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Employee benefits (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Notes and other explanatory information [abstract]    
Short-term employee benefits $ 1,387 $ 1,452
Termination benefits 167 192
Post-employment benefits 12,620 11,246
Total 14,174 12,890
Current 2,198 2,215
Non-current $ 11,976 $ 10,675