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Benefit Plans - Postretirement amounts recognized (Details) - Postemployment Retirement Benefits - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Amounts recognized in the Consolidated Balance Sheets      
Current liabilities $ (4) $ (4)  
Non-current liabilities (65) (60)  
Net asset (liability) recognized (69) (64)  
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 14 8  
Prior service cost (2) (4)  
Net amount recognized 12 4  
Components of net periodic benefit cost      
Service cost 1 1 $ 1
Interest cost 3 3 3
Amortization of prior service credit (2) (2) (3)
Net periodic benefit cost 2 2 1
Amount related to the amortization of the entity's accumulated actuarial loss included in accumulated other comprehensive loss that will be recognized in net pension expense in next fiscal year (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) 6 (3) 2
Amortization of prior service credit 2 2 3
Total recorded in other comprehensive income 8 (1) 5
Net periodic benefit cost 2 2 1
Total recorded in other comprehensive income and net periodic benefit cost $ 10 $ 1 $ 6