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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance $ 8,538    
Ending balance 9,087 $ 8,538  
U.S. Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning balance 1,193 1,729  
Service cost 3 5 $ 6
Interest cost 64 51 42
Benefits paid (45) (39)  
Settlements paid (63) (71)  
Actuarial losses/(gains) 54 (482)  
Divestitures/acquisitions 0 0  
Currency 0 0  
Other 0 0  
Ending balance 1,206 1,193 1,729
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance 1,265 1,826  
Actual return on plan assets 114 (455)  
Contributions 6 4  
Benefits paid (45) (39)  
Settlements paid (63) (71)  
Divestitures 0 0  
Currency 0 0  
Other 0 0  
Ending balance 1,277 1,265 1,826
Net pension assets at December 31 71 72  
Non-U.S. Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning balance 6,878 10,821  
Service cost 54 88 137
Interest cost 303 172 130
Benefits paid (424) (461)  
Settlements paid 0 0  
Actuarial losses/(gains) 235 (2,844)  
Divestitures/acquisitions (6) 18  
Currency 337 (957)  
Other 27 41  
Ending balance 7,404 6,878 10,821
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance 7,389 11,021  
Actual return on plan assets 423 (2,388)  
Contributions 162 211  
Benefits paid (424) (461)  
Settlements paid 0 0  
Divestitures (4) 0  
Currency 362 (992)  
Other (1) (2)  
Ending balance 7,907 7,389 $ 11,021
Net pension assets at December 31 $ 503 $ 511