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Taxes (Details 2) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Notes and other explanatory information [abstract]    
Current liabilities $ 383 $ 428
Non-current liabilities 1,284 1,723
REFIS liabilities $ 1,667 $ 2,151
SELIC rate (in percentage) 10.50% 11.75%