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Accumulated Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2025
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, 2023 | $ | (261) |  |  | $ | 129 |  |  | $ | 1 |  |  | $ | (131) |
Other comprehensive income (loss) before reclassifications, net of tax of $(1) | 2 |  |  | (1) |  |  | (3) |  |  | (2) |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |  |  |  |
Amortization of prior service credit(a) | (16) |  |  | (11) |  |  | — |  |  | (27) |
Amortization of actuarial loss(a) | 2 |  |  | — |  |  | — |  |  | 2 |
Tax effect | 3 |  |  | 3 |  |  | — |  |  | 6 |
Other comprehensive loss | (9) |  |  | (9) |  |  | (3) |  |  | (21) |
Balance as of June 30, 2024 | $ | (270) |  |  | $ | 120 |  |  | $ | (2) |  |  | $ | (152) |
(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 $3 | 8 |  |  | 2 |  |  | — |  |  | 10 |
Amounts reclassified from accumulated other comprehensive loss: |  |  |  |  |  |  |
Amortization of prior service credit(a) | (4) |  |  | (11) |  |  | — |  |  | (15) |
Amortization of actuarial loss(a) | 8 |  |  | — |  |  | — |  |  | 8 |
Settlement loss(a) | 1 |  |  | — |  |  | — |  |  | 1 |
Other | — |  |  | — |  |  | 1 |  |  | 1 |
Tax effect | (2) |  |  | 3 |  |  | — |  |  | 1 |
Other comprehensive income (loss) | 11 |  |  | (6) |  |  | 1 |  |  | 6 |
Balance as of June 30, 2025 | $ | (224) |  |  | $ | 116 |  |  | $ | — |  |  | $ | (108) |
(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 Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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