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Pensions And Other Postretirement Benefits - Components of Expense and Assumptions (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Postretirement Benefits Plan |  |  |
Components of expense |  |  |
Service cost | $ 9 | $ 16 | $ 18
Interest cost | 236 | 148 | 123
Expected return on plan assets | 0 | 0 | 0
Amortization of net actuarial (gains) losses | (23) | 67 | 97
Curtailments, settlements and other | 2 | (5) | (6)
Net periodic pension and OPEB (income) expense | $ 224 | $ 226 | $ 232
Weighted-average assumptions used to determine benefit obligations(a) |  |  |
Discount rate | 5.13% | 5.51% | 2.97%
Weighted-average assumptions used to determine net expense(a) |  |  |
Discount rate | 5.48% | 2.84% | 2.24%
U.S. | Pension Plan |  |  |
Components of expense |  |  |
Service cost | $ 173 | $ 233 | $ 260
Service cost | 103 | 161 |
Interest cost | 2,273 | 1,292 | 1,074
Expected return on plan assets | (2,922) | (3,000) | (3,178)
Amortization of net actuarial (gains) losses | 0 | 18 | 26
Curtailments, settlements and other | 126 | (17) | 15
Net periodic pension and OPEB (income) expense | $ (350) | $ (1,474) | $ (1,803)
Weighted-average assumptions used to determine benefit obligations(a) |  |  |
Discount rate | 5.12% | 5.47% | 2.78%
Weighted-average assumptions used to determine net expense(a) |  |  |
Discount rate | 5.37% | 2.34% | 1.86%
Expected rate of return on plan assets | 6.30% | 5.38% | 5.63%
U.S. | Pension Plan | Plan |  |  |
Weighted-average assumptions used to determine net expense(a) |  |  |
Expected rate of return on plan assets | 6.30% | 6.30% |
Non-U.S. | Pension Plan |  |  |
Components of expense |  |  |
Service cost | $ 173 | $ 157 | $ 121
Service cost | 161 | 146 |
Interest cost | 551 | 293 | 236
Expected return on plan assets | (573) | (534) | (610)
Amortization of net actuarial (gains) losses | 32 | 133 | 212
Curtailments, settlements and other | 33 | 10 | 7
Net periodic pension and OPEB (income) expense | $ 216 | $ 59 | $ (34)
Weighted-average assumptions used to determine benefit obligations(a) |  |  |
Discount rate | 4.41% | 4.85% | 2.13%
Weighted-average assumptions used to determine net expense(a) |  |  |
Discount rate | 5.33% | 2.98% | 2.38%
Expected rate of return on plan assets | 5.65% | 4.39% | 4.67%

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