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Loans, borrowings, cash and cash equivalents and short-term investments (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Notes and other explanatory information [abstract]        
Loans and borrowings $ 12,471 $ 11,181    
Leases 1,452 1,531    
Gross debt 13,923 12,712    
Cash and cash equivalents 3,609 4,736 $ 11,721 $ 13,487
Short-term investments 51 61    
Net Cash PTVI 703    
Net debt $ 9,560 $ 7,915