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Other Comprehensive Income (Loss) | 9 Months Ended
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Sep. 30, 2020
Stockholders' Equity Note [Abstract] |
Other Comprehensive Income (Loss) | Changes in accumulated other comprehensive loss, net of tax, for the three and nine months ended Sept. 30, 2020 and 2019:
|  | Three Months Ended Sept. 30, 2020 |  | Three Months Ended Sept. 30, 2019
(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 |  | $ | (87) |  |  | $ | (58) |  |  | $ | (145) |  |  | $ | (75) |  |  | $ | (60) |  |  | $ | (135) |
Other comprehensive loss before reclassifications (net of taxes of $—, $—, $(3) and $—, respectively) |  | — |  |  | — |  |  | — |  |  | (9) |  |  | — |  |  | (9) |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (net of taxes of $—) (a) |  | 1 |  |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |
Amortization of net actuarial loss (net of taxes of $—) (b) |  | — |  |  | 1 |  |  | 1 |  |  | — |  |  | 1 |  |  | 1 |
Net current period other comprehensive income (loss) |  | 1 |  |  | 1 |  |  | 2 |  |  | (8) |  |  | 1 |  |  | (7) |
Accumulated other comprehensive loss at Sept. 30 |  | $ | (86) |  |  | $ | (57) |  |  | $ | (143) |  |  | $ | (83) |  |  | $ | (59) |  |  | $ | (142) |
|  | Nine Months Ended Sept. 30, 2020 |  | Nine Months Ended Sept. 30, 2019
(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 |  | $ | (80) |  |  | $ | (61) |  |  | $ | (141) |  |  | $ | (60) |  |  | $ | (64) |  |  | $ | (124) |
Other comprehensive (loss) gain before reclassifications (net of taxes of $(3), $—, $(9) and $1, respectively) |  | (10) |  |  | — |  |  | (10) |  |  | (25) |  |  | 2 |  |  | (23) |
Losses reclassified from net accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate derivatives (net of taxes of $1, $—, $1 and $—, respectively) (a) |  | 4 |  |  | — |  |  | 4 |  |  | 2 |  |  | — |  |  | 2 |
Amortization of net actuarial loss (net of taxes of $—, $1, $— and $1, respectively) (b) |  | — |  |  | 4 |  |  | 4 |  |  | — |  |  | 3 |  |  | 3 |
Net current period other comprehensive (loss) income |  | (6) |  |  | 4 |  |  | (2) |  |  | (23) |  |  | 5 |  |  | (18) |
Accumulated other comprehensive loss at Sept. 30 |  | $ | (86) |  |  | $ | (57) |  |  | $ | (143) |  |  | $ | (83) |  |  | $ | (59) |  |  | $ | (142) |
(a)Included in interest charges. (b)Included in the computation of net periodic pension and postretirement benefit costs.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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