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Regulatory Matters - Cost Recovery Mechanisms (Details) - APS |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
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Sep. 01, 2026 $ / kWh | Jul. 31, 2026 USD ($) | Jun. 01, 2026 USD ($) | Nov. 26, 2025 $ / kWh | Aug. 14, 2025 $ / kWh | Jul. 31, 2025 USD ($) | Jun. 01, 2025 USD ($) | Nov. 27, 2024 $ / kWh | Aug. 13, 2024 $ / kWh | Jul. 31, 2024 USD ($) | Jun. 01, 2024 USD ($) MW | Oct. 11, 2023 | Jul. 01, 2023 USD ($) $ / KWH_Kilowatt_hour | Jun. 30, 2026 USD ($) $ / kWh | Dec. 31, 2022 USD ($) $ / kWh | Dec. 31, 2021 $ / kWh | Jul. 01, 2026 USD ($) | Dec. 03, 2025 USD ($) | Aug. 31, 2025 USD ($) | Jul. 01, 2025 USD ($) | Jun. 30, 2025 USD ($) | Apr. 22, 2025 USD ($) | Jul. 01, 2024 USD ($) | Nov. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | May 31, 2023 USD ($) | Nov. 30, 2022 USD ($) | Jul. 01, 2022 USD ($)
Damage from Fire, Explosion or Other Hazard |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Past due balance threshold qualifying for payment extension |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 75 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Arizona Renewable Energy Standard and Tariff | ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Plan term |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Arizona Renewable Energy Standard and Tariff 2018 | ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of proposed budget |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 110,100,000 |  |  | $ 92,700,000 |  | $ 95,100,000 |  |  | $ 86,200,000
Demand Side Management Adjustor Charge 2024 | ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of proposed budget |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 91,500,000 |  |  |  |
Approved rate, amount of customer refunds |  |  |  |  |  | $ 7,600,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,600,000 |  |  | $ 9,000,000 |  |  |  |  |  |
Rate matter, updated budget |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  |  | $ 90,900,000 |  |  |  |  |  |  |
Renewable Energy Adjustment Charge | ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Approved rate, amount of customer refunds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 44,200,000 |  |  | $ 43,000,000 |  |  |  |  |  |
Demand Side Management Adjustor Charge 2023 | ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of proposed budget |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 88,000,000 | $ 88,000,000 |
Power Supply Adjustor (PSA) | ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PSA rate (in dollars per kWh) | $ / kWh |  |  |  | 0.016977 |  |  |  | 0.013977 |  |  |  |  |  |  | 0.006 |  |  |  |  |  |  |  |  |  |  |  |  |
Reporting threshold of balancing account |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Overall approved PSA rate (in dollars per kWh) | $ / kWh |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.011977 |  |  |  |  |  |  |  |  |  |  |  |  |
Forward component of PSA rate (in dollars per kWh) | $ / kWh |  |  |  | 0.012457 |  |  |  | (0.000281) |  |  |  |  |  |  | (0.012624) |  |  |  |  |  |  |  |  |  |  |  |  |
Historical component of PSA rate (in dollars per kWh) | $ / kWh |  |  |  | 0.00452 |  |  |  | 0.008728 |  |  |  |  |  |  | 0.013071 |  |  |  |  |  |  |  |  |  |  |  |  |
Transition component of PSA rate | $ / kWh |  |  |  | 0 |  |  |  | 0.005530 |  |  |  |  |  |  | 0.011530 |  |  |  |  |  |  |  |  |  |  |  |  |
Power Supply Adjustor (PSA) | ACC | Cost Recovery Mechanisms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum increase decrease in PSA rate (in dollars per kWh) | $ / kWh |  |  |  | 0.006 |  |  |  | 0.006 |  |  |  |  |  | 0.006 |  |  |  |  |  |  |  |  |  |  |  |  |  |
PSA rate in prior years (in dollars per kWh) | $ / kWh |  |  |  | 0.003 |  |  |  | 0.002 |  |  |  |  |  |  |  | 0.004 |  |  |  |  |  |  |  |  |  |  |  |
Transmission rates, transmission cost adjustor and other transmission matters | FERC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate matters, increase (decrease) In cost recovery |  |  | $ 13,100,000 |  |  |  | $ 119,000,000.0 |  |  |  | $ 27,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate matters, increase (decrease) in cost recovery, wholesale customer rates |  |  | 1,500,000 |  |  |  | 4,600,000 |  |  |  | 16,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate matters, increase (decrease) in cost recovery, retail customer rates |  |  | 11,600,000 |  |  |  | 114,400,000 |  |  |  | 10,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate matters, increase (decrease) In retail revenue requirements |  |  | $ 20,600,000 |  |  |  | $ 88,300,000 |  |  |  | $ 8,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate matters, increase in residential and commercial rates (in MW) | MW |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate matters, decrease in commercial rates (in MW) | MW |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lost Fixed Cost Recovery Mechanism |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate matter cap percentage of retail revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of adjustment approved representing prorated sales losses pending approval |  |  |  |  |  | 60,100,000 |  |  |  | $ 49,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of adjustment representing annual recovery |  |  |  |  |  | $ 10,500,000 |  |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lost Fixed Cost Recovery Mechanism | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of adjustment approved representing prorated sales losses pending approval |  | $ 72,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of adjustment representing annual recovery |  | $ 12,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Court Resolution Surcharge | ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Court resolution surcharge (in dollars per kWh) | $ / KWH_Kilowatt_hour |  |  |  |  |  |  |  |  |  |  |  |  | 0.00175 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lost revenue recovery |  |  |  |  |  |  |  |  |  |  |  |  | $ 59,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lost revenue recovery collected |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Metering | ACC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate matters, cost of service, resource comparison proxy method, maximum annual percentage decrease |  |  |  |  | 10.00% |  |  |  | 10.00% |  |  | 10.00% |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-year export energy price (in dollars per kWh) | $ / kWh |  |  |  |  | 0.06171 |  |  |  | 0.06857 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate lock period |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net Metering | ACC | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rate matters, cost of service, resource comparison proxy method, maximum annual percentage decrease | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Third-year export energy price (in dollars per kWh) | $ / kWh | 0.05554 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2027 RES Implementation Plan | ACC | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of proposed budget |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 120,900,000 |  |  |  |  |  |  |  |  |  |  |

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