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Changes in Accumulated Other Comprehensive Loss | 3 Months Ended
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Mar. 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 tables show 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
Three Months Ended March 31 |  |  |  |  |  |  |  |  |
Balance December 31, 2022 | $ | (32,332) |  |  |  |  | $ | 897 |  |  |  |  | $ | (31,435) |
OCI (loss) before reclassifications | — |  |  |  |  | (616) |  |  |  |  | (616) |
Amounts reclassified from accumulated other comprehensive loss | 515 |  |  | (a) |  | — |  |  |  |  | 515 |
Balance March 31, 2023 | $ | (31,817) |  |  |  |  | $ | 281 |  |  |  |  | $ | (31,536) |
Balance December 31, 2021 | $ | (53,885) |  |  |  |  | $ | (976) |  |  |  |  | $ | (54,861) |
OCI (loss) before reclassifications | — |  |  |  |  | 252 |  |  |  |  | 252 |
Amounts reclassified from accumulated other comprehensive loss | 901 |  |  | (a) |  | — |  |  |  |  | 901 |
Balance March 31, 2022 | $ | (52,984) |  |  |  |  | $ | (724) |  |  |  |  | $ | (53,708) |
(a) These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 5. The following tables show 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 |  |  |  |  |  |  |  |
Three Months Ended March 31 |  |  |  |  |  |  |  |  |
Balance December 31, 2022 | $ | (15,596) |  |  |  |  |  |  |  |  |
OCI (loss) before reclassifications | — |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 457 |  |  | (a) |  |  |  |  |  |
Balance March 31, 2023 | $ | (15,139) |  |  |  |  |  |  |  |  |
Balance December 31, 2021 | $ | (34,880) |  |  |  |  |  |  |  |  |
OCI (loss) before reclassifications | — |  |  |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive loss | 820 |  |  | (a) |  |  |  |  |  |
Balance March 31, 2022 | $ | (34,060) |  |  |  |  |  |  |  |  |
(a) These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 5.

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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 https://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 https://asc.fasb.org/extlink&oid=126953954&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 https://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 https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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