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Benefit Plans - Postretirement amounts recognized (Details) - Postemployment Retirement Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amounts recognized in the Consolidated Balance Sheets      
Current liabilities $ (4) $ (4)  
Non-current liabilities (60) (66)  
Net asset (liability) recognized (64) (70)  
Amounts recognized in accumulated other comprehensive loss, excluding tax effects, that have not yet been recognized as components of net periodic benefit cost      
Net actuarial loss 8 11  
Prior service cost (4) (6)  
Net amount recognized 4 5  
Components of net periodic benefit cost      
Service cost 1 1 $ 1
Interest cost 3 3 2
Amortization of prior service credit (2) (3) (2)
Net periodic benefit cost 2 1 1
Amount included in accumulated other comprehensive loss for prior service credit expected to be recognized in net periodic benefit cost (2)    
Amounts recorded in other comprehensive income and net periodic benefit cost      
Net actuarial loss (gain) (3) 2 2
Amortization of prior service credit 2 3 2
Total recorded in other comprehensive income (1) 5 4
Net periodic benefit cost 2 1 1
Total recorded in other comprehensive income and net periodic benefit cost $ 1 $ 6 $ 5