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Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Details) - Arizona Public Service Company - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Nuclear decommissioning trust fund assets |  |  |
Fair Value | $ 1,420,641 | $ 1,653,167 |
Total Unrealized Gains | 337,994 | 475,670 |
Total Unrealized Losses | (69,091) | (4,063) |
Amortized cost | 927,000 | 972,000 |
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds |  |  |
Realized gains | 9,437 | 134,659 | $ 12,370
Realized losses | (40,239) | (8,438) | (5,568)
Proceeds from the sale of securities | 1,207,197 | 1,720,966 | 819,519
Nuclear Decommissioning Trusts |  |  |
Nuclear decommissioning trust fund assets |  |  |
Fair Value | 1,073,410 | 1,294,757 |
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds |  |  |
Realized gains | 9,017 | 134,610 | 12,194
Realized losses | (40,239) | (8,431) | (5,553)
Proceeds from the sale of securities | 979,639 | 1,457,305 | 675,035
Other Special Use Funds |  |  |
Nuclear decommissioning trust fund assets |  |  |
Fair Value | 347,231 | 358,410 |
Realized gains and losses and proceeds from the sale of securities by the nuclear decommissioning trust funds |  |  |
Realized gains | 420 | 49 | 176
Realized losses | 0 | (7) | (15)
Proceeds from the sale of securities | 227,558 | 263,661 | $ 144,484
Equity securities |  |  |
Nuclear decommissioning trust fund assets |  |  |
Equity securities | 554,214 | 687,882 |
Total Unrealized Gains | 334,817 | 451,387 |
Total Unrealized Losses | (267) | 0 |
Equity securities | Nuclear Decommissioning Trusts |  |  |
Nuclear decommissioning trust fund assets |  |  |
Equity securities | 487,240 | 640,312 |
Equity securities | Other Special Use Funds |  |  |
Nuclear decommissioning trust fund assets |  |  |
Equity securities | 66,974 | 47,570 |
Available for sale-fixed income securities |  |  |
Nuclear decommissioning trust fund assets |  |  |
Fair Value | 861,637 | 992,131 |
Total Unrealized Gains | 3,177 | 24,283 |
Total Unrealized Losses | (68,795) | (4,063) |
Fair value of fixed income securities, summarized by contractual maturities |  |  |
Less than one year | 97,496 |  |
1 year – 5 years | 362,002 |  |
5 years – 10 years | 129,171 |  |
Greater than 10 years | 272,968 |  |
Total | 861,637 |  |
Available for sale-fixed income securities | Nuclear Decommissioning Trusts |  |  |
Nuclear decommissioning trust fund assets |  |  |
Fair Value | 582,343 | 682,227 |
Fair value of fixed income securities, summarized by contractual maturities |  |  |
Less than one year | 9,422 |  |
1 year – 5 years | 181,640 |  |
5 years – 10 years | 122,340 |  |
Greater than 10 years | 268,941 |  |
Total | 582,343 |  |
Available for sale-fixed income securities | Other Special Use Funds |  |  |
Nuclear decommissioning trust fund assets |  |  |
Fair Value | 279,294 | 309,904 |
Available for sale-fixed income securities | Coal Reclamation Escrow Account |  |  |
Fair value of fixed income securities, summarized by contractual maturities |  |  |
Less than one year | 49,917 |  |
1 year – 5 years | 36,484 |  |
5 years – 10 years | 0 |  |
Greater than 10 years | 4,027 |  |
Total | 90,428 |  |
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 | 38,157 |  |
1 year – 5 years | 143,878 |  |
5 years – 10 years | 6,831 |  |
Greater than 10 years | 0 |  |
Total | 188,866 |  |
Other |  |  |
Nuclear decommissioning trust fund assets |  |  |
Fair Value | 4,790 | (26,846) |
Total Unrealized Gains | 0 | 0 |
Total Unrealized Losses | (29) | 0 |
Other | Nuclear Decommissioning Trusts |  |  |
Nuclear decommissioning trust fund assets |  |  |
Fair Value | 3,827 | (27,782) |
Other | Other Special Use Funds |  |  |
Nuclear decommissioning trust fund assets |  |  |
Fair Value | $ 963 | $ 936 |

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