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Regulatory Matters - Retail Rate Case Filing (Details) - ACC - APS | Oct. 31, 2019 USD ($) GW | Jun. 30, 2019 USD ($) | Mar. 27, 2017 USD ($) $ / kWh
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Retail Rate Case Filing with Arizona Corporation Commission |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Base rate decrease, elimination of tax expense adjustment mechanism | $ 115,000,000 |  |
Approximate percentage of increase in average customer bill | 5.60% |  | 3.28%
Rate matter, cost base rate |  | $ 8,870,000,000 |
Net retail base rate, increase |  |  | $ 94,600,000
Non-fuel and non-depreciation base rate, increase |  |  | 87,200,000
Fuel-related base rate decrease |  |  | 53,600,000
Base rate increase, changes in depreciation schedules |  |  | $ 61,000,000.0
Approximate percentage of increase in average residential customer bill | 5.40% |  | 4.54%
Authorized return on common equity (as a percent) |  |  | 10.00%
Percentage of debt in capital structure |  |  | 44.20%
Percentage of common equity in capital structure |  |  | 55.80%
Rate matter, resource comparison proxy for exported energy (in dollars per kWh) | $ / kWh |  |  | 0.129
Funding limited income crisis bill program | $ 1,250,000 |  |
Commercial customers, market pricing, threshold | GW | 0.2 |  |
AZ Sun Program Phase 2 | Retail Rate Case Filing with Arizona Corporation Commission |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public utilities, minimum annual renewable energy standard and tariff |  |  | $ 10,000,000
Public utilities, maximum annual renewable energy standard and tariff |  |  | $ 15,000,000
Minimum |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Operating Results | $ 69,000,000 |  |
Minimum | Retail Rate Case Filing with Arizona Corporation Commission |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Rate matter, environmental surcharge cap rate (in dollars per kWh) | $ / kWh |  |  | 0.00016
Maximum | Retail Rate Case Filing with Arizona Corporation Commission |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Rate matter, environmental surcharge cap rate (in dollars per kWh) | $ / kWh |  |  | 0.00050

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