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Pension and Postretirement Benefit Plans - Special termination benefits (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2019
item
Jun. 30, 2019
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Benefit Plan Information          
Defined benefit pension and postretirement plans adjustment     $ (171) $ 560 $ (444)
Qualified and Non-qualified Pension Benefits | United States | Funded          
Benefit Plan Information          
Special termination benefits - number of additional years of pension service | item 1        
Special termination benefits - number of additional years of age for certain benefit calculations | item 1        
Special termination benefits charge   $ 35      
Postretirement Benefits | Funded          
Benefit Plan Information          
Defined benefit pension and postretirement plans adjustment   $ 150