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Pension and Other Postretirement Benefit Plans - Net Periodic Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 72 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
United States Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost $ 2 $ 2  
Foreign Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 1 2  
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 2 2 $ 104
Operating profit | United States Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 1 1  
Operating profit | Foreign Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 1 1  
Operating profit | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 2 2  
Interest and sundry (income) expense | United States Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 1 1  
Interest and sundry (income) expense | Foreign Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost 0 1  
Interest and sundry (income) expense | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic cost $ 0 $ 0