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Net Periodic Pension and Postretirement Benefit Costs (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2018
Pension Plan | Forecast      
Anticipated cash contributions      
Anticipated cash contributions to pension plans in 2017     $ 5
Pension Plan | US      
Components of Net Periodic Benefit Costs      
Service cost $ 1 $ 1  
Interest cost 3 3  
Expected return on plan assets (5) (5)  
Net periodic benefit cost/Net postretirement benefit costs (1) (1)  
Employer Contributions      
Cash contributions to defined benefit pension plan 1    
Pension Plan | US | Forecast      
Anticipated cash contributions      
Anticipated cash contributions to pension plans in 2017     2
Pension Plan | Non-US      
Components of Net Periodic Benefit Costs      
Service cost 1 1  
Interest cost 3 2  
Expected return on plan assets (2) (3)  
Amortization of actuarial loss   1  
Net periodic benefit cost/Net postretirement benefit costs 2 1  
Employer Contributions      
Cash contributions to defined benefit pension plan 1    
Pension Plan | Non-US | Forecast      
Anticipated cash contributions      
Anticipated cash contributions to pension plans in 2017     $ 3
Postemployment Retirement Benefits      
Components of Net Periodic Benefit Costs      
Interest cost 1 1  
Amortization of prior service credit $ (1) $ (1)