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Income taxes - Income tax reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income taxes |  |  |  |  |
Income (loss) before income taxes |  |  | $ 4,969 | $ (2,775) | $ 6,816
Statutory rates (as a percent) | 20.00% | 22.00% | 34.00% |  |
Income taxes at statutory rate |  |  | $ (1,689) | 944 | (2,317)
Adjustments that affect the basis of taxes: |  |  |  |  |
Income tax benefit from interest on stockholders' equity |  |  | 316 | 601 | 873
Tax incentives |  |  | 211 | 189 | 576
Equity results |  |  | (41) | 77 | 104
Addition (reversal) of tax loss carryforward |  |  | 769 | 25 | 1,510
Unrecognized tax losses of the year |  |  | (217) | (1,059) | (458)
Others |  |  | 213 | (182) | (116)
Income taxes |  |  | $ (438) | $ 595 | $ 172

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