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Employee Benefit Plans - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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U.S. |  |
Pension Plans With Accumulated Benefit Obligation in Excess of Plan Assets |  |
Projected benefit obligations | $ 1,957 | $ 15,103
Accumulated benefit obligations | 1,665 | 13,545
Fair value of plan assets | 55 | 9,842
Int’l. |  |
Pension Plans With Accumulated Benefit Obligation in Excess of Plan Assets |  |
Projected benefit obligations | 1,097 | 2,084
Accumulated benefit obligations | 883 | 1,622
Fair value of plan assets | $ 2 | $ 600

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