v3.26.1
Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Other Postretirement Benefits        
Service cost $ 21 $ 24 $ 42 $ 47
Interest cost 66 66 131 131
Expected return on plan assets (4) (4) (8) (8)
Amortization of actuarial loss/(gain) (21) (27) (43) (51)
Amortization of prior service cost (16) (16) (31) (31)
Net pension enhancement and curtailment/settlement cost (1) 0 (1) 0
Net benefit cost 45 43 90 88
Pension Benefits - U.S. | Pension Plan        
Service cost 150 138 277 274
Interest cost 164 171 329 341
Expected return on plan assets (165) (149) (329) (298)
Amortization of actuarial loss/(gain) 5 19 10 37
Amortization of prior service cost (7) (8) (15) (15)
Net pension enhancement and curtailment/settlement cost 3 15 2 51
Net benefit cost 150 186 274 390
Pension Benefits - Non-U.S. | Pension Plan        
Service cost 67 82 139 160
Interest cost 203 205 442 427
Expected return on plan assets (199) (206) (430) (427)
Amortization of actuarial loss/(gain) (12) 9 (22) 18
Amortization of prior service cost 16 15 31 28
Net pension enhancement and curtailment/settlement cost 0 0 28 0
Net benefit cost $ 75 $ 105 $ 188 $ 206