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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2025 |  | Three Months Ended March 31, 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 (loss) gain before reclassifications |  | (5) |  |  | — |  |  | (5) |  |  | 22 |  |  | — |  |  | 22 |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (a) | 1 |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |
Net current period other comprehensive (loss) income |  | (4) |  |  | — |  |  | (4) |  |  | 23 |  |  | — |  |  | 23 |
Accumulated other comprehensive loss at March 31 |  | $ | (33) |  |  | $ | (39) |  |  | $ | (72) |  |  | $ | (30) |  |  | $ | (41) |  |  | $ | (71) |
(a)Included in interest charges.

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