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Employee Benefit Plans and Postretirement Benefits - Net Amounts Recognized in Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]    
Pension, postretirement and other postemployment benefits $ (1,617) $ (1,578)
Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 37 45
Pension, postretirement and other postemployment benefits (889) (887)
Net liability recognized at end of year (852) (842)
Healthcare    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 0 0
Pension, postretirement and other postemployment benefits (273) (260)
Net liability recognized at end of year (273) (260)
Other    
Defined Benefit Plan Disclosure [Line Items]    
Other assets 0 0
Pension, postretirement and other postemployment benefits (455) (431)
Net liability recognized at end of year $ (455) $ (431)