v3.25.4
Post-Employment Benefits - Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Defined benefit plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost $ 264 $ 286 $ 270
Interest cost 484 451 432
Expected return on plan assets (832) (785) (723)
Amortization of prior service cost 0 0 1
Amortization of actuarial loss (31) (52) (16)
Net periodic benefit cost (credit) (53) 4 (4)
Other post-employment plans      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Service cost 40 43 37
Interest cost 44 41 37
Amortization of prior service cost (36) (36) (36)
Amortization of actuarial loss (10) (17) (12)
Net periodic benefit cost (credit) $ 58 $ 65 $ 50