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Net Periodic Pension and Postretirement Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 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 2 $ 1 4 $ 4
Interest cost 4 4 11 10
Expected return on plan assets (5) (6) (14) (16)
Net periodic benefit cost/(benefit) 1 (1) 1 (2)
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 2 3
Interest cost 3 3 8 8
Expected return on plan assets (2) (2) (6) (7)
Amortization of actuarial loss     1 1
Net periodic benefit cost/(benefit) 1 2 5 5
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        
Service cost   1   1
Interest cost 1   2 2
Amortization of prior service credit     (1) (1)
Net periodic benefit cost/(benefit) $ 1 $ 1 $ 1 $ 2