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Pension and Other Postretirement Benefit Plans - Net Periodic Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 78 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost $ 1 $ 3 $ 6 $ 7 $ (103)
Operating profit | Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 1 1 5 5  
Interest and sundry (income) expense | Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 0 2 1 2  
United States Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 3 3 7 6  
United States Pension Benefits | Operating profit          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 1 1 2 2  
United States Pension Benefits | Interest and sundry (income) expense          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 2 2 5 4  
Foreign Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 1 3 4 6  
Foreign Pension Benefits | Operating profit          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 1 1 4 4  
Foreign Pension Benefits | Interest and sundry (income) expense          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost $ 0 $ 2 $ 0 $ 2