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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost $ (10) $ 4 $ (9) $ 3
Operating profit | Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 1 2 4 5
Interest and sundry (income) expense | Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost (11) 2 (13) (2)
United States Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost (1) 7 (2) 4
United States Pension Benefits | Operating profit | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 1 1 2 2
United States Pension Benefits | Interest and sundry (income) expense | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost (2) 6 (4) 2
Foreign Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 2 2 5 7
Foreign Pension Benefits | Operating profit | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost 1 1 4 4
Foreign Pension Benefits | Interest and sundry (income) expense | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic cost $ 1 $ 1 $ 1 $ 3