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Pension and Other Postretirement Benefits (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Other Postretirement Benefits        
Service cost $ 14 $ 22 $ 61 $ 59
Interest cost 65 62 196 187
Expected return on plan assets (4) (5) (12) (15)
Amortization of actuarial loss/(gain) (26) (26) (77) (78)
Amortization of prior service cost (15) (16) (46) (47)
Net benefit cost 34 37 122 106
Pension Benefits - U.S. | Pension Plan        
Service cost 121 135 395 365
Interest cost 170 168 511 504
Expected return on plan assets (149) (181) (447) (543)
Amortization of actuarial loss/(gain) 18 20 55 62
Amortization of prior service cost (8) (7) (23) (23)
Net pension enhancement and curtailment/settlement cost 11 13 62 30
Net benefit cost 163 148 553 395
Pension Benefits - Non-U.S. | Pension Plan        
Service cost 83 85 243 254
Interest cost 208 203 635 628
Expected return on plan assets (207) (235) (634) (726)
Amortization of actuarial loss/(gain) 10 25 28 74
Amortization of prior service cost 15 12 43 37
Net pension enhancement and curtailment/settlement cost 31 0 31 0
Net benefit cost $ 140 $ 90 $ 346 $ 267