v3.25.4
Pensions and Other Postretirement Benefits - Components of Expense and Assumptions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Other Postretirement Benefits Plan      
Components of expense      
Service cost $ 10 $ 10 $ 9
Interest cost 219 226 236
Expected return on plan assets 0 0 0
Amortization of net actuarial (gains) losses (15) 1 (23)
Curtailments, settlements, and other 0 (1) 2
Net periodic pension and OPEB (income) expense $ 214 $ 236 $ 224
Weighted-average assumptions used to determine benefit obligations      
Discount rate 5.26% 5.51% 5.13%
Weighted-average assumptions used to determine net expense      
Discount rate 5.36% 5.13% 5.48%
U.S. | Pension Plan      
Components of expense      
Service cost $ 166 $ 185 $ 173
Interest cost 1,995 2,132 2,273
Expected return on plan assets (2,593) (2,740) (2,922)
Amortization of net actuarial (gains) losses 10 8 0
Curtailments, settlements, and other 65 56 126
Net periodic pension and OPEB (income) expense $ (357) $ (359) $ (350)
Weighted-average assumptions used to determine benefit obligations      
Discount rate 5.18% 5.56% 5.12%
Weighted-average assumptions used to determine net expense      
Discount rate 5.29% 5.08% 5.37%
Expected rate of return on plan assets 6.54% 6.27% 6.30%
Non-U.S. | Pension Plan      
Components of expense      
Service cost $ 177 $ 165 $ 173
Interest cost 479 505 551
Expected return on plan assets (535) (521) (573)
Amortization of net actuarial (gains) losses 41 46 32
Curtailments, settlements, and other 10 18 33
Net periodic pension and OPEB (income) expense $ 172 $ 213 $ 216
Weighted-average assumptions used to determine benefit obligations      
Discount rate 4.84% 4.68% 4.41%
Weighted-average assumptions used to determine net expense      
Discount rate 5.21% 5.10% 5.33%
Expected rate of return on plan assets 5.51% 5.25% 5.65%