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Pension Plans, Postretirement and Other Employee Benefits - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Pension      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Employer contributions, remainder of fiscal year   $ 8  
Postretirement      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Employer contributions   4  
Employer contributions, remainder of fiscal year   5  
US | Pension      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Employer contributions $ 10 1  
Settlement loss $ 6 0 $ 6
US | Postretirement      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Settlement loss   0 0
Foreign | Pension      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Employer contributions   6  
Settlement loss   $ 0 $ 0