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Employee Postretirement Benefits (Principal Plans and All Other Pension Plans) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Principal Plans |  |  |
Projected benefit obligation (PBO) | $ 3,406 | $ 3,094 |
Accumulated benefit obligation (ABO) | 3,406 | 3,094 |
Fair value of plan assets | 3,303 | 2,936 |
All Other Pension Plans |  |  |
Projected benefit obligation (PBO) | 641 | 593 |
Accumulated benefit obligation (ABO) | 561 | 521 |
Fair value of plan assets | 500 | 462 |
Defined Benefit Pension Plans |  |  |
Projected benefit obligation (PBO) | 4,047 | 3,687 | $ 4,296
Accumulated benefit obligation (ABO) | 3,967 | 3,615 |
Fair value of plan assets | $ 3,803 | $ 3,398 | $ 3,897

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