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Benefit Plans - Projected Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Details) - Pension Plans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at January 1 $ 12,802    
Fair value of plan assets at December 31 12,724 $ 12,802  
Increase in projected benefit obligations due to impact of market changes and review of historical features   133  
U.S. Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at January 1 1,887 1,748  
Service cost 6 6 $ 38
Interest cost 42 49 60
Benefits paid (31) (35)  
Settlements paid (113) (95)  
Actuarial (gains)/losses (63) 213  
Currency 0 0  
Other [1] 1 1  
Projected benefit obligation at December 31 1,729 1,887 1,748
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at January 1 1,959 1,739  
Actual return on plan assets 1 337  
Contributions 10 13  
Benefits paid (31) (35)  
Settlements paid (113) (95)  
Currency 0 0  
Other [1] 0 0  
Fair value of plan assets at December 31 1,826 1,959 1,739
Net pension (liabilities)/assets at December 31 97 72  
Non-U.S. Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at January 1 11,658 10,458  
Service cost 137 121 122
Interest cost 130 149 202
Benefits paid (533) (473)  
Settlements paid 0 0  
Actuarial (gains)/losses (269) 679  
Currency (308) 572  
Other [1] 6 152  
Projected benefit obligation at December 31 10,821 11,658 10,458
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at January 1 10,972 9,758  
Actual return on plan assets 548 865  
Contributions 292 208  
Benefits paid (533) (473)  
Settlements paid 0 0  
Currency (258) 489  
Other [1] 0 125  
Fair value of plan assets at December 31 11,021 10,972 $ 9,758
Net pension (liabilities)/assets at December 31 $ 200 $ (686)  
[1] In 2020 we reviewed the impact of market changes on design features of certain historical defined contribution plans. The review resulted in additional plans being accounted for as defined benefit pension plans, which resulted in increases of $133 million in the projected benefit obligation and $125 million in plan assets in 2020.