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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 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 :
|  | Three Months Ended March 31, 2023 |  | Three Months Ended March 31, 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 (loss) gain before reclassifications |  | (5) |  |  | — |  |  | (5) |  |  | 5 |  |  | — |  |  | 5 |
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 (loss) income |  | (4) |  |  | — |  |  | (4) |  |  | 6 |  |  | 1 |  |  | 7 |
Accumulated other comprehensive loss at March 31 |  | $ | (58) |  |  | $ | (39) |  |  | $ | (97) |  |  | $ | (69) |  |  | $ | (47) |  |  | $ | (116) |
(a)Included in interest charges. (b)Included in the computation of net periodic pension and postretirement benefit costs.

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