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Changes in Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2021
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 InstrumentsTotal
Balance at December 31, 2019$(56,522)$(574)$(57,096)
OCI (loss) before reclassifications(8,370)(2,089)(10,459)
Amounts reclassified from accumulated other comprehensive loss4,167 (a)592 (b)4,759 
Balance at December 31, 2020(60,725)(2,071)(62,796)
OCI (loss) before reclassifications2,439 1,077 3,516 
Amounts reclassified from accumulated other comprehensive loss4,401 (a)18 (b)4,419 
Balance at December 31, 2021$(53,885)$(976)$(54,861)
(a)These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 8.
(b)These amounts 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 16.
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 Derivative InstrumentsTotal
Balance at December 31, 2019$(34,948)$(574)$(35,522)
OCI (loss) before reclassifications(9,568)(18)(9,586)
Amounts reclassified from accumulated other comprehensive loss3,598 (a)592 (b)4,190 
Balance at December 31, 2020(40,918)— (40,918)
OCI (loss) before reclassifications2,043 (18)2,025 
Amounts reclassified from accumulated other comprehensive loss3,995 (a)18 (b)4,013 
Balance at December 31, 2021$(34,880)$— $(34,880)
(a)These amounts primarily represent amortization of actuarial loss and are included in the computation of net periodic pension cost. See Note 8.
(b)These amounts 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 16.