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Loans, borrowings, cash and cash equivalents and short-term investments (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Notes and other explanatory information [abstract]        
Loans and borrowings $ 14,792 $ 12,471    
Leases 713 1,452    
Gross debt 15,505 13,923    
Cash and cash equivalents 4,953 3,609 $ 4,736 $ 11,721
Short-term investments 53 51    
Net Cash PTVI 703    
Net debt $ 10,499 $ 9,560