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Pension and Other Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2025
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Costs | The following summarizes the components of net periodic benefit costs:
| Three Months Ended June 30, |  | Six Months Ended June 30,
(Millions of dollars) | 2025 |  | 2024 |  | 2025 |  | 2024
Pension Benefits |  |  |  |  |  |  |
Service cost | $ | 57 |  |  | $ | 53 |  |  | $ | 112 |  |  | $ | 107 |
Interest cost | 35 |  |  | 31 |  |  | 72 |  |  | 61 |
Expected return on plan assets | (35) |  |  | (37) |  |  | (72) |  |  | (74) |
Amortization of prior service credit | (2) |  |  | (8) |  |  | (4) |  |  | (16) |
Amortization of actuarial loss | 4 |  |  | 1 |  |  | 8 |  |  | 2 |
Settlement loss | 1 |  |  | — |  |  | 1 |  |  | — |
Net periodic pension benefit cost | $ | 60 |  |  | $ | 40 |  |  | $ | 117 |  |  | $ | 80 |
Other Benefits |  |  |  |  |  |  |
Service cost | $ | 5 |  |  | $ | 5 |  |  | $ | 10 |  |  | $ | 10 |
Interest cost | 8 |  |  | 8 |  |  | 17 |  |  | 16 |
Amortization of prior service credit | (5) |  |  | (6) |  |  | (11) |  |  | (11) |
Net periodic other benefit cost | $ | 8 |  |  | $ | 7 |  |  | $ | 16 |  |  | $ | 15 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (q) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-5 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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