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Regulatory Matters - ACC General Retail Rate Cases (Details) $ in Millions | May 11, 2026 USD ($) | May 01, 2026 USD ($) | Apr. 03, 2026 USD ($) | Mar. 18, 2026 USD ($) | Mar. 02, 2026 USD ($) | Jun. 13, 2025 USD ($) $ / KWH_Kilowatt_hour | Feb. 22, 2024 USD ($) | Apr. 02, 2026
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Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  | $ 506.5 |  | $ 525.2 |  |  |  |
Increment of fair value rate, percentage |  |  |  |  | 0.00% |  |  |
Requested period of post-test year plant |  |  |  | 12 months |  |  |  |
Requested increase (decrease) in deadband |  | 0.0050 |  |  |  |  |  |
Approved rate increase (decrease), amount |  |  |  |  |  |  | $ 491.7 |
Minimum |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 200.2 |  |  |
Requested return on equity, percentage |  |  |  | 9.55% | 9.00% |  |  |
Requested period of post-test year plant |  |  |  |  | 0 months |  |  |
Maximum |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  | $ 278.1 |  |  |
Requested return on equity, percentage |  |  |  | 9.80% | 9.20% |  |  |
Requested period of post-test year plant |  |  |  |  | 12 months |  |  |
APS |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount | $ 691.6 |  | $ 694.2 |  |  |  |  |
Requested return on equity, percentage |  |  | 10.70% |  |  |  |  |
Increment of fair value rate, percentage |  |  | 0.90% |  |  |  |  | 1.00%
Requested period of post-test year plant |  |  | 12 months |  |  |  |  |
Requested net revenue requirement increase (decrease), amount | $ 608.7 |  | $ 611.3 |  |  |  |  |
Requested increase (decrease) in deadband |  |  | 0.0040 |  |  |  |  |
Requested projected plant duration |  |  | 6 months |  |  |  |  |
Requested review and challenge period |  |  | 120 days |  |  |  |  |
ACC |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Increment of fair value rate, percentage |  |  |  | 0.20% |  |  | 0.25% |
Approved return on equity, percentage |  |  |  |  |  |  | 9.55% |
ACC | APS |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), amount |  |  |  |  |  | $ 579.5 |  |
Total revenue deficiency |  |  |  |  |  | $ 662.4 |  |
ACC | APS | Rate Case Filing with Arizona Corporation Commission |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Requested rate increase (decrease), percentage |  |  |  |  |  | 13.99% |  |
Public utilities, test period |  |  |  |  |  | 12 months |  |
Rate matter, cost base rate |  |  |  |  |  | $ 12,500.0 |  |
Effective fair value percentage |  |  |  |  |  |  | 4.39% |
ACC | ACC | Rate Case Filing with Arizona Corporation Commission |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Base fuel and purchased power costs rate (in dollars per kWh) | $ / KWH_Kilowatt_hour |  |  |  |  |  | 0.043881 |  |

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