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Supplemental Income (Loss) Statement Information - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Other Income and Expenses [Abstract] |  |  |
Interest expense related to outstanding debt | $ 472 | $ 565 | $ 462
Settlements, curtailments, special termination benefits and other | 808 |  |
Unrealized gain on investments | $ 1,600 |  |

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