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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 11, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restructuring and other charges   $ 5   $ 105 $ 14 $ 144
Settlement charges   (3)   (64) (6) (64)
Increase (decrease) in minimum required pension funding $ 120          
Pension Settlement Cost            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restructuring and other charges   3     6  
Pension benefits            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Settlement charges   $ (3)   (64) $ (6) $ (64)
Pension benefits | US            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Settlement charges       2    
Increase (decrease) in obligation, pension benefits       6    
Pension benefits | Foreign Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Settlement charges       $ 62    
Other postretirement benefits            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Increase (decrease) in obligation, pension benefits     $ 39