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Pension and Other Postretirement Benefits - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 11, 2021
Oct. 31, 2021
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restructuring and other charges     $ 8   $ 22   $ 22 $ 166
Settlement charges     (3)   (3)   (9) (67)
Pension benefits                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restructuring and other charges     3   8   9 10
Increase (decrease) in minimum required pension funding $ 120              
Settlement charges     (3)   (8)   (9) (72)
Pension benefits | UK                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Settlement charges           $ 62   62
Pension benefits | Subsequent Event                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Restructuring and other charges   $ 30            
Increase (decrease) in obligation, pension benefits   $ 125            
Other postretirement benefits                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase (decrease) in obligation, pension benefits       $ 39        
Curtailments     $ 0   $ 2   $ 0 $ 2
Other postretirement benefits | US                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Increase (decrease) in obligation, pension benefits           $ 6