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Income taxes - Income tax reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income taxes |  |  |  |
Income before income taxes | $ 9,610 | $ 1,064 | $ 16,897 | $ 576
Income taxes at statutory rate (as a percent) | 34.00% | 34.00% | 34.00% | 34.00%
Income taxes at statutory rate | $ (3,267) | $ (362) | $ (5,745) | $ (196)
Adjustments that affect the basis of taxes: |  |  |  |
Tax incentives | 1,163 | 179 | 1,618 | 489
Equity results | 36 | 14 | 26 | (23)
Addition (reversal) of tax loss carryforward | (63) | 22 | (109) | 448
Others | 58 | 2 | 327 | (214)
Income taxes | $ (2,073) | $ (145) | $ (3,883) | $ 504

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