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Employee Benefit Plans and Postretirement Benefits - Defined Benefit Pension, Healthcare and Other Plans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Beginning benefit obligation      
Plan amendments $ 527    
Change in the fair value of plan assets:      
Beginning plan assets 2,248    
Ending plan assets 1,952 $ 2,248  
Pension Plans      
Beginning benefit obligation      
Beginning benefit obligation 2,938 3,029  
Service cost 22 23 $ 25
Interest cost 44 74 71
Plan participants’ contributions 3 3  
Actuarial loss 215 377  
Gross benefits paid (139) (156)  
Plan amendments 2 (2)  
Currency translation adjustments and other (426) (410)  
Ending benefit obligation 2,659 2,938 3,029
Change in the fair value of plan assets:      
Beginning plan assets 2,096 2,281  
Actual return on plan assets 231 305  
Employer contributions 70 53  
Plan participants’ contributions 3 3  
Gross benefits paid (114) (130)  
Currency translation adjustments and other (479) (416)  
Ending plan assets 1,807 2,096 2,281
Funded status (852) (842)  
Healthcare      
Beginning benefit obligation      
Beginning benefit obligation 412 434  
Service cost 4 5 6
Interest cost 10 14 24
Plan participants’ contributions 5 10  
Actuarial loss 21 45  
Gross benefits paid (37) (42)  
Plan amendments 1 (47)  
Currency translation adjustments and other 2 (7)  
Ending benefit obligation 418 412 434
Change in the fair value of plan assets:      
Beginning plan assets 152 141  
Actual return on plan assets 17 27  
Employer contributions 0 0  
Plan participants’ contributions 0 0  
Gross benefits paid (9) (16)  
Currency translation adjustments and other (15) 0  
Ending plan assets 145 152 141
Funded status (273) (260)  
Other      
Beginning benefit obligation      
Beginning benefit obligation 431 422  
Service cost 16 13 15
Interest cost 1 3 3
Plan participants’ contributions 0 0  
Actuarial loss 0 37  
Gross benefits paid (31) (37)  
Plan amendments 0 0  
Currency translation adjustments and other 38 (7)  
Ending benefit obligation 455 431 422
Change in the fair value of plan assets:      
Beginning plan assets 0 0  
Actual return on plan assets 0 0  
Employer contributions 0 0  
Plan participants’ contributions 0 0  
Gross benefits paid 0 0  
Currency translation adjustments and other 0 0  
Ending plan assets 0 0 $ 0
Funded status $ (455) $ (431)