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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2025
Stockholders' Equity Note [Abstract] |
Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax | Changes in accumulated other comprehensive loss, net of tax:
|  | Three Months Ended June 30, 2025 |  | Three Months Ended June 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 April 1 |  | $ | (33) |  |  | $ | (39) |  |  | $ | (72) |  |  | $ | (30) |  |  | $ | (41) |  |  | $ | (71) |
Other comprehensive gain before reclassifications |  | 5 |  |  | — |  |  | 5 |  |  | — |  |  | — |  |  | — |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (a) | 1 |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |
Amortization of net actuarial losses (b) |  | — |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | 4 |
Net current period other comprehensive income |  | 6 |  |  | — |  |  | 6 |  |  | — |  |  | 4 |  |  | 4 |
Accumulated other comprehensive loss at June 30 |  | $ | (27) |  |  | $ | (39) |  |  | $ | (66) |  |  | $ | (30) |  |  | $ | (37) |  |  | $ | (67) |
|  | Six Months Ended June 30, 2025 |  | Six Months Ended June 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) | 2 |  |  | — |  |  | 2 |  |  | 1 |  |  | — |  |  | 1 |
Amortization of net actuarial losses (b) |  | — |  |  | — |  |  | — |  |  | — |  |  | 4 |  |  | 4 |
Net current period other comprehensive income |  | 2 |  |  | — |  |  | 2 |  |  | 23 |  |  | 4 |  |  | 27 |
Accumulated other comprehensive loss at June 30 |  | $ | (27) |  |  | $ | (39) |  |  | $ | (66) |  |  | $ | (30) |  |  | $ | (37) |  |  | $ | (67) |
(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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