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Taxes (Details 3) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Notes and other explanatory information [abstract]    
Current liabilities $ 428 $ 371
Non-current liabilities 1,723 1,869
REFIS liabilities $ 2,151 $ 2,240
SELIC rate (in percentage) 11.75% 13.75%