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Pension and Other Postretirement Benefit Plans - Net Periodic Costs Recognized in Operating Profit and Interest and Sundry (Income) Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 87 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost $ 2 $ 3 $ 11 $ 5 $ (87)
Operating profit | Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 1 2 3 4  
Interest and sundry (income) expense | Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 1 1 8 1  
United States Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 0 2 0 4  
United States Pension Benefits | Operating profit          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 0 0 1 1  
United States Pension Benefits | Interest and sundry (income) expense          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 0 2 (1) 3  
Foreign Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost (2) 2 0 3  
Foreign Pension Benefits | Operating profit          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 2 2 3 3  
Foreign Pension Benefits | Interest and sundry (income) expense          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost $ (4) $ 0 $ (3) $ 0