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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2023
Stockholders' Equity Note [Abstract] |
Changes in Accumulated Other Comprehensive Income (Loss), Net of Tax | Changes in accumulated other comprehensive loss, net of tax, for the years ended Dec. 31:
|  | 2023
(Millions of Dollars) |  | Gains and Losses on Interest Rate Cash Flow Hedges |  | Defined Benefit Pension and Postretirement Items |  | Total
Accumulated other comprehensive loss at Jan. 1 |  | $ | (54) |  |  | $ | (39) |  |  | $ | (93) |
Other comprehensive loss before reclassifications |  | (2) |  |  | (4) |  |  | (6) |
Losses reclassified from net accumulated other comprehensive loss:
Amortization of interest rate hedges |  | 3 |  | (a) | — |  |  | 3 |
Amortization of net actuarial loss |  | — |  |  | 2 |  | (b) | 2 |
Net current period other comprehensive income (loss) |  | 1 |  |  | (2) |  |  | (1) |
Accumulated other comprehensive loss at Dec. 31 |  | $ | (53) |  |  | $ | (41) |  |  | $ | (94) |
(a)Included in interest charges. (b)Included in the computation of net periodic pension and postretirement benefit costs. See Note 11 for further information.
|  | 2022
(Millions of Dollars) |  | Gains and Losses on Interest Rate Cash Flow Hedges |  | Defined Benefit Pension and Postretirement Items |  | Total
Accumulated other comprehensive loss at Jan. 1 |  | $ | (75) |  |  | $ | (48) |  |  | $ | (123) |
Other comprehensive gain before reclassifications |  | 16 |  |  | 5 |  |  | 21 |
Losses reclassified from net accumulated other comprehensive loss:
Amortization of interest rate hedges |  | 5 |  | (a) | — |  |  | 5 |
Amortization of net actuarial loss |  | — |  |  | 4 |  | (b) | 4 |
Net current period other comprehensive income |  | 21 |  |  | 9 |  |  | 30 |
Accumulated other comprehensive loss at Dec. 31 |  | $ | (54) |  |  | $ | (39) |  |  | $ | (93) |
(a)Included in interest charges. (b)Included in the computation of net periodic pension and postretirement benefit costs. See Note 11 for further information.

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