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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance $ 9,087    
Ending balance 8,401 $ 9,087  
U.S. Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning balance 1,206 1,193  
Service cost 3 3 $ 5
Interest cost 60 64 51
Benefits paid (41) (45)  
Settlements paid (48) (63)  
Actuarial losses/(gains) 3 54  
Divestitures 0 0  
Currency 0 0  
Other 0 0  
Ending balance 1,183 1,206 1,193
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance 1,277 1,265  
Actual return on plan assets 8 114  
Contributions 4 6  
Benefits paid (41) (45)  
Settlements paid (48) (63)  
Divestitures 0 0  
Currency 0 0  
Other 0 0  
Ending balance 1,200 1,277 1,265
Net pension assets at December 31 17 71  
Non-U.S. Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Beginning balance 7,404 6,878  
Service cost 59 54 88
Interest cost 283 303 172
Benefits paid (446) (424)  
Settlements paid (1) 0  
Actuarial losses/(gains) (271) 235  
Divestitures 0 (6)  
Currency (312) 337  
Other 37 27  
Ending balance 6,753 7,404 6,878
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Beginning balance 7,907 7,389  
Actual return on plan assets 42 423  
Contributions 109 162  
Benefits paid (446) (424)  
Settlements paid (1) 0  
Divestitures 0 (4)  
Currency (324) 362  
Other 10 (1)  
Ending balance 7,297 7,907 $ 7,389
Net pension assets at December 31 $ 544 $ 503