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Benefit Plans and Other Postretirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2025
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Cost (Credit) | Components of Net Periodic Benefit Cost (Credit)
|  | Three Months Ended March 31
|  | 2025 |  | 2024 |  | 2025 |  | 2024
(Millions of Dollars) |  | Pension Benefits |  | Postretirement Health Care Benefits
Service cost |  | $ | 19 |  |  | $ | 19 |  |  | $ | — |  |  | $ | — |
Interest cost (a) |  | 39 |  |  | 38 |  |  | 6 |  |  | 5 |
Expected return on plan assets (a) |  | (52) |  |  | (52) |  |  | (5) |  |  | (4) |
Amortization of net loss (a) |  | 7 |  |  | 7 |  |  | 1 |  |  | 1 |
Net periodic benefit cost |  | 13 |  |  | 12 |  |  | 2 |  |  | 2 |
Effects of regulation |  | 2 |  |  | 4 |  |  | — |  |  | — |
Net benefit cost recognized for financial reporting |  | $ | 15 |  |  | $ | 16 |  |  | $ | 2 |  |  | $ | 2 |
(a)The components of net periodic cost other than the service cost component are included in the line item “Other income, net” in the consolidated statements of income or capitalized on the consolidated balance sheets as a regulatory asset.

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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://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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