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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2024
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 Sept. 30, 2024 |  | Three Months Ended Sept. 30, 2023
(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 |  | $ | (30) |  |  | $ | (37) |  |  | $ | (67) |  |  | $ | (44) |  |  | $ | (38) |  |  | $ | (82) |
Other comprehensive gain before reclassifications |  | — |  |  | — |  |  | — |  |  | 3 |  |  | — |  |  | 3 |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (a) | 1 |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |
Net current period other comprehensive income |  | 1 |  |  | — |  |  | 1 |  |  | 4 |  |  | — |  |  | 4 |
Accumulated other comprehensive loss at Sept. 30 |  | $ | (29) |  |  | $ | (37) |  |  | $ | (66) |  |  | $ | (40) |  |  | $ | (38) |  |  | $ | (78) |
|  | Nine Months Ended Sept. 30, 2024 |  | Nine Months Ended Sept. 30, 2023
(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 |  | $ | (53) |  |  | $ | (41) |  |  | $ | (94) |  |  | $ | (54) |  |  | $ | (39) |  |  | $ | (93) |
Other comprehensive gain before reclassifications |  | 22 |  |  | — |  |  | 22 |  |  | 11 |  |  | — |  |  | 11 |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (a) |  | 2 |  |  | — |  |  | 2 |  |  | 3 |  |  | — |  |  | 3 |
Amortization of net actuarial losses (b) |  | — |  |  | 4 |  |  | 4 |  |  | — |  |  | 1 |  |  | 1 |
Net current period other comprehensive income |  | 24 |  |  | 4 |  |  | 28 |  |  | 14 |  |  | 1 |  |  | 15 |
Accumulated other comprehensive loss at Sept. 30 |  | $ | (29) |  |  | $ | (37) |  |  | $ | (66) |  |  | $ | (40) |  |  | $ | (38) |  |  | $ | (78) |
(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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