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Accumulated Other Comprehensive Income (Loss) | 3 Months Ended
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Mar. 31, 2026
Equity [Abstract] |
Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Income (Loss) 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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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