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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2022
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 three and six months ended June 30, 2022 and 2021:
|  | Three Months Ended June 30, 2022 |  | Three Months Ended June 30, 2021
(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 April 1 |  | $ | (69) |  |  | $ | (47) |  |  | $ | (116) |  |  | $ | (82) |  |  | $ | (56) |  |  | $ | (138) |
Other comprehensive gain before reclassifications |  | 11 |  |  | — |  |  | 11 |  |  | — |  |  | — |  |  | — |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (a) | 1 |  |  | — |  |  | 1 |  |  | 2 |  |  | — |  |  | 2 |
Amortization of net actuarial loss (b) |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |  |  | 1 |
Net current period other comprehensive income |  | 12 |  |  | 1 |  |  | 13 |  |  | 2 |  |  | 1 |  |  | 3 |
Accumulated other comprehensive loss at June 30 |  | $ | (57) |  |  | $ | (46) |  |  | $ | (103) |  |  | $ | (80) |  |  | $ | (55) |  |  | $ | (135) |
|  | Six Months Ended June 30, 2022 |  | Six Months Ended June 30, 2021
(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 |  | $ | (75) |  |  | $ | (48) |  |  | $ | (123) |  |  | $ | (85) |  |  | $ | (56) |  |  | $ | (141) |
Other comprehensive gain before reclassifications |  | 16 |  |  | — |  |  | 16 |  |  | — |  |  | — |  |  | — |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (a) |  | 2 |  |  | — |  |  | 2 |  |  | 5 |  |  | — |  |  | 5 |
Amortization of net actuarial loss (b) |  | — |  |  | 2 |  |  | 2 |  |  | — |  |  | 1 |  |  | 1 |
Net current period other comprehensive income |  | 18 |  |  | 2 |  |  | 20 |  |  | 5 |  |  | 1 |  |  | 6 |
Accumulated other comprehensive loss at June 30 |  | $ | (57) |  |  | $ | (46) |  |  | $ | (103) |  |  | $ | (80) |  |  | $ | (55) |  |  | $ | (135) |
(a)Included in interest charges. (b)Included in the computation of net periodic pension and postretirement benefit costs.

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