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Employee Benefit Plans - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - Pension Benefits - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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U.S. |  |
Pension Plans With Accumulated Benefit Obligation in Excess of Plan Assets |  |
Projected benefit obligations | $ 1,203 | $ 1,322
Accumulated benefit obligations | 1,108 | 1,135
Fair value of plan assets | 0 | 0
Int'l. |  |
Pension Plans With Accumulated Benefit Obligation in Excess of Plan Assets |  |
Projected benefit obligations | 913 | 828
Accumulated benefit obligations | 773 | 671
Fair value of plan assets | $ 4 | $ 3

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