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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Components of Accumulated Other Comprehensive Loss in the Equity Section of the Balance Sheet | Accumulated other comprehensive income (loss) in the equity section of the balance sheet included:
| Millions of Dollars
| Defined Benefit Plans | Net Unrealized Holding Gain/(Loss) on Securities | Foreign Currency Translation | Unrealized Gain/(Loss) on Hedging Activities | Accumulated Other Comprehensive Income/(Loss)
December 31, 2021 | $ | (31) |  | — |  | (4,919) |  | — |  | (4,950) |
Other comprehensive income (loss) | (417) |  | (11) |  | (622) |  | — |  | (1,050) |
December 31, 2022 | (448) |  | (11) |  | (5,541) |  | — |  | (6,000) |
Other comprehensive income (loss) | 55 |  | 13 |  | 197 |  | 62 |  | 327 |
December 31, 2023 | (393) |  | 2 |  | (5,344) |  | 62 |  | (5,673) |
Other comprehensive income (loss) | 3 |  | 1 |  | (760) |  | (44) |  | (800) |
December 31, 2024 | $ | (390) |  | 3 |  | (6,104) |  | 18 |  | (6,473) |
Items Reclassified out of Accumulated Other Comprehensive Income (Loss) | The following table summarizes reclassifications out of accumulated other comprehensive income (loss) during the years ended December 31:
| Millions of Dollars
| 2024 | 2023
Defined Benefit Plans* | $ | 19 |  | 33 |
*Included in the computation of net periodic benefit cost and are presented net of tax expense of: | $ | 8 |  | 11 |
See Note 15. |  |

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