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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2021
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 nine months ended Sept. 30, 2021 and 2020:
|  | Three Months Ended Sept. 30, 2021 |  | Three Months Ended Sept. 30, 2020
(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 |  | $ | (80) |  |  | $ | (55) |  |  | $ | (135) |  |  | $ | (87) |  |  | $ | (58) |  |  | $ | (145) |
Other comprehensive gain before reclassifications (net of taxes of $1, $—, $— and $—, respectively) |  | 3 |  |  | — |  |  | 3 |  |  | — |  |  | — |  |  | — |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (net of taxes of $—, $—, $— and $—, respectively) (a) | 2 |  |  | — |  |  | 2 |  |  | 1 |  |  | — |  |  | 1 |
Amortization of net actuarial loss (net of taxes of $—, $1, $— and $—, respectively) (b) |  | — |  |  | 4 |  |  | 4 |  |  | — |  |  | 1 |  |  | 1 |
Net current period other comprehensive income |  | 5 |  |  | 4 |  |  | 9 |  |  | 1 |  |  | 1 |  |  | 2 |
Accumulated other comprehensive loss at Sept. 30 |  | $ | (75) |  |  | $ | (51) |  |  | $ | (126) |  |  | $ | (86) |  |  | $ | (57) |  |  | $ | (143) |
|  | Nine Months Ended Sept. 30, 2021 |  | Nine Months Ended Sept. 30, 2020
(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 |  | $ | (85) |  |  | $ | (56) |  |  | $ | (141) |  |  | $ | (80) |  |  | $ | (61) |  |  | $ | (141) |
Other comprehensive gain (loss) before reclassifications (net of taxes of $1, $—, $(3) and $—, respectively) |  | 4 |  |  | — |  |  | 4 |  |  | (10) |  |  | — |  |  | (10) |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (net of taxes of $1, $—, $1 and $—, respectively) (a) |  | 6 |  |  | — |  |  | 6 |  |  | 4 |  |  | — |  |  | 4 |
Amortization of net actuarial loss (net of taxes of $—, $2, $— and $1, respectively) (b) |  | — |  |  | 5 |  |  | 5 |  |  | — |  |  | 4 |  |  | 4 |
Net current period other comprehensive income (loss) |  | 10 |  |  | 5 |  |  | 15 |  |  | (6) |  |  | 4 |  |  | (2) |
Accumulated other comprehensive loss at Sept. 30 |  | $ | (75) |  |  | $ | (51) |  |  | $ | (126) |  |  | $ | (86) |  |  | $ | (57) |  |  | $ | (143) |
(a)Included in interest charges. (b)Included in the computation of net periodic pension and postretirement benefit costs.

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