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Employee benefits (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Liabilities    
Short-term employee benefits $ 1,418 $ 1,986
Termination benefits 102 143
Post-employment benefits 14,620 16,382
Total 16,140 18,511
Current 2,299 2,932
Non-current $ 13,841 $ 15,579