Suppliers and contractors (Details 1) - USD ($) $ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Notes and other explanatory information [abstract] | ||
| Carrying amount of accounts payable included in the Arrangements of which suppliers have already received payment | $ 1,371 | $ 1,343 |
| Carrying amount of accounts payable included in the Arrangements of which suppliers have not yet received payment | 6 | |
| Total carrying amount relating to Arrangements with suppliers and contractors | $ 1,371 | $ 1,349 |