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Pension, Other Postretirement Benefits and Savings Plans - Selected Pension Plan Information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
United States |  |
All plans: |  |
Accumulated benefit obligation | $ 5,220 | $ 4,994
Plans not fully-funded: |  |
Projected benefit obligation | 5,235 | 5,009
Accumulated benefit obligation | 5,220 | 4,994
Fair value of plan assets | 4,970 | 4,780
Non-U.S. |  |
All plans: |  |
Accumulated benefit obligation | 3,284 | 3,097
Plans not fully-funded: |  |
Projected benefit obligation | 933 | 1,059
Accumulated benefit obligation | 856 | 991
Fair value of plan assets | $ 185 | $ 370

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