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Changes in Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2021
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of changes in accumulated other comprehensive loss including reclassification adjustments, net of tax, by component | 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
Three Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance March 31, 2021 | $ | (59,703) |  |  |  |  | $ | (1,809) |  |  |  |  | $ | (61,512) |
OCI (loss) before reclassifications | (1,125) |  |  |  |  | 870 |  |  |  |  | (255) |
Amounts reclassified from accumulated other comprehensive loss | 1,189 |  |  | (a) |  | — |  |  |  |  | 1,189 |
Balance June 30, 2021 | $ | (59,639) |  |  |  |  | $ | (939) |  |  |  |  | $ | (60,578) |
Balance March 31, 2020 | $ | (55,317) |  |  |  |  | $ | (262) |  |  |  |  | $ | (55,579) |
OCI (loss) before reclassifications | (2,008) |  |  |  |  | (1,549) |  |  |  |  | (3,557) |
Amounts reclassified from accumulated other comprehensive loss | 999 |  |  | (a) |  | 262 |  |  | (b) |  | 1,261 |
Balance June 30, 2020 | $ | (56,326) |  |  |  |  | $ | (1,549) |  |  |  |  | $ | (57,875) |
| Pension and Other Postretirement Benefits |  |  |  | Derivative Instruments |  |  |  | Total
Six Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance December 31, 2020 | $ | (60,725) |  |  |  |  | $ | (2,071) |  |  |  |  | $ | (62,796) |
OCI (loss) before reclassifications | (1,125) |  |  |  |  | 1,132 |  |  |  |  | 7 |
Amounts reclassified from accumulated other comprehensive loss | 2,211 |  |  | (a) |  | — |  |  |  |  | 2,211 |
Balance June 30, 2021 | $ | (59,639) |  |  |  |  | $ | (939) |  |  |  |  | $ | (60,578) |
Balance December 31, 2019 | $ | (56,522) |  |  |  |  | $ | (574) |  |  |  |  | $ | (57,096) |
OCI (loss) before reclassifications | (2,008) |  |  |  |  | (1,257) |  |  |  |  | (3,265) |
Amounts reclassified from accumulated other comprehensive loss | 2,204 |  |  | (a) |  | 282 |  |  | (b) |  | 2,486 |
Balance June 30, 2020 | $ | (56,326) |  |  |  |  | $ | (1,549) |  |  |  |  | $ | (57,875) |
(a) These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 5. (b) These amounts primarily represent realized gains and losses and are included in the computation of fuel and purchased power costs and are subject to the PSA. See Note 7. 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 |  |  |  | Derivative Instruments |  |  |  | Total
Three Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance March 31, 2021 | $ | (39,991) |  |  |  |  | $ | — |  |  |  |  | $ | (39,991) |
OCI (loss) before reclassifications | (914) |  |  |  |  | — |  |  |  |  | (914) |
Amounts reclassified from accumulated other comprehensive loss | 1,073 |  |  | (a) |  | — |  |  |  |  | 1,073 |
Balance June 30, 2021 | $ | (39,832) |  |  |  |  | $ | — |  |  |  |  | $ | (39,832) |
Balance March 31, 2020 | $ | (33,935) |  |  |  |  | $ | (262) |  |  |  |  | $ | (34,197) |
OCI (loss) before reclassifications | (1,951) |  |  |  |  | — |  |  |  |  | (1,951) |
Amounts reclassified from accumulated other comprehensive loss | 861 |  |  | (a) |  | 262 |  |  | (b) |  | 1,123 |
Balance June 30, 2020 | $ | (35,025) |  |  |  |  | $ | — |  |  |  |  | $ | (35,025) |
| Pension and Other Postretirement Benefits |  |  |  | Derivative Instruments |  |  |  | Total
Six Months Ended June 30 |  |  |  |  |  |  |  |  |
Balance December 31, 2020 | $ | (40,918) |  |  |  |  | $ | — |  |  |  |  | $ | (40,918) |
OCI (loss) before reclassifications | (914) |  |  |  |  | — |  |  |  |  | (914) |
Amounts reclassified from accumulated other comprehensive loss | 2,000 |  |  | (a) |  | — |  |  |  |  | 2,000 |
Balance June 30, 2021 | $ | (39,832) |  |  |  |  | $ | — |  |  |  |  | $ | (39,832) |
Balance December 31, 2019 | $ | (34,948) |  |  |  |  | $ | (574) |  |  |  |  | $ | (35,522) |
OCI (loss) before reclassifications | (1,951) |  |  |  |  | 292 |  |  |  |  | (1,659) |
Amounts reclassified from accumulated other comprehensive loss | 1,874 |  |  | (a) |  | 282 |  |  | (b) |  | 2,156 |
Balance June 30, 2020 | $ | (35,025) |  |  |  |  | $ | — |  |  |  |  | $ | (35,025) |
(a) These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 5. (b) These amounts primarily represent realized gains and losses and are included in the computation of fuel and purchased power costs and are subject to the PSA. See Note 7.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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