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Related parties - Key management personnel remuneration (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Short-term benefits      
Wages $ 9 $ 9 $ 12
Direct and indirect benefits 1 1 2
Profit sharing program ("PLR") 10 8 9
Total short- term benefits 20 18 23
Long-term benefits      
Shares based 12 12 8
Severance 1 7 3
Total short and long-term benefits $ 33 $ 37 $ 34