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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at January 1 $ 11,430    
Fair value of plan assets at December 31 12,802 $ 11,430  
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 1,748 1,511  
Service cost 6 38 $ 43
Interest cost 49 60 61
Benefits paid (35) (40)  
Settlements paid (95) (73)  
Actuarial (gains)/losses 213 251  
Currency 0 0  
Other [1] 1 1  
Projected benefit obligation at December 31 1,887 1,748 1,511
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at January 1 1,739 1,510  
Actual return on plan assets 337 334  
Contributions 13 8  
Benefits paid (35) (40)  
Settlements paid (95) (73)  
Currency 0 0  
Other [1] 0 0  
Fair value of plan assets at December 31 1,959 1,739 1,510
Net pension (liabilities)/assets at December 31 72 (9)  
Non-U.S. Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation at January 1 10,458 9,578  
Service cost 121 122 146
Interest cost 149 202 199
Benefits paid (473) (424)  
Settlements paid 0 (1)  
Actuarial (gains)/losses 679 761  
Currency 572 207  
Other [1] 152 13  
Projected benefit obligation at December 31 11,658 10,458 9,578
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Fair value of plan assets at January 1 9,758 8,465  
Actual return on plan assets 865 1,211  
Contributions 208 261  
Benefits paid (473) (424)  
Settlements paid 0 (1)  
Currency 489 246  
Other [1] 125 0  
Fair value of plan assets at December 31 10,972 9,758 $ 8,465
Net pension (liabilities)/assets at December 31 $ (686) $ (700)  
[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