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Taxes - Effective tax rate (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Taxes |  |  |  |  |
Effective tax rate (as a percent) |  | 22.20% | 30.10% | 66.50% | 34.40%
Impairment on disposition of assets | $ (20) | $ (20) |  | $ 340 |
Income tax expense (benefit) with respect to impairment |  | $ 0 |  | 0 |
Tax benefit due to reversal of accrual for withholding tax on unremitted earnings of foreign subsidiary |  |  |  | 30 |
Gain (loss) in pre-tax income in relation to taxable translation gains (losses) |  |  |  | 0 |
Discrete tax (benefit) expense, due to foreign currency translation gain (loss) |  |  |  | $ 4 | $ 16

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