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Pension and Other Postretirement Benefits - Schedule of Projected and Changes in Benefit Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Projected Benefit Obligations        
Actuarial (gain) / loss   $ (25)    
Other Postretirement Benefits        
Projected Benefit Obligations        
Benefit obligations at beginning of period   107 $ 108  
Service cost   0 0 $ 1
Interest cost   6 6 4
Actuarial (gain) / loss   (2) 0  
Benefits paid   (9) (11)  
Foreign currency translation   (6) 4  
Benefit obligations at end of period   96 107 108
U.S. Plans | Pension Plan        
Projected Benefit Obligations        
Benefit obligations at beginning of period   1,109 1,094  
Service cost   15 13 19
Interest cost   40 54 31
Plan participants' contributions   0 0  
Amendments   0 1  
Settlements $ (740) (775) 0  
Special termination benefits   0 0  
Actuarial (gain) / loss   (15) 36  
Benefits paid   (75) (89)  
Foreign currency translation   0 0  
Benefit obligations at end of period   299 1,109 1,094
Plan Assets        
Balance at beginning of period   880 886  
Actual gain on plan assets   40 81  
Employer contributions / (withdrawals) 100 125 2  
Plan participants' contributions   0 0  
Settlements   (775) 0  
Benefits paid   (75) (89)  
Foreign currency translation   0 0  
Balance at end of period   195 880 886
Funded status   (104) (229)  
Accumulated benefit obligations at end of period   257 1,065  
Non-U.S. Plans | Pension Plan        
Projected Benefit Obligations        
Benefit obligations at beginning of period   415 387  
Service cost   7 7 9
Interest cost   16 19 13
Plan participants' contributions   2 2  
Amendments   0 (2)  
Settlements $ (119) (122) (8)  
Special termination benefits   0 6  
Actuarial (gain) / loss   (7) 18  
Benefits paid   (22) (38)  
Foreign currency translation   (31) 24  
Benefit obligations at end of period   258 415 387
Plan Assets        
Balance at beginning of period   412 381  
Actual gain on plan assets   27 33  
Employer contributions / (withdrawals)     17  
Employer contributions / (withdrawals)   (12)    
Plan participants' contributions   1 2  
Settlements   (122) (7)  
Benefits paid   (22) (38)  
Foreign currency translation   (30) 24  
Balance at end of period   254 412 $ 381
Funded status   (4) (3)  
Accumulated benefit obligations at end of period   $ 229 $ 389