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Employee benefits (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liabilities      
Short-term employee benefits $ 1,986 $ 1,452  
Termination benefits 143 192 $ 349
Post-employment benefits 16,382 11,246  
Total 18,511 12,890  
Current 2,932 2,215  
Non-current $ 15,579 $ 10,675