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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 9 Months Ended 87 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost $ 6 $ 1 $ 17 $ 6 $ (83)
Operating profit | Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 2 1 5 5  
Interest and sundry (income) expense | Other Postretirement Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 4 0 12 1  
United States Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 1 3 1 7  
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 0 2 (1) 5  
Foreign Pension Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Net periodic cost 1 1 1 4  
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 $ 0 $ (3) $ 0