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Commitments and Contingencies - Palo Verde Nuclear Generating Station, Contractual Obligations and Super-Fund Related Matters (Details) $ in Thousands |  |  |  |  | 12 Months Ended | 108 Months Ended
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Nov. 01, 2021 USD ($) claim | Apr. 05, 2018 plaintiff Defendant | Dec. 16, 2016 plaintiff | Aug. 06, 2013 Defendant | Dec. 31, 2021 USD ($) Trust | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) claim timePeriod
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |  |
Total take-or-pay commitments |  |  |  |  | $ 174,616 | $ 170,097 |  |
Arizona Public Service Company |  |  |  |  |  |  |  |
Palo Verde Nuclear Generating Station [Abstract] |  |  |  |  |  |  |  |
Maximum insurance against public liability per occurrence for a nuclear incident |  |  |  |  | 13,500,000 |  |  |
Maximum available nuclear liability insurance |  |  |  |  | 450,000 |  |  |
Remaining nuclear liability insurance through mandatory industry wide retrospective assessment program |  |  |  |  | 13,100,000 |  |  |
Maximum assessment per reactor for each nuclear incident |  |  |  |  | 137,600 |  |  |
Annual limit per incident with respect to maximum assessment |  |  |  |  | $ 20,500 |  |  |
Number of VIE lessor trusts | Trust |  |  |  |  | 3 |  |  |
Maximum potential retrospective assessment per incident of APS |  |  |  |  | $ 120,100 |  |  |
Annual payment limitation with respect to maximum potential retrospective assessment |  |  |  |  | 17,900 |  |  |
Amount of "all risk" (including nuclear hazards) insurance for property damage to, and decontamination of, property at Palo Verde |  |  |  |  | 2,800,000 |  |  |
Request second-year energy price for exported energy |  |  |  |  | 22,400 |  |  |
Collateral assurance based on rating triggers |  |  |  |  | $ 63,300 |  |  |
Period to provide collateral assurance based on rating triggers |  |  |  |  | 20 days |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |  |
2022 |  |  |  |  | $ 1,000,000 |  |  |
2023 |  |  |  |  | 765,000 |  |  |
2024 |  |  |  |  | 703,000 |  |  |
2025 |  |  |  |  | 686,000 |  |  |
2026 |  |  |  |  | 687,000 |  |  |
Thereafter |  |  |  |  | 6,900,000 |  |  |
Total take-or-pay commitments |  |  |  |  | 174,616 | 170,097 |  |
Arizona Public Service Company | Coal Take-or-Pay Commitments |  |  |  |  |  |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |  |
2022 |  |  |  |  | 202,917 |  |  |
2023 |  |  |  |  | 201,826 |  |  |
2024 |  |  |  |  | 203,638 |  |  |
2025 |  |  |  |  | 194,192 |  |  |
2026 |  |  |  |  | 195,121 |  |  |
Thereafter |  |  |  |  | 925,644 |  |  |
Total take-or-pay commitments |  |  |  |  | 1,900,000 |  |  |
Present value of commitments |  |  |  |  | 1,500,000 |  |  |
Total purchases |  |  |  |  | 219,958 | 189,817 | $ 204,888 |
Arizona Public Service Company | Renewable Energy Credits |  |  |  |  |  |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |  |
2022 |  |  |  |  | 32,000 |  |  |
2023 |  |  |  |  | 30,000 |  |  |
2024 |  |  |  |  | 29,000 |  |  |
2025 |  |  |  |  | 26,000 |  |  |
2026 |  |  |  |  | 22,000 |  |  |
Thereafter |  |  |  |  | 87,000 |  |  |
Arizona Public Service Company | Coal Mine Reclamation Obligations |  |  |  |  |  |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |  |
2022 |  |  |  |  | 17,000 |  |  |
2023 |  |  |  |  | 18,000 |  |  |
2024 |  |  |  |  | 19,000 |  |  |
2025 |  |  |  |  | 20,000 |  |  |
2026 |  |  |  |  | 21,000 |  |  |
Thereafter |  |  |  |  | 48,000 |  |  |
Arizona Public Service Company | Coal Mine Reclamation Balance Sheet Obligations |  |  |  |  |  |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |  |
Total take-or-pay commitments |  |  |  |  | 175,000 | $ 170,000 |  |
Arizona Public Service Company | Contaminated Groundwater Wells |  |  |  |  |  |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |  |
Costs related to investigation and study under Superfund site |  |  |  |  | $ 3,000 |  |  |
Number of defendants against whom Roosevelt Irrigation District ("RID") filed lawsuit | Defendant |  | 28 |  | 24 |  |  |  |
Number of plaintiffs | plaintiff |  |  | 2 |  |  |  |  |
Arizona Public Service Company | Contaminated Groundwater Wells | Settled Litigation |  |  |  |  |  |  |  |
Fuel and Purchased Power Commitments and Purchase Obligations [Abstract] |  |  |  |  |  |  |  |
Number of plaintiffs | plaintiff |  | 2 |  |  |  |  |  |
Arizona Public Service Company and Palo Verde Owners vs. United States Department of Energy - Spent Nuclear Fuel and Waste Disposal |  |  |  |  |  |  |  |
Palo Verde Nuclear Generating Station [Abstract] |  |  |  |  |  |  |  |
Settlement amount, awarded to company | $ 12,200 |  |  |  |  |  |  | $ 111,800
Arizona Public Service Company and Palo Verde Owners vs. United States Department of Energy - Spent Nuclear Fuel and Waste Disposal | Arizona Public Service Company |  |  |  |  |  |  |  |
Palo Verde Nuclear Generating Station [Abstract] |  |  |  |  |  |  |  |
Gain contingency, new claims filed, number | claim | 8 |  |  |  |  |  |  | 7
Gain contingency, number of separate time periods | timePeriod |  |  |  |  |  |  |  | 7
Settlement amount, awarded to company | $ 3,600 |  |  |  |  |  |  | $ 32,500

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