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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
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost $ 4 $ 6 $ 3 $ 17
Operating profit | Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 2 2 5 5
Interest and sundry (income) expense | Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 2 4 (2) 12
United States Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 7 1 4 1
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 6 0 2 (1)
Foreign Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 2 1 7 1
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 $ 1 $ 0 $ 3 $ (3)