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Pension and Other Postretirement Benefits - Schedule of Components of Pension Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Postretirement Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost   $ 0 $ 0 $ 1
Interest cost   6 6 4
Amortization of actuarial loss   0 0 2
Amortization of prior service cost   0 0 (20)
Net periodic cost   6 6 (13)
U.S. Plans | Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost   15 13 19
Interest cost   40 54 31
Expected return on plan assets   (46) (60) (75)
Settlements $ 469      
Settlements and curtailments   469 0 1
Amortization of actuarial loss   32 43 44
Amortization of prior service cost   1 1 1
Net periodic cost   511 51 21
Non-U.S. Plans | Pension Plan        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost   7 7 9
Interest cost   16 19 13
Expected return on plan assets   (18) (22) (22)
Settlements $ 47 44 0 0
Special termination benefits   0 6 0
Amortization of actuarial loss   2 3 5
Amortization of prior service cost   0 0 (1)
Net periodic cost   $ 51 $ 13 $ 4