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Employee Postretirement Benefits (Principal Plans and All Other Pension Plans) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Principal Plans |  |  |
Projected benefit obligation (“PBO”) | $ 1,900 | $ 2,123 |
Accumulated benefit obligation (“ABO”) | 1,900 | 2,123 |
Fair value of plan assets | 1,795 | 2,019 |
All Other Pension Plans |  |  |
Projected benefit obligation (“PBO”) | 336 | 346 |
Accumulated benefit obligation (“ABO”) | 289 | 298 |
Fair value of plan assets | 298 | 310 |
Defined Benefit Pension Plans |  |  |
Projected benefit obligation (“PBO”) | 2,236 | 2,469 | $ 2,441
Accumulated benefit obligation (“ABO”) | 2,189 | 2,421 |
Fair value of plan assets | $ 2,093 | $ 2,329 | $ 2,321

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