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Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables)
 6 Months Ended
Jun. 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):  
June 30, 2021
 Fair ValueTotal
Unrealized
Gains		Total
Unrealized
Losses
Investment Type:Nuclear Decommissioning TrustsOther Special Use FundsTotal
Equity securities$725,585 $19,904 $745,489 $510,432 $— 
Available for sale-fixed income securities507,009 337,580 844,589 (a)31,269 (1,357)
Other(9,506)952 (8,554)(b)— — 
Total$1,223,088 $358,436 $1,581,524 $541,701 $(1,357)

(a)As of June 30, 2021, the amortized cost basis of these available-for-sale investments is $815 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 June 30,
 Nuclear Decommissioning TrustsOther Special Use FundsTotal
2021
Realized gains$1,406 $— $1,406 
Realized losses(1,146)— (1,146)
Proceeds from the sale of securities (a)190,340 17,524 207,864 
2020
Realized gains$4,500 $— $4,500 
Realized losses(1,621)— (1,621)
Proceeds from the sale of securities (a)176,942 19,830 196,772 

(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.    
 Six Months Ended June 30,
 Nuclear Decommissioning TrustsOther Special Use FundsTotal
2021
Realized gains$4,374 $— $4,374 
Realized losses(5,294)— (5,294)
Proceeds from the sale of securities (a)425,068 162,774 587,842 
2020
Realized gains$7,813 $— $7,813 
Realized losses(3,848)— (3,848)
Proceeds from the sale of securities (a)355,138 36,721 391,859 
(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 June 30, 2021, is as follows (dollars in thousands):
 Nuclear Decommissioning TrustCoal Reclamation Escrow AccountActive Union Employee Medical AccountTotal
Less than one year$28,151 $26,123 $40,263 $94,537 
1 year – 5 years133,054 35,880 162,728 331,662 
5 years – 10 years131,462 2,676 61,288 195,426 
Greater than 10 years214,342 8,622 — 222,964 
Total$507,009 $73,301 $264,279 $844,589