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Regulatory Matters - Retail Rate Case Filing (Details) - ACC - ARIZONA PUBLIC SERVICE COMPANY |  |  |  |  |  |  |  | 12 Months Ended
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Oct. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Aug. 13, 2018 USD ($) | Feb. 13, 2018 | Jan. 08, 2018 USD ($) | Jan. 03, 2018 Customer | Mar. 27, 2017 USD ($) $ / kWh | Dec. 31, 2019 USD ($)
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Regulatory impact, operating results |  |  |  |  |  |  |  | $ (10,000,000)
Requested rate increase for tax act | $ 184,000,000 |  | $ (86,500,000) |  | $ (119,100,000) |  |  |
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% |
Approximate percentage of increase in average residential customer bill | 5.40% |  |  | 4.54% |  |  | 4.54% |
Rate matter, cost base rate |  | $ 8,870,000,000 |  |  |  |  |  |
Rate matter, funding limited income crisis bill program | $ 1,250,000 |  |  |  |  |  |  |
Settlement agreement, net retail base rate increase |  |  |  |  |  |  | $ 94,600,000 |
Settlement agreement, non-fuel, 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 |
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% |
Resource comparison proxy for exported energy (in dollars per kWh) | $ / kWh |  |  |  |  |  |  | 0.129 |
Number of customers which signed complaint | Customer |  |  |  |  |  | 25 |  |
AZ Sun II Program | Retail Rate Case Filing with Arizona Corporation Commission |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Minimum annual renewable energy standard and tariff |  |  |  |  |  |  | $ 10,000,000 |
Maximum annual renewable energy standard and tariff |  |  |  |  |  |  | $ 15,000,000 |
Minimum |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
Regulatory impact, operating results | $ 69,000,000 |  |  |  |  |  |  |
Minimum | Retail Rate Case Filing with Arizona Corporation Commission |  |  |  |  |  |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |
Environmental surcharge cap rate (in dollars per kWh) | $ / kWh |  |  |  |  |  |  | 0.00050 |

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