Taxes (Details 2) - USD ($) $ in Millions |
6 Months Ended | 12 Months Ended |
|---|---|---|
Jun. 30, 2025 |
Dec. 31, 2024 |
|
| Notes and other explanatory information [abstract] | ||
| Current liabilities | $ 412 | $ 353 |
| Non-current liabilities | 971 | 1,007 |
| REFIS liabilities | $ 1,383 | $ 1,360 |
| SELIC rate (in percentage) | 15.00% | 12.25% |