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Income And Other Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward] |  |  |
Balance at January 1 | $ 3,935 | $ 3,398 | $ 9,130
Additions based on current year's tax positions | 376 | 350 | 539
Additions for prior years' tax positions | 103 | 400 | 294
Reductions for prior years' tax positions | (293) | (38) | (6,243)
Reductions due to lapse of the statute of limitations | (17) | (25) | (16)
Settlements with tax authorities | (13) | (153) | (277)
Foreign exchange effects/other | (56) | 3 | (29)
Balance at December 31 | $ 4,035 | $ 3,935 | $ 3,398

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