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Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables)
 9 Months Ended
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of 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, 2022
 Fair ValueTotal
Unrealized
Gains		Total
Unrealized
Losses
Investment Type:Nuclear Decommissioning TrustsOther Special Use FundsTotal
Equity securities$440,971 $38,569 $479,540 $302,627 $(458)
Available for sale-fixed income securities579,693 319,702 899,395 (a)1,136 (87,618)
Other5,249 1,123 6,372 (b)— (25)
Total$1,025,913 $359,394 $1,385,307 $303,763 $(88,101)

(a)As of September 30, 2022, the amortized cost basis of these available-for-sale investments is $986 million.
(b)Represents net pending securities sales and purchases.

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.
Schedule of Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds
The following tables set 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
2022
Realized gains$788 $— $788 
Realized losses(6,908)— (6,908)
Proceeds from the sale of securities (a)153,573 65,244 218,817 
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 

(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
2022
Realized gains$8,093 $— $8,093 
Realized losses(26,582)— (26,582)
Proceeds from the sale of securities (a)783,232 127,255 910,487 
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 

(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.
Schedule of 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, 2022, is as follows (dollars in thousands):
 Nuclear Decommissioning TrustsCoal Reclamation Escrow AccountActive Union Employee Medical AccountTotal
Less than one year$16,334 $53,384 $59,724 $129,442 
1 year – 5 years184,936 34,386 161,376 380,698 
5 years – 10 years113,793 — 6,773 120,566 
Greater than 10 years264,630 4,059 — 268,689 
Total$579,693 $91,829 $227,873 $899,395