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Pensions And Other Postretirement Benefits - Components of Expense and Assumptions (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Postretirement Benefits Plan      
Components of expense      
Service cost $ 10 $ 9 $ 16
Interest cost 226 236 148
Expected return on plan assets 0 0 0
Amortization of net actuarial (gains) losses 1 (23) 67
Curtailments, settlements and other (1) 2 (5)
Net periodic pension and OPEB (income) expense $ 236 $ 224 $ 226
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 5.51% 5.13% 5.51%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 5.13% 5.48% 2.84%
U.S. | Pension Plan      
Components of expense      
Service cost $ 185 $ 173 $ 233
Service cost 113 103  
Interest cost 2,132 2,273 1,292
Expected return on plan assets (2,740) (2,922) (3,000)
Amortization of net actuarial (gains) losses 8 0 18
Curtailments, settlements and other 56 126 (17)
Net periodic pension and OPEB (income) expense $ (359) $ (350) $ (1,474)
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 5.56% 5.12% 5.47%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 5.08% 5.37% 2.34%
Expected rate of return on plan assets 6.27% 6.30% 5.38%
Non-U.S. | Pension Plan      
Components of expense      
Service cost $ 165 $ 173 $ 157
Service cost 156 161  
Interest cost 505 551 293
Expected return on plan assets (521) (573) (534)
Amortization of net actuarial (gains) losses 46 32 133
Curtailments, settlements and other 18 33 10
Net periodic pension and OPEB (income) expense $ 213 $ 216 $ 59
Weighted-average assumptions used to determine benefit obligations(a)      
Discount rate 4.68% 4.41% 4.85%
Weighted-average assumptions used to determine net expense(a)      
Discount rate 5.10% 5.33% 2.98%
Expected rate of return on plan assets 5.25% 5.65% 4.39%