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Pension and Other Postretirement Benefits - Postretirement funded status (Details) - Postemployment Retirement Benefits - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Benefit obligation      
Balance at the beginning of the period $ 68 $ 69  
Service cost 1   $ 1
Interest cost 2 3 3
Amendments 4    
Actuarial (gain) loss (5) 4  
Benefits paid (4) (5)  
Foreign currency translation (1) (3)  
Balance at the end of the period 65 68 $ 69
Funded status $ (65) $ (68)