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Employee benefits (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Employee Benefits    
Short-term employee benefits $ 1,452 $ 1,289
Termination benefits 192 349
Post-employment benefits 11,246 9,880
Total 12,890 11,518
Current 2,215 2,144
Non-current $ 10,675 $ 9,374