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Post-Employment Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Defined benefit plans        
Defined benefit and other post-employment plans        
Service cost $ 66 $ 71 $ 197 $ 214
Interest cost 122 113 363 339
Expected return on plan assets (209) (196) (623) (589)
Amortization of prior service credit 0 0 0 0
Amortization of actuarial loss 8 13 24 39
Net periodic benefit cost (credit) (13) 1 (39) 3
Other post-employment plans        
Defined benefit and other post-employment plans        
Service cost 10 11 30 32
Interest cost 11 10 33 31
Expected return on plan assets 0 0 0 0
Amortization of prior service credit (9) (9) (27) (27)
Amortization of actuarial loss 3 4 7 13
Net periodic benefit cost (credit) $ 15 $ 16 $ 43 $ 49