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Investments in Nuclear Decommissioning Trusts and Other Special Use Funds - Schedule of Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Variable Interest Entity | Pinnacle West Captive Insurance Cell |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Special use fund | $ 46,000 |  | $ 46,000 |  | $ 40,000
APS |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Total | 1,899,827 |  | 1,899,827 |  | 1,848,993
Total Unrealized Gains |  |  | 488,251 |  | 451,809
Total Unrealized Losses |  |  | (16,054) |  | (14,994)
Amortized cost | 1,272,000 |  | 1,272,000 |  | 1,265,000
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds |  |  |  |  |
Realized gains | 2,659 | $ 1,702 | 7,395 | $ 3,360 |
Realized losses | (4,656) | (2,611) | (7,453) | (5,372) |
Proceeds from the sale of securities | 485,393 | 433,830 | 997,627 | 919,644 |
APS | Nuclear Decommissioning Trusts |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Total | 1,467,958 |  | 1,467,958 |  | 1,414,166
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds |  |  |  |  |
Realized gains | 2,505 | 1,702 | 7,225 | 3,360 |
Realized losses | (4,656) | (2,611) | (7,453) | (5,372) |
Proceeds from the sale of securities | 403,032 | 342,313 | 850,915 | 758,914 |
APS | Other Special Use Funds |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Total | 431,869 |  | 431,869 |  | 434,827
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds |  |  |  |  |
Realized gains | 154 | 0 | 170 | 0 |
Realized losses | 0 | 0 | 0 | 0 |
Proceeds from the sale of securities | 82,361 | 91,517 | 146,712 | 160,730 |
APS | Captive Insurance Cell |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Total Unrealized Gains |  |  | 3,700 |  | 3,200
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds |  |  |  |  |
Proceeds from the sale of securities | 5,800 | $ 25,200 | 5,800 | $ 50,500 |
APS | Equity securities |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Equity securities | 618,526 |  | 618,526 |  | 582,135
Total Unrealized Gains |  |  | 478,401 |  | 433,044
Total Unrealized Losses |  |  | (6) |  | (1)
APS | Equity securities | Nuclear Decommissioning Trusts |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Equity securities | 563,582 |  | 563,582 |  | 519,562
APS | Equity securities | Other Special Use Funds |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Equity securities | 54,944 |  | 54,944 |  | 62,573
APS | Equity securities | Other Special Use Funds | Pinnacle West Captive Insurance Cell |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Special use fund | 42,200 |  | 42,200 |  | 40,300
APS | Available for sale-fixed income securities |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Available for sale-fixed income securities | 1,265,362 |  | 1,265,362 |  | 1,267,458
Total Unrealized Gains |  |  | 9,369 |  | 18,765
Total Unrealized Losses |  |  | (16,048) |  | (14,993)
Fair value of fixed income securities, summarized by contractual maturities |  |  |  |  |
Less than one year | 169,807 |  | 169,807 |  |
1 year – 5 years | 495,063 |  | 495,063 |  |
5 years – 10 years | 228,670 |  | 228,670 |  |
Greater than 10 years | 371,822 |  | 371,822 |  |
Total | 1,265,362 |  | 1,265,362 |  |
APS | Available for sale-fixed income securities | Nuclear Decommissioning Trusts |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Available for sale-fixed income securities | 895,405 |  | 895,405 |  | 898,403
Fair value of fixed income securities, summarized by contractual maturities |  |  |  |  |
Less than one year | 28,346 |  | 28,346 |  |
1 year – 5 years | 282,988 |  | 282,988 |  |
5 years – 10 years | 212,249 |  | 212,249 |  |
Greater than 10 years | 371,822 |  | 371,822 |  |
Total | 895,405 |  | 895,405 |  |
APS | Available for sale-fixed income securities | Other Special Use Funds |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Available for sale-fixed income securities | 369,957 |  | 369,957 |  | 369,055
APS | Available for sale-fixed income securities | Coal Reclamation Escrow Account |  |  |  |  |
Fair value of fixed income securities, summarized by contractual maturities |  |  |  |  |
Less than one year | 101,521 |  | 101,521 |  |
1 year – 5 years | 56,420 |  | 56,420 |  |
5 years – 10 years | 0 |  | 0 |  |
Greater than 10 years | 0 |  | 0 |  |
Total | 157,941 |  | 157,941 |  |
APS | Available for sale-fixed income securities | Active Union Employee Medical Account |  |  |  |  |
Fair value of fixed income securities, summarized by contractual maturities |  |  |  |  |
Less than one year | 39,940 |  | 39,940 |  |
1 year – 5 years | 155,655 |  | 155,655 |  |
5 years – 10 years | 16,421 |  | 16,421 |  |
Greater than 10 years | 0 |  | 0 |  |
Total | 212,016 |  | 212,016 |  |
APS | Other |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Other | 15,939 |  | 15,939 |  | (600)
Total Unrealized Gains |  |  | 481 |  | 0
Total Unrealized Losses |  |  | 0 |  | 0
APS | Other | Nuclear Decommissioning Trusts |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Other | 8,971 |  | 8,971 |  | (3,799)
APS | Other | Other Special Use Funds |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Other | 6,968 |  | 6,968 |  | $ 3,199
APS | Other | Other Special Use Funds | Pinnacle West Captive Insurance Cell |  |  |  |  |
Nuclear decommissioning trust fund assets |  |  |  |  |
Special use fund | $ 4,000 |  | $ 4,000 |  |

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