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Net Periodic Pension and Postretirement Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Pension Plan        
Anticipated cash contributions        
Anticipated cash contributions in current year $ 4   $ 4  
Pension Plan | US        
Components of Net Periodic Benefit Costs        
Service cost 1 $ 2 2 $ 3
Interest cost 3 3 7 6
Expected return on plan assets (4) (5) (9) (10)
Net periodic benefit cost       (1)
Anticipated cash contributions        
Anticipated cash contributions in current year 1   1  
Employer contributions        
Cash contributions made in period     1  
Pension Plan | Non-US        
Components of Net Periodic Benefit Costs        
Service cost 1 1 2 2
Interest cost 2 2 5 5
Expected return on plan assets (2) (3) (4) (5)
Amortization of actuarial loss 1 1 1 1
Net periodic benefit cost 2 1 4 3
Anticipated cash contributions        
Anticipated cash contributions in current year $ 3   3  
Employer contributions        
Cash contributions made in period     2  
Postemployment Retirement Benefits        
Components of Net Periodic Benefit Costs        
Interest cost   1 1 2
Amortization of prior service credit     $ (1) (1)
Net periodic benefit cost   $ 1   $ 1