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