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Other Comprehensive Income (Loss) | 9 Months Ended
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Sep. 30, 2025
Stockholders' Equity Note [Abstract] |
Other Comprehensive Income (Loss) | Changes in accumulated other comprehensive loss, net of tax:
|  | Three Months Ended Sept. 30, 2025 |  | Three Months Ended Sept. 30, 2024
(Millions of Dollars) |  | Gains and Losses on Cash Flow Hedges |  | Defined Benefit Pension and Postretirement Items |  | Total |  | Gains and Losses on Cash Flow Hedges |  | Defined Benefit Pension and Postretirement Items |  | Total
Accumulated other comprehensive loss at July 1 |  | $ | (27) |  |  | $ | (39) |  |  | $ | (66) |  |  | $ | (30) |  |  | $ | (37) |  |  | $ | (67) |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (a) | 1 |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |
Net current period other comprehensive income |  | 1 |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |
Accumulated other comprehensive loss at Sept. 30 |  | $ | (26) |  |  | $ | (39) |  |  | $ | (65) |  |  | $ | (29) |  |  | $ | (37) |  |  | $ | (66) |
|  | Nine Months Ended Sept. 30, 2025 |  | Nine Months Ended Sept. 30, 2024
(Millions of Dollars) |  | Gains and Losses on Cash Flow Hedges |  | Defined Benefit Pension and Postretirement Items |  | Total |  | Gains and Losses on Cash Flow Hedges |  | Defined Benefit Pension and Postretirement Items |  | Total
Accumulated other comprehensive loss at Jan. 1 |  | $ | (29) |  |  | $ | (39) |  |  | $ | (68) |  |  | $ | (53) |  |  | $ | (41) |  |  | $ | (94) |
Other comprehensive gain before reclassifications |  | — |  |  | — |  |  | — |  |  | 22 |  |  | — |  |  | 22 |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (a) | 3 |  |  | — |  |  | 3 |  |  | 2 |  |  | — |  |  | 2 |
Amortization of net actuarial losses (b) |  | — |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | 4 |
Net current period other comprehensive income |  | 3 |  |  | — |  |  | 3 |  |  | 24 |  |  | 4 |  |  | 28 |
Accumulated other comprehensive loss at Sept. 30 |  | $ | (26) |  |  | $ | (39) |  |  | $ | (65) |  |  | $ | (29) |  |  | $ | (37) |  |  | $ | (66) |
(a)Included in interest charges. (b)Included in the computation of net periodic pension and postretirement benefit costs. See Note 9 for further information.

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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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