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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Components of Accumulated Other Comprehensive Loss in the Equity Section of the Balance Sheet | Accumulated other comprehensive loss in the equity section of our consolidated balance sheet includes:
| Millions of Dollars
| Defined Benefit Plans | Net Unrealized Loss on Securities | Foreign Currency Translation |  | Accumulated Other Comprehensive Loss
December 31, 2022 | $ | (448) |  | (11) |  | (5,541) |  |  | (6,000) |
Other comprehensive income | 17 |  | 1 |  | 57 |  |  | 75 |
June 30, 2023 | $ | (431) |  | (10) |  | (5,484) |  |  | (5,925) |
Schedule of Items Reclassified out of Accumulated Other Comprehensive Income (Loss) | The following table summarizes reclassifications out of accumulated other comprehensive loss and into net income:
| Millions of Dollars
| Three Months Ended June 30 | Six Months Ended June 30
| 2023 | 2022 | 2023 | 2022
Defined benefit plans | $ | 6 |  | 12 |  | 17 |  | 16 |
The above amounts are included in the computation of net periodic benefit cost and are presented net of tax expense of $3 million and $3 million for the three-month periods ended June 30, 2023 and June 30, 2022, respectively, and $6 million and $5 million for the six-month periods ended June 30, 2023 and June 30, 2022, respectively. See Note 14.

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