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Employee benefit obligations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Employee benefit obligations.      
Gains (losses) on Remeasurement of employee benefit benefit plans $ (3) $ (16) $ 35
Gain (loss) on remeasurement, net defined benefit liability (asset) (14) 10 $ (145)
Employee benefit obligations net of employee benefit assets 144 147  
Long term employee benefits $ 40 $ 42