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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost $ (11) $ (10) $ (31) $ (9)
Operating profit (loss) | Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost 0 1 0 4
Interest and sundry (income) expense | Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost (11) (11) (31) (13)
United States Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost 1 (1) (1) (2)
United States Pension Benefits | Operating profit (loss) | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost 1 1 2 2
United States Pension Benefits | Interest and sundry (income) expense | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost 0 (2) (3) (4)
Foreign Pension Benefits | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost 0 2 3 5
Foreign Pension Benefits | Operating profit (loss) | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost 1 1 4 4
Foreign Pension Benefits | Interest and sundry (income) expense | Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Net periodic benefit cost $ (1) $ 1 $ (1) $ 1