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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2026
Equity [Abstract] |
Changes in Accumulated Other Comprehensive Loss by Component | The following table shows the changes in accumulated other comprehensive income (loss) by component. Amounts in parentheses indicate debits.
(Millions of dollars) | Pension Benefits |  | Other Benefits |  | Other |  | Total
Balance as of December 31, 2025 | $ | (209) |  |  | $ | 105 |  |  | $ | (1) |  |  | $ | (105) |
Other comprehensive loss before reclassifications, net of tax of $0 | — |  |  | (1) |  |  | — |  |  | (1) |
Amounts reclassified from accumulated other comprehensive income (loss): |  |  |  |  |  |  |
Amortization of prior service credit(a) | (2) |  |  | (5) |  |  | — |  |  | (7) |
Amortization of actuarial loss(a) | 4 |  |  | — |  |  | — |  |  | 4 |
Tax effect | — |  |  | 1 |  |  | — |  |  | 1 |
Other comprehensive income (loss) | 2 |  |  | (5) |  |  | — |  |  | (3) |
Balance as of March 31, 2026 | $ | (207) |  |  | $ | 100 |  |  | $ | (1) |  |  | $ | (108) |
(Millions of dollars) | Pension Benefits |  | Other Benefits |  | Other |  | Total
Balance as of December 31, 2024 | $ | (235) |  |  | $ | 122 |  |  | $ | (1) |  |  | $ | (114) |
Other comprehensive income before reclassifications, net of tax of $2 | 5 |  |  | 3 |  |  | — |  |  | 8 |
Amounts reclassified from accumulated other comprehensive income (loss): |  |  |  |  |  |  |
Amortization of prior service credit(a) | (2) |  |  | (6) |  |  | — |  |  | (8) |
Amortization of actuarial loss(a) | 4 |  |  | — |  |  | — |  |  | 4 |
Tax effect | — |  |  | 1 |  |  | — |  |  | 1 |
Other comprehensive income (loss) | 7 |  |  | (2) |  |  | — |  |  | 5 |
Balance as of March 31, 2025 | $ | (228) |  |  | $ | 120 |  |  | $ | (1) |  |  | $ | (109) |
(a)These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost. See Note 21.

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