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Regulatory Matters - COVID-19 Pandemic (Details) - APS - USD ($) | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2022 | Jan. 21, 2021 | May 05, 2020
Public Utilities, General Disclosures [Line Items] |  |  |  |
Demand side management funds |  |  |  | $ 36,000,000
Customer credits |  | $ 43,000,000 |  |
Customer credits, additional funds |  | $ 7,000,000 |  |
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% |  |  |
Damage from Fire, Explosion or Other Hazard |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |
Past due balance threshold qualifying for payment extension |  |  | $ 75 |

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