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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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to foreign currency translation gain (loss).

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Gain in pre-tax income in relation to the taxable translation gains which has an effect on the effective income tax rate.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible impairment loss.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to repatriation of foreign earnings.

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