v3.25.4
Tax provision - Deferred income tax liabilities (assets) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) $ 391 $ 602
Deferred tax assets (6) (7)
Deferred tax liabilities 397 609
Net operating losses 111 95
Net operating losses, not yet recognized 22 30
Capital losses, not yet recognized 111 95
Federal    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Net operating losses 724 304
State    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Net operating losses 349 227
Net operating losses, not yet recognized 211 205
Property, Plant And Equipment And Intangibles    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) 599 681
Reforestation And Decommissioning Obligations    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) (34) (27)
Employee Benefits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) (29) (25)
Export Duty Deposits    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) 79 93
Tax loss carry-forwards    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) (176) (70)
Inventory    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) (19) (16)
Other temporary differences    
Disclosure of temporary difference, unused tax losses and unused tax credits [line items]    
Deferred tax liability (asset) $ (29) $ (34)