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 |