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Taxes - Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Taxes |  |  |  |
Effective tax rate (as a percent) | 28.70% | 29.60% | 37.00% | 28.20%
Devaluation of Mexican peso against U.S. dollar (as a percent) |  |  | 22.00% |
Discrete tax expense (benefit) due to taxable translation gains on net U.S. dollar monetary assets held in Mexico |  |  | $ 22 | $ 1

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- Definition Represents the discrete tax expense (benefit) during the period due to the taxable translation gain (loss) during the period. + References No definition available. + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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