Export duties, net, and tariffs - Impact on balance sheet (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Export Duty Deposits Receivable [Roll Forward] | ||
| Beginning of year | $ 408 | $ 377 |
| Export duties receivable on adjustments to West Fraser rates1 | 32 | 6 |
| Export duty deposit receivable on adjustment to finalized rates | 377 | |
| Interest Income On Duty Deposits Receivable | 34 | 25 |
| End of year | 474 | 408 |
| Export Duties Payable [Roll Forward] | ||
| Beginning of year | 46 | 24 |
| Export duties payable on adjustments to West Fraser rates1 | (92) | (15) |
| Interest Income On Duty Deposits Payable | 29 | 6 |
| End of year | $ 166 | $ 46 |