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Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables)
 9 Months Ended
Sep. 30, 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):  
September 30, 2021
 Fair ValueTotal
Unrealized
Gains		Total
Unrealized
Losses
Investment Type:Nuclear Decommissioning TrustsOther Special Use FundsTotal
Equity securities$739,740 $25,071 $764,811 $511,895 $(27)
Available for sale-fixed income securities509,288 348,380 857,668 (a)27,218 (1,763)
Other(23,543)1,392 (22,151)(b)— — 
Total$1,225,485 $374,843 $1,600,328 $539,113 $(1,790)

(a)As of September 30, 2021, the amortized cost basis of these available-for-sale investments is $832 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):
 Three Months Ended September 30,
 Nuclear Decommissioning TrustsOther Special Use FundsTotal
2021
Realized gains$1,652 $— $1,652 
Realized losses(1,555)(7)(1,562)
Proceeds from the sale of securities (a)181,728 27,608 209,336 
2020
Realized gains$2,933 $— $2,933 
Realized losses(750)(15)(765)
Proceeds from the sale of securities (a)178,919 37,107 216,026 

(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.    

 Nine Months Ended September 30,
 Nuclear Decommissioning TrustsOther Special Use FundsTotal
2021
Realized gains$6,026 $— $6,026 
Realized losses(6,849)(7)(6,856)
Proceeds from the sale of securities (a)606,796 190,382 797,178 
2020
Realized gains$10,746 $— $10,746 
Realized losses(4,598)(15)(4,613)
Proceeds from the sale of securities (a)534,057 73,828 607,885 
(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 September 30, 2021, is as follows (dollars in thousands):
 Nuclear Decommissioning TrustCoal Reclamation Escrow AccountActive Union Employee Medical AccountTotal
Less than one year$22,350 $30,762 $40,060 $93,172 
1 year – 5 years146,918 43,898 201,342 392,158 
5 years – 10 years127,053 1,797 22,011 150,861 
Greater than 10 years212,967 8,510 — 221,477 
Total$509,288 $84,967 $263,413 $857,668