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Changes in Accumulated Other Comprehensive Loss | 12 Months Ended
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Dec. 31, 2023
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Changes in Accumulated Other Comprehensive Loss | Changes in Accumulated Other Comprehensive Loss The following table shows the changes in Pinnacle West’s consolidated accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component (dollars in thousands):
| Pension and Other Postretirement Benefits |  |  |  | Derivative Instruments |  |  |  | Total
Balance at December 31, 2021 | $ | (53,885) |  |  |  |  | $ | (976) |  |  |  |  | $ | (54,861) |
OCI (loss) before reclassifications | 17,550 |  |  |  |  | 1,873 |  |  |  |  | 19,423 |
Amounts reclassified from accumulated other comprehensive loss | 4,003 |  |  | (a) |  | — |  |  |  |  | 4,003 |
Balance at December 31, 2022 | (32,332) |  |  |  |  | 897 |  |  |  |  | (31,435) |
OCI (loss) before reclassifications | (4,420) |  |  |  |  | 713 |  |  |  |  | (3,707) |
Amounts reclassified from accumulated other comprehensive loss | 1,998 |  |  | (a) |  | — |  |  |  |  | 1,998 |
Balance at December 31, 2023 | $ | (34,754) |  |  |  |  | $ | 1,610 |  |  |  |  | $ | (33,144) |
(a)These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 7. Changes in Accumulated Other Comprehensive Loss — APS The following table shows the changes in APS’s consolidated accumulated other comprehensive loss, including reclassification adjustments, net of tax, by component (dollars in thousands):
| Pension and Other Postretirement Benefits |  |  |  |  |  |  | Total
Balance at December 31, 2021 | $ | (34,880) |  |  |  |  |  |  |  | $ | (34,880) |
OCI (loss) before reclassifications | 15,646 |  |  |  |  |  |  |  | 15,646 |
Amounts reclassified from accumulated other comprehensive loss | 3,638 |  |  | (a) |  |  |  |  | 3,638 |
Balance at December 31, 2022 | (15,596) |  |  |  |  |  |  |  | (15,596) |
OCI (loss) before reclassifications | (3,383) |  |  |  |  |  |  |  | (3,383) |
Amounts reclassified from accumulated other comprehensive loss | 1,760 |  |  | (a) |  |  |  |  | 1,760 |
Balance at December 31, 2023 | $ | (17,219) |  |  |  |  |  |  |  | $ | (17,219) |
(a)These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 7.

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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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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