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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