derivatives      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 5 7 20
Other comprehensive income (loss) (7) 3 (15)
Amounts reclassified from accumulated other comprehensive loss (5) (5) 2
Ending balance $ (7) $ 5 $ 7