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Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables)
 12 Months Ended
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Fair value of APS's nuclear decommissioning trust fund assets
The following tables present the unrealized gains and losses based on the original cost of the investment and summarizes the fair value of APS’s nuclear decommissioning trusts and other special use fund assets (dollars in thousands): 
December 31, 2021
 Fair ValueTotal
Unrealized
Gains		Total
Unrealized
Losses
Investment Type:Nuclear Decommissioning TrustsOther Special Use FundsTotal
Equity securities$640,312 $47,570 $687,882 $451,387 $— 
Available for sale-fixed income securities682,227 309,904 992,131 (a)24,283 (4,063)
Other(27,782)936 (26,846)(b)— — 
Total$1,294,757 $358,410 $1,653,167 $475,670 $(4,063)
(a)As of December 31, 2021, the amortized cost basis of these available-for-sale investments is $972 million.
(b)Represents net pending securities sales and purchases.

December 31, 2020
 Fair ValueTotal
Unrealized
Gains		Total
Unrealized
Losses
Investment Type:Nuclear Decommissioning TrustsOther Special Use FundsTotal
Equity securities$639,851 $37,337 $677,188 $421,666 $— 
Available for sale-fixed income securities516,412 216,668 733,080 (a)46,581 (398)
Other(17,828)504 (17,324)(b)— — 
Total$1,138,435 $254,509 $1,392,944 $468,247 $(398)
(a)As of December 31, 2020, the amortized cost basis of these available-for-sale investments is $687 million.
(b)Represents net pending securities sales and purchases.
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
The following table sets forth APS’s realized gains and losses relating to the sale and maturity of available-for-sale debt securities and equity securities, and the proceeds from the sale and maturity of these investment securities (dollars in thousands):
 
 Year Ended December 31,
 Nuclear Decommissioning TrustsOther Special Use FundsTotal
2021
Realized gains$134,610 $49 $134,659 
Realized losses(8,431)(7)(8,438)
Proceeds from the sale of securities (a)1,457,305 263,661 1,720,966 
2020
Realized gains12,194 176 12,370 
Realized losses(5,553)(15)(5,568)
Proceeds from the sale of securities (a)675,035 144,484 819,519 
2019
Realized gains11,024 108 11,132 
Realized losses(6,972)— (6,972)
Proceeds from the sale of securities (a)473,806 245,228 719,034 
(a)Proceeds are reinvested in the nuclear decommissioning trusts and other special use funds, excluding amounts reimbursed to the Company for active union employee medical claims from the active union employee medical account.
Fair value of fixed income securities, summarized by contractual maturities
The fair value of APS’s fixed income securities, summarized by contractual maturities, at December 31, 2021, is as follows (dollars in thousands):
 
 Nuclear Decommissioning TrustsCoal Reclamation Escrow AccountActive Union Employee Medical AccountTotal
Less than one year$31,070 $36,852 $40,870 $108,792 
1 year – 5 years195,975 41,931 158,235 396,141 
5 years – 10 years155,202 1,775 21,846 178,823 
Greater than 10 years299,980 8,395 — 308,375 
Total$682,227 $88,953 $220,951 $992,131