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Pensions Benefit Plans and Other Postretirement Benefits - Projected and Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Details) - Pension Benefit Plans - Funded Plan - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
U.S. |  |
Projected Benefit Obligation Exceeds the Fair Value of Plan Assets |  |
Projected benefit obligations | $ 1,590 | $ 1,505
Accumulated benefit obligation | 1,590 | 1,505
Fair value of plan assets | 1,324 | 1,215
Accumulated Benefit Obligations Exceeds the Fair Value of Plan Assets |  |
Projected benefit obligations | 1,590 | 1,505
Accumulated benefit obligation | 1,590 | 1,505
Fair value of plan assets | 1,324 | 1,215
Non-U.S. |  |
Projected Benefit Obligation Exceeds the Fair Value of Plan Assets |  |
Projected benefit obligations | 331 | 952
Accumulated benefit obligation | 309 | 927
Fair value of plan assets | 67 | 706
Accumulated Benefit Obligations Exceeds the Fair Value of Plan Assets |  |
Projected benefit obligations | 331 | 952
Accumulated benefit obligation | 309 | 927
Fair value of plan assets | $ 67 | $ 706

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