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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 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 (loss) | 11 |  | 4 |  | (42) |  | (27) |
March 31, 2023 | $ | (437) |  | (7) |  | (5,583) |  | (6,027) |
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 March 31 |
| 2023 | 2022 |  |
Defined benefit plans | $ | 11 |  | 4 |  |  |
The above amounts are included in the computation of net periodic benefit cost and are presented net of tax expense of $3 million and $2 million for the three-month periods ended March 31, 2023 and March 31, 2022, respectively. See Note 13.

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