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Loans, borrowings, cash and cash equivalents and short-term investments (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2022
Notes and other explanatory information [abstract]        
Loans and borrowings $ 13,770 $ 12,471    
Leases 1,360 1,452    
Gross debt 15,130 13,923    
Cash and cash equivalents 6,479 3,609 $ 4,983 $ 4,736
Short-term investments 61 51    
Net Cash PTVI 703    
Net debt $ 8,590 $ 9,560