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Supplemental Other Comprehensive Income (Loss) Information - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Equity [Abstract] |  |
Unrecognized pension and other retiree benefit costs, aftertax | $ 647 | $ 631
Foreign currency translation adjustments | $ 3,351 | $ (3,491)

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