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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
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost $ (2) $ 2 $ 1 $ (1)
Operating profit | Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 1 1 3 3
Interest and sundry (income) expense | Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost (3) 1 (2) (4)
United States Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost (1) (2) (1) (3)
United States Pension Benefits | Operating profit | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 0 0 1 1
United States Pension Benefits | Interest and sundry (income) expense | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost (1) (2) (2) (4)
Foreign Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 2 2 3 5
Foreign Pension Benefits | Operating profit | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 1 2 3 3
Foreign Pension Benefits | Interest and sundry (income) expense | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost $ 1 $ 0 $ 0 $ 2