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Regulatory Matters Regulatory Matters - COVID-19 (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2020 | May 05, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Pre-tax income | $ 239,520,000 | $ 166,099,000 | $ 254,177,000 | $ 191,308,000 |  |
Customer support, not yet assigned | 3,000,000 |  | 3,000,000 |  |  |
APS |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |
Pre-tax income | 245,669,000 | $ 173,513,000 | 266,439,000 | $ 208,115,000 |  |
Customer support fund |  |  |  |  |  | $ 1,500,000
Customer support fund, bill credit |  |  |  |  |  | 100
Demand side management funds |  |  |  |  |  | 36,000,000
Customer credits | 40,000,000 |  | 40,000,000 |  |  |
Customer credits, additional funds | 4,000,000 |  | 4,000,000 |  |  |
Voluntary funds | $ 8,000,000 |  | $ 8,000,000 |  |  | 5,300,000
Customer assistance, small customers |  |  |  |  |  | 2,300,000
Customer assistance, small customers, bill credit |  |  |  |  |  | 1,000
Customer support fund, non-profits and community organizations |  |  |  |  |  | $ 1,250,000
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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