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Financial assets and liabilities - Hierarchy of fair value (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
Financial instruments classification |  |
Financial assets | $ 5,158 | $ 5,207
Financial liabilities | 5,962 | 5,307
Transfers out of Level 1 into Level 2 of fair value hierarchy, assets held at end of reporting period | 0 |
Transfers out of Level 1 into Level 2 of fair value hierarchy, liabilities held at end of reporting period | 0 |
Transfers out of Level 2 into Level 1 of fair value hierarchy, assets held at end of reporting period | 0 |
Transfers out of Level 2 into Level 1 of fair value hierarchy, liabilities held at end of reporting period | 0 |
Transfers out of Level 3 of fair value hierarchy, assets | 0 |
Transfers out of Level 3 of fair value hierarchy, liabilities | 0 |
Level 1 |  |
Financial instruments classification |  |
Financial assets | 2,048 | 1,528
Level 2 |  |
Financial instruments classification |  |
Financial assets | 3,095 | 3,661
Financial liabilities | 5,956 | 5,288
Level 3 |  |
Financial instruments classification |  |
Financial assets | 15 | 18
Financial liabilities | 6 | 19
Derivatives |  |
Financial instruments classification |  |
Financial liabilities | 725 | 1,017
Derivatives | Level 2 |  |
Financial instruments classification |  |
Financial liabilities | 719 | 998
Derivatives | Level 3 |  |
Financial instruments classification |  |
Financial liabilities | 6 | 19
Participative stockholders' debentures |  |
Financial instruments classification |  |
Financial liabilities | 4,687 | 3,413
Participative stockholders' debentures | Level 2 |  |
Financial instruments classification |  |
Financial liabilities | 4,687 | 3,413
Financial guarantees |  |
Financial instruments classification |  |
Financial liabilities | 550 | 877
Financial guarantees | Level 2 |  |
Financial instruments classification |  |
Financial liabilities | 550 | 877
Short-term investments |  |
Financial instruments classification |  |
Financial assets | 951 | 771
Short-term investments | Level 1 |  |
Financial instruments classification |  |
Financial assets | 951 | 771
Accounts receivable |  |
Financial instruments classification |  |
Financial assets | 2,688 | 3,479
Accounts receivable | Level 2 |  |
Financial instruments classification |  |
Financial assets | 2,688 | 3,479
Derivatives |  |
Financial instruments classification |  |
Financial assets | 422 | 200
Derivatives | Level 2 |  |
Financial instruments classification |  |
Financial assets | 407 | 182
Derivatives | Level 3 |  |
Financial instruments classification |  |
Financial assets | 15 | 18
Investments in equity securities |  |
Financial instruments classification |  |
Financial assets | 1,097 | 757
Investments in equity securities | Level 1 |  |
Financial instruments classification |  |
Financial assets | $ 1,097 | $ 757

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