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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023 |  | Three Months Ended Sept. 30, 2022
(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 |  | $ | (44) |  |  | $ | (38) |  |  | $ | (82) |  |  | $ | (57) |  |  | $ | (46) |  |  | $ | (103) |
Other comprehensive gain before reclassifications |  | 3 |  |  | — |  |  | 3 |  |  | — |  |  | 10 |  |  | 10 |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (a) | 1 |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |
Amortization of net actuarial loss (b) |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | 1 |
Net current period other comprehensive income |  | 4 |  |  | — |  |  | 4 |  |  | 1 |  |  | 11 |  |  | 12 |
Accumulated other comprehensive loss at Sept. 30 |  | $ | (40) |  |  | $ | (38) |  |  | $ | (78) |  |  | $ | (56) |  |  | $ | (35) |  |  | $ | (91) |
|  | Nine Months Ended Sept. 30, 2023 |  | Nine Months Ended Sept. 30, 2022
(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 |  | $ | (54) |  |  | $ | (39) |  |  | $ | (93) |  |  | $ | (75) |  |  | $ | (48) |  |  | $ | (123) |
Other comprehensive gain before reclassifications |  | 11 |  |  | — |  |  | 11 |  |  | 15 |  |  | 11 |  |  | 26 |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (a) |  | 3 |  |  | — |  |  | 3 |  |  | 4 |  |  | — |  |  | 4 |
Amortization of net actuarial loss (b) |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | 2 |  |  | 2 |
Net current period other comprehensive income |  | 14 |  |  | 1 |  |  | 15 |  |  | 19 |  |  | 13 |  |  | 32 |
Accumulated other comprehensive loss at Sept. 30 |  | $ | (40) |  |  | $ | (38) |  |  | $ | (78) |  |  | $ | (56) |  |  | $ | (35) |  |  | $ | (91) |
(a)Included in interest charges. (b)Included in the computation of net periodic pension and postretirement benefit costs.

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