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Taxes - Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Taxes |  |  |  |
Effective tax rate (as a percent) | 11.70% | 28.70% | 464.70% | 37.00%
Discrete tax benefit, due to reversal of accrual for withholding tax on unremitted earnings | $ 30 |  |  |
Gain (loss) in pre-tax income in relation to taxable translation gains (losses) |  | $ 0 |  | $ 0
Assets held for sale impairment |  |  | $ 360 |
Income tax benefit with respect to impairment |  |  |  | $ 0
Devaluation of Mexican peso against U.S. dollar (as a percent) |  |  |  | 22.00%
Discreate tax (benefit) expense, due to foreign currency translation gain (loss) |  |  | $ (1) | $ 22

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