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Regulatory Matters Regulatory Matters - COVID-19 (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2020 | May 05, 2020 | Mar. 13, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Pre-tax income | $ 14,657,000 | $ 25,209,000 |  |  |
APS |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Pre-tax income | $ 20,770,000 | $ 34,602,000 |  |  |
Customer support fund |  |  |  |  | $ 1,500,000
Customer support fund, bill credit |  |  |  |  | $ 100
Subsequent Event | APS |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Demand side management funds |  |  |  | $ 36,000,000 |
Voluntary funds |  |  |  | $ 5,300,000 |
Minimum | Damage from Fire, Explosion or Other Hazard | Forecast | APS |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Pre-tax income |  |  | $ 20,000,000 |  |
Maximum | Damage from Fire, Explosion or Other Hazard | Forecast | APS |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |
Pre-tax income |  |  | $ 30,000,000 |  |

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