v3.25.0.1
Post-Employment Benefits - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined benefit plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 286 $ 270 $ 454
Interest cost 451 432 297
Expected return on plan assets (785) (723) (712)
Amortization of prior service cost 0 1 2
Amortization of actuarial loss (52) (16) (231)
Net periodic benefit cost (credit) 4 (4) 272
Other post-employment plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 43 37 51
Interest cost 41 37 23
Amortization of prior service cost (36) (36) (38)
Amortization of actuarial loss (17) (12) (26)
Net periodic benefit cost (credit) $ 65 $ 50 $ 62