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Regulatory Matters - COVID-19 (Details) - APS - USD ($) |  | 1 Months Ended |
--- | --- | --- | ---
Jan. 21, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | May 05, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |
Percentage increase under PSA effective for first billing cycle beginning April 2021 |  | 50.00% |  |
Remaining percentage increase under PSA effective for first billing cycle beginning November 2021 |  | 50.00% |  |
Demand side management funds |  |  |  | $ 36,000,000
Customer credits |  | $ 43,000,000 |  |
Customer credits, additional funds |  | $ 7,000,000 |  |
Voluntary funds |  |  | $ 15,000,000 |
Customer COVID assistance |  |  | 12,400,000 |
Non-customer funds |  |  | 8,800,000 |
Bill credits for limited income customers |  |  | $ 3,600,000 |
Threshold percentage for deferral of potential recovery |  |  | 50.00% |
Threshold for deferral of potential recovery |  |  | $ 2,500,000 |
Customer support fund, bill credit |  |  | 100 |
Expanded credit for limited income customers |  |  | 300 |
Customer assistance, small customers, bill credit |  |  | 1,000 |
Additional bill credit for delinquent limited income customers |  |  | 250 |
Customer support fund, non-profits and community organizations |  |  | $ 2,700,000 |
Damage from Fire, Explosion or Other Hazard |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Customer support fund, payment period | 8 months |  |  |
Past due balance threshold qualifying for payment extension | $ 75 |  |  |

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