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Other Comprehensive Income Information (Amounts Reclassified Out Of Acc Other Comp Income) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Comprehensive Income Information Before Tax [Abstract] |  |  |
Foreign exchange translation gain/(loss) included in net income (Statement of Income line: Other income) | $ 0 | $ (609) | $ 0
Amortization and settlement of postretirement benefits reserves adjustment included in net periodic benefit costs (Statement of Income line: Non-service pension and postretirement benefit expense) | $ (70) | $ (81) | $ (519)

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