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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income tax expense (benefit) $ 5     $ 31   $ (27) $ 75
Effective income tax rate           (28.00%) 19.00%
Release of valuation allowance   $ 30          
Pension settlement charge 2 258       $ 260  
Pension settlement charge associated income tax benefit   9          
Other adjustments   $ (48) $ 6   $ (46)    
Effective income tax rate, excluding effects of special items           28.00% 29.00%
Tax settlements         $ 7    
US federal statutory income tax rate           21.00%  
BRAZIL              
Release of valuation allowance $ 22            
UNITED STATES              
Release of valuation allowance     $ 22